# WisBlock-API V2[![Build Status](https://github.com/beegee-tokyo/WisBlock-API-V2/workflows/RAK%20Library%20Build%20CI/badge.svg)](https://github.com/beegee-tokyo/WisBlock-API-V2/actions)

| <center><img src="./assets/rakstar.jpg" alt="RAKstar" width=50%></center>  | <center><img src="./assets/RAK-Whirls.png" alt="RAKWireless" width=50%></center> | <center><img src="./assets/WisBlock.png" alt="WisBlock" width=50%></center> | <center><img src="./assets/Yin_yang-48x48.png" alt="BeeGee" width=50%></center>  | <center><img src="./assets/RUI3.png" alt="BeeGee"></center>  |
| -- | -- | -- | -- | -- |

----

Targeting low power consumption, this Arduino library for RAKwireless WisBlock Core modules takes care of all the LoRa P2P, LoRaWAN, BLE, AT command functionality. You can concentrate on your application and leave the rest to the API. It is made as a companion to the [SX126x-Arduino LoRaWAN library](https://github.com/beegee-tokyo/SX126x-Arduino) :arrow_upper_right:    
It requires some rethinking about Arduino applications, because you have no `setup()` or `loop()` function. Instead everything is event driven. The MCU is sleeping until it needs to take actions. This can be a LoRaWAN event, an AT command received over the USB port or an application event, e.g. an interrupt coming from a sensor. 

This approach makes it easy to create applications designed for low power usage. During sleep the WisBlock Base + WisBlock Core RAK4631 consume only 40uA.

In addition the API offers two options to setup LoRa P2P / LoRaWAN settings without the need to hard-code them into the source codes.    
- AT Commands => [AT-Command Manual](https://docs.rakwireless.com/RUI3/Serial-Operating-Modes/AT-Command-Manual/https://docs.rakwireless.com/RUI3/Serial-Operating-Modes/AT-Command-Manual/) ↗️
- WisToolBox ==> [WisToolbox](https://docs.rakwireless.com/Product-Categories/Software-Tools/WisToolBox) ↗️

# ⚠️ _**IMPORTANT:**_
_**V2 of the library changed the AT command format to be compatible with RUI3 AT commands. Please check the AT command manual for RUI3 for differences.**_

_**V2 release supports only the [RAKwireless WisBlock RAK4631 Core Module](https://docs.rakwireless.com/Product-Categories/WisBlock/RAK4631/Overview)**_ ↗️ 

_**Support for the RAK11310 and RAK1200 might be added in the future**_

----

# Content
* [How does it work?](#how-does-it-work)
	* [Block diagram of the API and application part](#block-diagram-of-the-api-and-application-part)
	* [AT Command format](#at-command-format)
	* [Extend AT command interface](#extend-at-command-interface)
	* [Available examples](#available-examples)
	* [Firmware update over BLE](#firmware-update-over-ble)
* [API functions](#api-functions)
	* [Set the application version](#set-the-application-version)
	* [Set hardcoded LoRaWAN credentials](#set-hardcoded-lorawan-credentials)
	* [Reset WisBlock Core module](#reset-wisblock-core-module)
	* [Wake up loop](#wake-up-loop)
	* [Print settings to log output](#print-settings-to-log-output)
	* [Stop application wakeup timer](#stop-application-wakeup-timer)
	* [Restart application timer with a new value](#restart-application-timer-with-a-new-value)    
	* [Send data over BLE UART](#send-data-over-ble-uart)
	* [Restart BLE advertising](#restart-ble-advertising)
	* [Send data over LoRaWAN](#send-data-over-lorawan)
	* [Check result of LoRaWAN transmission](#check-result-of-lorawan-transmission)
	* [Trigger custom events](#trigger-custom-events)
		* [Event trigger definition](#event-trigger-definition)
		* [Example for a custom event using the signal of a PIR sensor to wake up the device](#example-for-a-custom-event-using-the-signal-of-a-pir-sensor-to-wake-up-the-device)
* [Cayenne LPP packet decoding](#cayenne-lpp-packet-decoding)
	* [Usage of the WisBlock Extended Cayenne LPP data types](#usage-of-the-wisblock-extended-cayenne-lpp-data-types)
	* [Data types and channel numbers used with WisBlock API V2](#data-types-and-channel-numbers-used-with-wisblock-api-v2)
* [Simple code example of the user application](#simple-code-example-of-the-user-application)
	* [Includes and definitions](#includes-and-definitions)
	* [setup_app()](#setup-app)
	* [init_app()](#init-app)
	* [app_event_handler()](#app-event-handler)
	* [ble_data_handler()](#ble-data-handler)
	* [lora_data_handler()](#lora-data-handler)
		* [1 LORA_DATA](#1-lora-data)
		* [2 LORA_TX_FIN](#2-lora-tx-fin)
		* [3 LORA_JOIN_FIN](#3-lora-join-fin)
* [Debug and Powersave Settings](#debug-and-powersave-settings)
* [License](#license)
* [Changelog](#changelog)

----

# How does it work?

The API is handling everything from **`setup()`**, **`loop()`**, LoRaWAN initialization, LoRaWAN events handling, BLE initialization, BLE events handling to the AT command interface.    

📝 _**REMARK!**_    
The user application **MUST NOT** have the functions **`setup()`** and **`loop()`**!    

The user application has two initialization functions, one is called at the beginning of **`setup()`**, the other one at the very end. The other functions are event callbacks that are called from **`loop()`**. It is possible to define custom events (like interrupts from a sensor) as well. 

Sensor reading, actuator control or other application tasks are handled in the **`app_event_handler()`**. **`app_event_handler()`** is called frequently, the time between calls is defined by the application. In addition **`app_event_handler()`** is called on custom events.

**`ble_data_handler()`** is called on BLE events (BLE UART RX events for now) from **`loop()`**. It can be used to implement custom communication over BLE UART.

📝 **REMARK!**    
This function is not required on the RAK11310!    

**`lora_data_handler()`** is called on different LoRaWAN events    
- A download packet has arrived from the LoRaWAN server
- A LoRaWAN transmission has been finished
- Join Accept or Join Failed

----

## Flow
```mermaid
graph TD
A[Boot] -->|Startup| B(setup)
    B --> |1| D(setup_app)
        D --> B(setup)
    B --> |2| E[Initialize LoRa and BLE]
        E --> B(setup)
    B --> |3| G(init_app)
        G --> K(setup finished)
    K --> | Start loop| I(loop)
        Q[LoRa Event] --> |Wake up| J
        O[Sensor Event] --> |Wake up| J    
        P[BLE Event] --> |Wake up| J   
        R[AT command] --> |Wake up| J   
        T[Timer] --> |Wake up| J   
        I --> J(sleeping)
        K -->  | Start timer | T
        J --> L(app_event_handler)
        J --> M(lora_data_handler)
        J --> N(ble_data_handler)
        J --> S(AT Command handler)
        L --> U(read sensors)
        M --> V(join, tx and rx events)
        N --> W(handle BLE AT commands)
        S --> AA(user AT commands)
        U --> L
        V --> M
        W --> N
        AA --> S
        L --> J
        M --> J
        N --> J
        S --> J
```

----

## Block diagram of the API and application part
![Block diagram](./assets/Structure.png)    

----

## AT Command format
All AT commands can be found in the [AT-Command Manual](https://docs.rakwireless.com/RUI3/Serial-Operating-Modes/AT-Command-Manual/https://docs.rakwireless.com/RUI3/Serial-Operating-Modes/AT-Command-Manual/) _**Not all RUI3 AT commands are supported. A list of available AT commands can be retrieved with AT? from the device**_ ↗️

Two custom AT commands have been added to the default RUI3 AT command set:    

## ATC+SENDINT

Description: Set the automatic transmission interval

This command allows to set the interval in seconds between automatic packet transmissions. If set to 0, automatic packet transmission is disabled.

| Command                    | Input Parameter | Return Value                                                  | Return Code              |
| -------------------------- | --------------- | ------------------------------------------------------------- | ------------------------ |
| ATC+SENDINT?                    | -               | `ATC+SENDINT: "Get or Set the automatic send interval` | `OK`                     |
| ATC+SENDINT=?                   | -               | `<interval in seconds>`                                                    | `OK`                     |
| ATC+SENDINT=`<Input Parameter>` | `<interval in seconds>`      | -                                                             | `OK` or `AT_PARAM_ERROR` |

**Examples**:

```
ATC+SENDINT?

ATC+SENDINT: Get or Set the automatic send interval 
OK

ATC+SENDINT=?

ATC+SENDINT:60
OK

ATC+SENDINT=60

OK
```

## ATC+STATUS

Description: Show device status

This command allows the user to get the current device status.

| Command                    | Input Parameter | Return Value                              | Return Code |
| -------------------------- | --------------- | ----------------------------------------- | ----------- |
| ATC+STATUS?                    | -               | `ATC+STATUS: Show LoRaWAN status` | `OK`        |
| ATC+STATUS=? | -               | *< status   >*                        | `OK`        |

**Examples**:

```
ATC+STATUS?

ATC+STATUS: Show LoRaWAN status
OK

// When in LoRaWAN mode:

ATC+STATUS=?
Device status:
   RAK4631
   Mode LPWAN
   Auto join enabled
   Network joined
LPWAN status:
   Dev EUI AC1F09FFFE09016C
   App EUI 70B3D57ED00201E1
   App Key 2B84E0B09B68E5CB42176FE753DCEE79
   Dev Addr 26021FB4
   NWS Key 323D155A000DF335307A16DA0C9DF53F
   Apps Key 3F6A66459D5EDCA63CBC4619CD61A11E
   OTAA enabled
   ADR disabled
   Public Network
   Dutycycle disabled
   Join trials 5
   TX Power 0
   DR 3
   Class 0
   Subband 1
   Fport 2
   Unconfirmed Message
   Region AS923-3
   Send Frequency 300

// When in LoRa P2P mode:

ATC+STATUS=?
Device status:
   RAK4631
   Mode P2P
   P2P frequency 916000000
   P2P TX Power 22
   P2P BW 125
   P2P SF 7
   P2P CR 0
   P2P Preamble length 8
   P2P Symbol Timeout 0
   Send Frequency 300

```

----

## ATC+PORT

Description: Port settings

This command allows the user to access and configure port settings.

| Command                     | Input Parameter    | Return Value                              | Return Code            |
| --------------------------- | ------------------ | ----------------------------------------- | ---------------------- |
| ATC+PORT?                    | -                  | `AT+PORT=<Port><CR>. Get or Set the Port` | `OK`                   |
| ATC+PORT=?                   | -                  | 1-223                                     | OK                     |
| ATC+PORT=`<Input Parameter>` | 1-223              | -                                         | OK *or* AT_PARAM_ERROR |

**Examples**:

```
ATC+PORT?

ATC+PORT: Get or Set the Port=[1..223]
OK

ATC+PORT=?

ATC+PORT:2
OK

ATC+PORT=2

OK
```

[Back](#content)    

----

## Extend AT command interface
Starting with WisBlock API V1.1.2 the AT Commands can be extended by user defined AT Commands. This new implementation uses the parser function of the WisBlock API AT command function. In addition, custom AT commands will be listed if the **`AT?`** is used.    

📝 _**REMARK!**_ 
In RUI3 custom AT commands are called with _**ATC**_ instead of _**AT**_!     

To extend the AT commands, three steps are required:    

### 1) Definition of the custom AT commands
The custom AT commands are listed in an array with the struct atcmd_t format. Each entry consist of the AT command, the explanation text that is shown when the command is called with a ? and pointers to the functions for query, execute with parameters and execute without parameters. Here is an example for two custom AT commands:    
```cpp
atcmd_t g_user_at_cmd_list_example[] = {
	/*|    CMD    |     AT+CMD?      |    AT+CMD=?    |  AT+CMD=value |  AT+CMD  |  Permissions  |*/
	// GNSS commands
	{"+SETVAL", "Get/Set custom variable", at_query_value, at_exec_value, NULL, "RW"},
	{"+LIST", "Show last packet content", at_query_packet, NULL, NULL, "R"},
};

atcmd_t *g_user_at_cmd_list = g_user_at_cmd_list_example;
```
📝 **REMARK 1**    
The structure for custom AT commands is extended for RUI3 compatibility. Older code written for WisBlock-API V1.x needs to be adjusted to this new structure.        
📝 **REMARK 2**    
For functions that are not supported by the AT command a **`NULL`** must be put into the array.    
📝 **REMARK 3**    
The name **`g_user_at_cmd_list`** is fixed and cannot be changed or the custom commands are not detected.    
📝 **REMARK 4**     
The permissions are given as a string. Valid entries are "R" (read only), "W" (write only), "RW" (read and write)    

### 2) Definition of the number of custom AT commands
A variable with the number of custom AT commands must be provided:
```cpp
/** Number of user defined AT commands */
uint8_t g_user_at_cmd_num = sizeof(g_user_at_cmd_list_example) / sizeof(atcmd_t);
```
📝 **REMARK**    
The name **`g_user_at_cmd_num`** is fixed and cannot be changed or the custom commands are not detected.

### 3) The functions for query and execute
For each custom command the query and execute commands must be written. The names of these functions must match 
the function names used in the array of custom AT commands. The execute command receives as a parameter the value of the AT command after the **`=`** of the value. 

Query functions (**`=?`**) do not receive and parameters and must always return with 0. Query functions save the result of the query in the global char array **`g_at_query_buffer`**, the array has a max size of **`ATQUERY_SIZE`** which is 128 characters.

Execute functions with parameters (**`=<value>`**) receive values or settings as a pointer to an char array. This array includes only the value or parameter without the AT command itself. For example the execute function handling **`ATC+SETDEV=12000`** would receive only the **`120000`**. The received value or parameter must be checked for validity and if the value of format is not matching, an **`AT_ERRNO_PARA_VAL`** must be returned. If the value or parameter is correct, the function should return **`0`**.

Execute functions without parameters are used to perform an action and return the success of the action as either **`0`** if successfull or  **`AT_ERRNO_EXEC_FAIL`** if the execution failed.

### Example
This examples is used to set a variable in the application.

```c++
/*********************************************************************/
// Example AT command to change the value of the variable new_val:
// Query the value AT+SETVAL=?
// Set the value AT+SETVAL=120000
// Second AT command to show last packet content
// Query with AT+LIST=?
/*********************************************************************/
int32_t new_val = 3000;

/**
 * @brief Returns the current value of the custom variable
 * 
 * @return int always 0
 */
static int at_query_value()
{
	snprintf(g_at_query_buf, ATQUERY_SIZE, "Custom Value: %d", new_val);
	return 0;
}

/**
 * @brief Command to set the custom variable
 * 
 * @param str the new value for the variable without the AT part
 * @return int 0 if the command was succesfull, 5 if the parameter was wrong
 */
static int at_exec_value(char *str)
{
	new_val = strtol(str, NULL, 0);
	MYLOG("APP", "Value number >>%ld<<", new_val);
	return 0;
}

/**
 * @brief Example how to show the last LoRa packet content
 * 
 * @return int always 0
 */
static int at_query_packet()
{
	snprintf(g_at_query_buf, ATQUERY_SIZE, "Packet: %02X%02X%02X%02X",
			 g_lpwan_data.data_flag1,
			 g_lpwan_data.data_flag2,
			 g_lpwan_data.batt_1,
			 g_lpwan_data.batt_2);
	return 0;
}

/**
 * @brief List of all available commands with short help and pointer to functions
 * 
 */
atcmd_t g_user_at_cmd_list_example[] = {
	/*|    CMD    |     AT+CMD?      |    AT+CMD=?    |  AT+CMD=value |  AT+CMD  |  Permission  |*/
	// GNSS commands
	{"+SETVAL", "Get/Set custom variable", at_query_value, at_exec_value, NULL, "RW"},
	{"+LIST", "Show last packet content", at_query_packet, NULL, NULL, "R"},
};

atcmd_t *g_user_at_cmd_list = g_user_at_cmd_list_example;

/** Number of user defined AT commands */
uint8_t g_user_at_cmd_num = sizeof(g_user_at_cmd_list_example) / sizeof(atcmd_t);
```

----

## Available examples

- [API Test](./examples/api-test) is a very basic example that sends a dummy message over LoRaWAN
- [Environment Sensor](./examples/environment) shows how to use the frequent wake up call to read sensor data from a RAK1906
- [Accelerometer Sensor](./examples/accel) shows how to use an external interrupt to create a wake-up event.
- [WisBlock Kit 2 GNSS tracker](./examples/WisBlock-Kit-2) is a LPWAN GNSS tracker application for the [WisBlock Kit2](https://store.rakwireless.com/collections/kits-bundles/products/wisblock-kit-2-lora-based-gps-tracker-with-solar-panel) :arrow_upper_right:    
- [LoRa P2P](./examples/LoRa-P2P) is a simple LoRa P2P example using the WisBlock API    

These five examples explain the usage of the API. In all examples the API callbacks and the additional functions (sensor readings, IRQ handling, GNSS location service) are separated into their own sketches.    
- The simplest example (_**api-test.ino**_) just sends a 3 byte packet with the values 0x10, 0x00, 0x00.    
- The other examples send their data encoded in the same format as RAKwireless WisNode devices. An explanation of the data format can be found in the RAKwireless [Documentation Center](https://docs.rakwireless.com/Product-Categories/WisTrio/RAK7205-5205/Quickstart/#decoding-sensor-data-on-chirpstack-and-ttn) :arrow_upper_right:. A ready to use packet decoder can be found in the RAKwireless Github repos in [RUI_LoRa_node_payload_decoder](https://github.com/RAKWireless/RUI_LoRa_node_payload_decoder) :arrow_upper_right:
- The LoRa P2P example (_**LoRa-P2P.ino**_) listens for P2P packets and displays them in the log.    

_**The WisBlock-API-V2 has been used as well in the following PlatformIO projects:**_
- _**[RAK4631-Kit-4-RAK1906](https://github.com/beegee-tokyo/RAK4631-Kit-4-RAK1906) :arrow_upper_right: Environment sensor application for the [WisBlock Kit 4](https://store.rakwireless.com/collections/kits-bundles/products/wisblock-kit-4-air-quality-monitor)**_ :arrow_upper_right:
- _**[RAK4631-Kit-2-RAK1910-RAK1904-RAK1906](https://github.com/beegee-tokyo/RAK4631-Kit-2-RAK1910-RAK1904-RAK1906) :arrow_upper_right: LPWAN GNSS tracker application for the [WisBlock Kit 2](https://store.rakwireless.com/collections/kits-bundles/products/wisblock-kit-2-lora-based-gps-tracker-with-solar-panel)**_ :arrow_upper_right:
- _**[RAK4631-Kit-2-RAK12500-RAK1906](https://github.com/beegee-tokyo/RAK4631-Kit-2-RAK12500-RAK1906) :arrow_upper_right: LPWAN GNSS tracker application using the [RAK12500](https://store.rakwireless.com/products/wisblock-gnss-location-module-rak12500)**_ :arrow_upper_right:
- _**[WisBlock-Sensor-For-LoRaWAN](https://github.com/beegee-tokyo/WisBlock-Sensor-For-LoRaWAN) :arrow_upper_right: My test application that supports many WisBlock I2C modules. It scans the I2C bus for connected modules and adapts its function and the payload to the found modules.

----

## Firmware update over BLE

When used with the RAK4631, firmware update over BLE is already included in the library. Firmware updates for the RAK4631 can be done by using the Nordic nRF Toolbox (available for Android and iOS) or with the WisBlock Toolbox (my Android application).    
For the update, copy the created update file (usually called firmware.zip) from the .pio/build/{device} folder, copy it to you phone and use one of the applications to update the firmware.

#### 📝 _INFO_    
If the firmware update via BLE fails, update the device to the latest bootloader for the RAK4631 with the version V0.4.3. You can find the latest bootloader in the [WisBlock repo](https://github.com/RAKWireless/WisBlock/tree/master/bootloader/RAK4630/Latest)     

----

# API functions
The API provides some calls for management, to send LoRaWAN packet, to send BLE UART data and to trigger events.

----
## Set the application version
**`void api_set_version(uint16_t sw_1 = 1, uint16_t sw_2 = 0, uint16_t sw_3 = 0);`**    
This function can be called to set the application version. The application version can be requested by AT commands.
The version number is build from three digits:    
**`sw_1`** ==> major version increase on API change / not backwards compatible    
**`sw_2`** ==> minor version increase on API change / backward compatible    
**`sw_3`** ==> patch version increase on bugfix, no affect on API     
If **`api_set_version`** is not called, the application version defaults to **`1.0.0`**.    

----

## Reset WisBlock Core module
**`void api_reset(void);`**    
Performs a reset of the WisBlock Core module

----

## Wake up loop
**`void api_wake_loop(uint16_t reason);`**    
This is used to wakeup the loop with an event. The **`reason`** must be defined in **`app.h`**. After the loop woke app, it will call the **`app_event_handler()`** with the value of **`reason`** in **`g_task_event_type`**.

As an example, this can be used to wakeup the device from the interrupt of an accelerometer sensor. Here as an example an extract from the **`accelerometer`** example code.

In **`accelerometer.ino`** the event is defined. The first define is to set the signal, the second is to clear the event after it was handled.
```c++
/** Define additional events */
#define ACC_TRIGGER 0b1000000000000000
#define N_ACC_TRIGGER 0b0111111111111111
```
Then in **`lis3dh_acc.ino`** in the interrupt callback function **`void acc_int_handler(void)`** the loop is woke up with the signal **`ACC_TRIGGER`**
```c++
void acc_int_handler(void)
{
	// Wake up the task to handle it
	api_wake_loop(ACC_TRIGGER);
}
```
And finally in **`accelerometer.ino`** the event is handled in **`app_event_handler()`**
```c++
	// ACC triggered event
	if ((g_task_event_type & ACC_TRIGGER) == ACC_TRIGGER)
	{
		g_task_event_type &= N_ACC_TRIGGER;
		MYLOG("APP", "ACC IRQ wakeup");
		// Reset ACC IRQ register
		get_acc_int();

		// Set Status flag, it will trigger sending a packet
		g_task_event_type = STATUS;
	}
```

----

## Print settings to log output
**`void api_log_settings(void);`**    
This function can be called to list the complete settings of the WisBlock device over USB. The output looks like:
```txt
Device status:
   RAK11310
   Auto join enabled
   Mode LPWAN
   Network joined
   Send Frequency 120
LPWAN status:
   Dev EUI AC1F09FFFE0142C8
   App EUI 70B3D57ED00201E1
   App Key 2B84E0B09B68E5CB42176FE753DCEE79
   Dev Addr 26021FB4
   NWS Key 323D155A000DF335307A16DA0C9DF53F
   Apps Key 3F6A66459D5EDCA63CBC4619CD61A11E
   OTAA enabled
   ADR disabled
   Public Network
   Dutycycle disabled
   Join trials 30
   TX Power 0
   DR 3
   Class 0
   Subband 1
   Fport 2
   Unconfirmed Message
   Region AS923-3
LoRa P2P status:
   P2P frequency 916000000
   P2P TX Power 22
   P2P BW 125
   P2P SF 7
   P2P CR 1
   P2P Preamble length 8
   P2P Symbol Timeout 0
```

----

## Stop application wakeup timer
**`void api_timer_stop(void)`**    
Stops the timer that wakes up the MCU frequently.

----

## Restart application timer with a new value
**`void api_timer_restart(uint32_t new_time)`**    
Restarts the timer with a new value. The value is in milliseconds

----

## Set hardcoded LoRa P2P settings
**`void api_read_credentials(void);`**    
**`void api_set_credentials(void);`**
If LoRa P2P settings need to be hardcoded (e.g. the frequency, bandwidth, ...) this can be done in **`setup_app()`**.
First the saved settings must be read from flash with **`api_read_credentials();`**, then settings can be changed. After changing the settings must be saved with **`api_set_credentials()`**.
As the WisBlock API checks if any changes need to be saved, the changed values will be only saved on the first boot after flashing the application.     
Example:    
```c++
// Read credentials from Flash
api_read_credentials();

// Make changes to the credentials
g_lorawan_settings.p2p_frequency = 916000000;			// Use 916 MHz to send and receive
g_lorawan_settings.p2p_bandwidth = 0;					// Bandwidth 125 kHz
g_lorawan_settings.p2p_sf = 7;							// Spreading Factor 7
g_lorawan_settings.p2p_cr = 1;							// Coding Rate 4/5
g_lorawan_settings.p2p_preamble_len = 8;				// Preample Length 8
g_lorawan_settings.p2p_tx_power = 22;					// TX power 22 dBi

// Save hard coded LoRaWAN settings
api_set_credentials();
```

📝  _**REMARK 1**_    
Hard coded settings must be set in **`void setup_app(void)`**!

📝  _**REMARK 2**_    
Keep in mind that parameters that are changed from with this method can be changed over AT command or BLE _**BUT WILL BE RESET AFTER A REBOOT**_!

----

## Send data over BLE UART (only RAK4631 and RAK11200)
**`api_ble_printf()`** can be used to send data over the BLE UART. **`print`**, **`println`** and **`printf`** is supported.     

📝  **REMARK**    
This command is not available on the RAK11310!    

----

## Restart BLE advertising (only RAK4631 and RAK11200)
By default the BLE advertising is only active for 30 seconds after power-up/reset to lower the power consumption. By calling **`void restart_advertising(uint16_t timeout);`** the advertising can be restarted for **`timeout`** seconds.

📝  **REMARK**    
This command is not available on the RAK11310!    

----

## Send data over LoRaWAN
**`lmh_error_status send_lora_packet(uint8_t *data, uint8_t size, uint8_t fport = 0);`** is used to send a data packet to the LoRaWAN server. **`*data`** is a pointer to the buffer containing the data, **`size`** is the size of the packet. If the fport is 0, the fPortdefined in the g_lorawan_settings structure is used.

----

## Send data over LoRa P2P
**`bool send_p2p_packet(uint8_t *data, uint8_t size);`** is used to send a data packet Over LORa P2P. **`*data`** is a pointer to the buffer containing the data, **`size`** is the size of the packet.

----

## Check result of LoRaWAN transmission
After the TX cycle (including RX1 and RX2 windows) are finished, the result is hold in the global flag **`g_rx_fin_result`**, the event **`LORA_TX_FIN`** is triggered and the **`lora_data_handler()`** callback is called. In this callback the result can be checked and if necessary measures can be taken.

----

# Cayenne LPP packet decoding
CayenneLPP is a format designed by [myDevices](https://mydevices.com/) to integrate LoRaWan nodes into their [IoT Platform](https://mydevices.com/capabilities).     
The [CayenneLPP library](https://github.com/ElectronicCats/CayenneLPP) extends the available data types with several IPSO data types not included in the original work by [Johan Stokking](https://github.com/TheThingsNetwork/arduino-device-lib) or most of the forks and side works by other people, these additional data types are not supported by myDevices Cayenne.     
The WisBlock API uses a few more data types that extends both the original and ElectronicCats data types to better support the wide range of the WisBlock Sensor Modules.   

----

## Usage of the WisBlock Extended Cayenne LPP data types

### 1) Include file required
To use the extended data types WisBlock API already includes the required header file.

### 2) Definition of the packet buffer
To be able to use the Cayenne LPP functions, an instance of the class is required.
```cpp
/** LoRaWAN packet */
WisCayenne g_solution_data(255);
```

### 3) Reset the packet buffer
Before adding data, the packet buffer needs to be reset
```cpp
// Reset the packet
g_solution_data.reset();
```

### 4) Add data to the buffer
The CayenneLPP library has API calls for the different data types supported. See [CayenneLPP API](https://github.com/ElectronicCats/CayenneLPP/blob/master/API.md) for details. In addition to these API calls WisBlock API adds 5 more calls to them. These API calls are for different GNSS formats and for the VOC sensor data:    
```cpp
uint8_t addGNSS_4(uint8_t channel, int32_t latitude, int32_t longitude, int32_t altitude);
uint8_t addGNSS_6(uint8_t channel, int32_t latitude, int32_t longitude, int32_t altitude);
uint8_t addGNSS_H(int32_t latitude, int32_t longitude, int16_t altitude, int16_t accuracy, int16_t battery);
uint8_t addGNSS_T(int32_t latitude, int32_t longitude, int16_t altitude, float accuracy, int8_t sats);
uint8_t addVoc_index(uint8_t channel, uint32_t voc_index);
```

1) Standard Cayenne LPP location format
```cpp
/**
 * @brief Add GNSS data in Cayenne LPP standard format
 *
 * @param channel LPP channel
 * @param latitude Latitude as read from the GNSS receiver
 * @param longitude Longitude as read from the GNSS receiver
 * @param altitude Altitude as read from the GNSS receiver
 * @return uint8_t bytes added to the data packet
 */
uint8_t WisCayenne::addGNSS_4(uint8_t channel, int32_t latitude, int32_t longitude, int32_t altitude)
```

2) Extended precision location format
```cpp
/**
 * @brief Add GNSS data in custom Cayenne LPP format
 *        Requires changed decoder in LNS and visualization
 *        Does not work with Cayenne LPP MyDevices
 *
 * @param channel LPP channel
 * @param latitude Latitude as read from the GNSS receiver
 * @param longitude Longitude as read from the GNSS receiver
 * @param altitude Altitude as read from the GNSS receiver
 * @return uint8_t bytes added to the data packet
 */
uint8_t WisCayenne::addGNSS_6(uint8_t channel, int32_t latitude, int32_t longitude, int32_t altitude)
```

3) Helium Mapper data format. 
This is not a CayenneLPP format. The API is just used to make it easier to create a data packet that makes it easier to generate a packet that is compatible with the [Helium Mapper integration](https://docs.helium.com/use-the-network/coverage-mapping/mappers-quickstart/).
```cpp
/**
 * @brief Add GNSS data in Helium Mapper format
 *
 * @param channel LPP channel
 * @param latitude Latitude as read from the GNSS receiver
 * @param longitude Longitude as read from the GNSS receiver
 * @param altitude Altitude as read from the GNSS receiver
 * @param accuracy Accuracy of reading from the GNSS receiver
 * @param battery Device battery voltage in V
 * @return uint8_t bytes added to the data packet
 */
uint8_t WisCayenne::addGNSS_H(int32_t latitude, int32_t longitude, int16_t altitude, int16_t accuracy, int16_t battery)
```

4) disk91 LoRaWAN field tester data format. This is as well not a CayenneLPP format. The API is just used to make it easier to create a data packet that makes it easier to generate a packet that is compatible with the [Low Cost LoRaWan Field Tester](https://www.disk91.com/2021/technology/lora/low-cost-lorawan-field-tester/).
```cpp
/**
 * @brief Add GNSS data in Field Tester format
 *
 * @param latitude Latitude as read from the GNSS receiver
 * @param longitude Longitude as read from the GNSS receiver
 * @param altitude Altitude as read from the GNSS receiver
 * @param accuracy Accuracy of reading from the GNSS receiver
 * @param sats Number of satellites of reading from the GNSS receiver
 * @return uint8_t bytes added to the data packet
 */
uint8_t WisCayenne::addGNSS_T(int32_t latitude, int32_t longitude, int16_t altitude, float accuracy, int8_t sats)
```

5) VOC sensor data requires a digital format with 16 bits length that is not supported by CayenneLPP originally.
```cpp
/**
 * @brief Add the VOC index
 *
 * @param channel VOC channel
 * @param voc_index VOC index
 * @return uint8_t bytes added to the data packet
 */
uint8_t WisCayenne::addVoc_index(uint8_t channel, uint32_t voc_index)
```

----

## Data types and channel numbers used with WisBlock API
The CayenneLPP data packets are always in the format `<Channel #><Channel ID><data bytes>`.     
To make it easier in data encoders used in LoRaWAN servers and integration data collected by WisBlock sensors have always the same channel number (if these API is used). Here is the list of currently assigned channel numbers, channel ID's and which modules are using the combination.    

| Data                     | Channel # | Channel ID | Length   | Comment                                           | Required Module   | Decoded Field Name |
| --                       | --        | --         | --       | --                                                | --                | --                 |
| Battery value            | 1         | _**116**_  | 2 bytes  | 0.01 V Unsigned MSB                               | RAK4631           | voltage_1          |
| Humidity                 | 2         | 104        | 1 byte   | in %RH                                            | RAK1901           | humidity_2         |
| Temperature              | 3         | 103        | 2 bytes  | in °C                                             | RAK1901           | temperature_3      | 
| Barometric Pressure      | 4         | 115        | 2 bytes  | in hPa (mBar)                                     | RAK1902           | barometer_4        |
| Illuminance              | 5         | 101        | 2 bytes  | 1 lux unsigned                                    | RAK1903           | illuminance_5      |
| Humidity 2               | 6         | 104        | 1 byte   | in %RH                                            | RAK1906           | humidity_6         |
| Temperature 2            | 7         | 103        | 2 bytes  | in °C                                             | RAK1906           | temperature_7      | 
| Barometric Pressure 2    | 8         | 115        | 2 bytes  | in hPa (mBar)                                     | RAK1906           | barometer_8        |
| Gas Resistance 2         | 9         | 2          | 2 bytes  | 0.01 signed (kOhm)                                | RAK1906           | analog_9           |
| GNSS stand. resolution   | 10        | 136        | 9 bytes  | 3 byte lon/lat 0.0001 °, 3 bytes alt 0.01 meter   | RAK1910, RAK12500 | gps_10             |
| GNSS enhanced resolution | 10        | _**137**_  | 11 bytes | 4 byte lon/lat 0.000001 °, 3 bytes alt 0.01 meter | RAK1910, RAK12500 | gps_10             |
| Soil Temperature         | 11        | 103        | 2 bytes  | in °C                                             | RAK12023/RAK12035 | temperature_11     |
| Soil Humidity            | 12        | 104        | 1 byte   | in %RH                                            | RAK12023/RAK12035 | humidity_12        |
| Soil Humidity Raw        | 13        | 2          | 2 bytes  | 0.01 signed                                       | RAK12023/RAK12035 | analog_in_13       |
| Soil Data Valid          | 14        | 102        | 1 byte   | bool                                              | RAK12023/RAK12035 | presence_14        |
| Illuminance 2            | 15        | 101        | 2 bytes  | 1 lux unsigned                                    | RAK12010          | illuminance_15     |
| VOC                      | 16        | _**138**_  | 2 bytes  | VOC index                                         | RAK12047          | voc_16             |
| MQ2 Gas                  | 17        | 2          | 2 bytes  | 0.01 signed                                       | RAK12004          | analog_in_17       |
| MQ2 Gas Percentage       | 18        | _**120**_  | 1 byte   | 1-100% unsigned                                   | RAK12004          | percentage_18      |
| MG812 Gas                | 19        | 2          | 2 bytes  | 0.01 signed                                       | RAK12008          | analog_in_19       |
| MG812 Gas Percentage     | 20        | _**120**_  | 1 byte   | 1-100% unsigned                                   | RAK12008          | percentage_20      |
| MQ3 Alcohol Gas          | 21        | 2          | 2 bytes  | 0.01 signed                                       | RAK12009          | analog_in_21       |
| MQ3 Alcohol Gas Perc.    | 22        | _**120**_  | 1 byte   | 1-100% unsigned                                   | RAK12009          | percentage_22      |
| ToF distance             | 23        | 2          | 2 bytes  | 0.01 signed                                       | RAK12014          | analog_in_23       |
| ToF Data Valid           | 24        | 102        | 1 byte   | bool                                              | RAK12014          | presence_24        |
| Gyro triggered           | 25        | _**134**_  | 6 bytes  | 2 bytes per axis, 0.01 °/s                        | RAK12025          | gyrometer_25       |
| Gesture detected         | 26        | 0          | 1 byte   | 1 byte with id of gesture                         | RAK14008          | digital_in_26      |
| LTR390 UVI value         | 27        | 2          | 2 bytes  | 0.01 signed                                       | RAK12019          | analog_in_27       | 
| LTR390 UVS value         | 28        | 101        | 2 bytes  | 1 lux unsigned                                    | RAK12019          | illuminance_28     | 
| INA219 Current           | 29        | 2          | 2 bytes  | 0.01 signed                                       | RAK16000          | analog_29          | 
| INA219 Voltage           | 30        | 2          | 2 bytes  | 0.01 signed                                       | RAK16000          | analog_30          | 
| INA219 Power             | 31        | 2          | 2 bytes  | 0.01 signed                                       | RAK16000          | analog_31          | 
| Touchpad left            | 32        | 102        | 1 byte   | bool                                              | RAK14002          | presence_32        | 
| Touchpad middle          | 33        | 102        | 1 byte   | bool                                              | RAK14002          | presence_33        | 
| Touchpad right           | 34        | 102        | 1 byte   | bool                                              | RAK14002          | presence_34        | 
| SCD30 CO2 concentration  | 35        | 125        | 2 bytes  | 1 ppm unsigned                                    | RAK12037          | concentration_35   |
| SCD30 temperature        | 36        | 103        | 2 bytes  | in °C                                             | RAK12037          | temperature_36     |
| SCD30 humidity           | 37        | 104        | 1 byte   | in %RH                                            | RAK12037          | humidity_37        |
| MLX90632 sensor temp     | 38        | 103        | 2 bytes  | in °C                                             | RAK12003          | temperature_38     |
| MLX90632 object temp     | 39        | 103        | 2 bytes  | in °C                                             | RAK12003          | temperature_39     |
| PM 1.0 value             | 40        | 103        | 2 bytes  | in ug/m3                                          | RAK12003          | voc_40             |
| PM 2.5 value             | 41        | 103        | 2 bytes  | in ug/m3                                          | RAK12003          | voc_41             |
| PM 10 value              | 42        | 103        | 2 bytes  | in ug/m3                                          | RAK12003          | voc_42             |
| Earthquake event         | 43        | 102        | 1 byte   | bool                                              | RAK12027          | presence_43        |
| Earthquake SI value      | 44        | 2          | 2 bytes  | analog 10 * m/s                                   | RAK12027          | analog_44          |
| Earthquake PGA value     | 45        | 2          | 2 bytes  | analog 10 * m/s2                                  | RAK12027          | analog_45          |
| Earthquake SHUTOFF alert | 46        | 102        | 1 byte   | bool                                              | RAK12027          | presence_46        |
| LPP_CHANNEL_EQ_COLLAPSE  | 47        | 102        | 1 byte   | bool                                              | RAK12027          | presence_47        |
| Switch Status            | 48        | 102        | 1 byte   | bool                                              | RAK13011          | presence_48        |

### 📝 _REMARK_
Channel ID's in cursive are extended format and not supported by standard Cayenne LPP data decoders.

### 📝_REMARK_ 
An full and updated list of used data formats can be found in our [RAKwireless_Standardized_Payload](https://github.com/RAKWireless/RAKwireless_Standardized_Payload) ⤴️.     
The RAKwireless_Standardized_Payload repo includes as well a matching decoder.

----

# Simple code example of the user application
The code used here is the [api-test.ino](./examples/api-test) example.

----

## Includes and definitions
These are the required includes and definitions for the user application and the API interface    
In this example we hard-coded the LoRaWAN credentials. It is strongly recommended **TO NOT DO THAT** to avoid duplicated node credentials    
Alternative options to setup credentials are
- over USB with [AT-Commands](./AT-Commands.md)
- over BLE with [WisBlock Toolbox](https://play.google.com/store/apps/details?id=tk.giesecke.wisblock_toolbox) :arrow_upper_right: 

```c++
#include <Arduino.h>
/** Add you required includes after Arduino.h */
#include <Wire.h>

// Debug output set to 0 to disable app debug output
#ifndef MY_DEBUG
#define MY_DEBUG 1
#endif

#ifdef NRF52_SERIES
#if MY_DEBUG > 0
#define MYLOG(tag, ...)                     \
	do                                      \
	{                                       \
		if (tag)                            \
			PRINTF("[%s] ", tag);           \
		PRINTF(__VA_ARGS__);                \
		PRINTF("\n");                       \
		if (g_ble_uart_is_connected)        \
		{                                   \
			g_ble_uart.printf(__VA_ARGS__); \
			g_ble_uart.printf("\n");        \
		}                                   \
	} while (0)
#else
#define MYLOG(...)
#endif
#endif
#ifdef ARDUINO_ARCH_RP2040
#if MY_DEBUG > 0
#define MYLOG(tag, ...)                  \
	do                                   \
	{                                    \
		if (tag)                         \
			Serial.printf("[%s] ", tag); \
		Serial.printf(__VA_ARGS__);      \
		Serial.printf("\n");             \
	} while (0)
#else
#define MYLOG(...)
#endif
#endif

/** Include the WisBlock-API-V2 */
#include <WisBlock-API-V2.h> // Click to install library: http://librarymanager/All#WisBlock-API-V2

/** Define the version of your SW */
#define SW_VERSION_1 1 // major version increase on API change / not backwards compatible
#define SW_VERSION_2 0 // minor version increase on API change / backward compatible
#define SW_VERSION_3 0 // patch version increase on bugfix, no affect on API

/**
   Optional hard-coded LoRaWAN credentials for OTAA and ABP.
   It is strongly recommended to avoid duplicated node credentials
   Options to setup credentials are
   - over USB with AT commands
   - over BLE with My nRF52 Toolbox
*/
uint8_t node_device_eui[8] = {0x00, 0x0D, 0x75, 0xE6, 0x56, 0x4D, 0xC1, 0xF3};
uint8_t node_app_eui[8] = {0x70, 0xB3, 0xD5, 0x7E, 0xD0, 0x02, 0x01, 0xE1};
uint8_t node_app_key[16] = {0x2B, 0x84, 0xE0, 0xB0, 0x9B, 0x68, 0xE5, 0xCB, 0x42, 0x17, 0x6F, 0xE7, 0x53, 0xDC, 0xEE, 0x79};
uint8_t node_nws_key[16] = {0x32, 0x3D, 0x15, 0x5A, 0x00, 0x0D, 0xF3, 0x35, 0x30, 0x7A, 0x16, 0xDA, 0x0C, 0x9D, 0xF5, 0x3F};
uint8_t node_apps_key[16] = {0x3F, 0x6A, 0x66, 0x45, 0x9D, 0x5E, 0xDC, 0xA6, 0x3C, 0xBC, 0x46, 0x19, 0xCD, 0x61, 0xA1, 0x1E};
```

Forward declarations of some functions (required when using PlatformIO)    
```c++
/** Application function definitions */
void setup_app(void);
bool init_app(void);
void app_event_handler(void);
void ble_data_handler(void) __attribute__((weak));
void lora_data_handler(void);
```

Here the application name is set to **RAK-TEST**. The name will be extended with the nRF52 unique chip ID. This name is used in the BLE advertising.
```c++
/** Application stuff */

/** Set the device name, max length is 10 characters */
char g_ble_dev_name[10] = "RAK-TEST";
```

Some flags and signals required
```c++
/** Flag showing if TX cycle is ongoing */
bool lora_busy = false;

/** Send Fail counter **/
uint8_t send_fail = 0;
```

----

## setup_app
This function is called at the very beginning of the application start. In this function everything should be setup that is required before Arduino **`setup()`** is executed. This could be for example the LoRaWAN credentials.
In this example we hard-coded the LoRaWAN credentials. It is strongly recommended **TO NOT DO THAT** to avoid duplicated node credentials    
Alternative options to setup credentials are
- over USB with [AT-Commands](./AT-Commands.md)
- over BLE with [WisBlock Toolbox](https://play.google.com/store/apps/details?id=tk.giesecke.wisblock_toolbox) :arrow_upper_right: 
In this function the global flag `g_enable_ble` is set. If true, the BLE interface is initialized. If false, the BLE interface is not activated, which can lower the power consumption.
```c++
void setup_app(void)
{
  Serial.begin(115200);
  time_t serial_timeout = millis();
  // On nRF52840 the USB serial is not available immediately
  while (!Serial)
  {
    if ((millis() - serial_timeout) < 5000)
    {
      delay(100);
      digitalWrite(LED_GREEN, !digitalRead(LED_GREEN));
    }
    else
    {
      break;
    }
  }
  digitalWrite(LED_GREEN, LOW);
  
  MYLOG("APP", "Setup WisBlock API Example");

#ifdef NRF52_SERIES
  // Enable BLE
  g_enable_ble = true;
#endif

  // Set firmware version
  api_set_version(SW_VERSION_1, SW_VERSION_2, SW_VERSION_3);

  // Optional
  // Setup LoRaWAN credentials hard coded
  // It is strongly recommended to avoid duplicated node credentials
  // Options to setup credentials are
  // -over USB with AT commands
  // -over BLE with My nRF52 Toolbox

  // Read LoRaWAN settings from flash
  api_read_credentials();
  // Change LoRaWAN settings
  g_lorawan_settings.auto_join = true;							// Flag if node joins automatically after reboot
  g_lorawan_settings.otaa_enabled = true;							// Flag for OTAA or ABP
  memcpy(g_lorawan_settings.node_device_eui, node_device_eui, 8); // OTAA Device EUI MSB
  memcpy(g_lorawan_settings.node_app_eui, node_app_eui, 8);		// OTAA Application EUI MSB
  memcpy(g_lorawan_settings.node_app_key, node_app_key, 16);		// OTAA Application Key MSB
  memcpy(g_lorawan_settings.node_nws_key, node_nws_key, 16);		// ABP Network Session Key MSB
  memcpy(g_lorawan_settings.node_apps_key, node_apps_key, 16);	// ABP Application Session key MSB
  g_lorawan_settings.node_dev_addr = 0x26021FB4;					// ABP Device Address MSB
  g_lorawan_settings.send_repeat_time = 120000;					// Send repeat time in milliseconds: 2 * 60 * 1000 => 2 minutes
  g_lorawan_settings.adr_enabled = false;							// Flag for ADR on or off
  g_lorawan_settings.public_network = true;						// Flag for public or private network
  g_lorawan_settings.duty_cycle_enabled = false;					// Flag to enable duty cycle (validity depends on Region)
  g_lorawan_settings.join_trials = 5;								// Number of join retries
  g_lorawan_settings.tx_power = 0;								// TX power 0 .. 15 (validity depends on Region)
  g_lorawan_settings.data_rate = 3;								// Data rate 0 .. 15 (validity depends on Region)
  g_lorawan_settings.lora_class = 0;								// LoRaWAN class 0: A, 2: C, 1: B is not supported
  g_lorawan_settings.subband_channels = 1;						// Subband channel selection 1 .. 9
  g_lorawan_settings.app_port = 2;								// Data port to send data
  g_lorawan_settings.confirmed_msg_enabled = LMH_UNCONFIRMED_MSG; // Flag to enable confirmed messages
  g_lorawan_settings.resetRequest = true;							// Command from BLE to reset device
  g_lorawan_settings.lora_region = LORAMAC_REGION_AS923_3;		// LoRa region
  // Save LoRaWAN settings
  api_set_credentials();
```

----

## init_app
This function is called after BLE and LoRa are already initialized. Ideally this is the place to initialize application specific stuff like sensors or actuators. In this example it is unused    

```c++
/**
 * @brief Application specific initializations
 * 
 * @return true Initialization success
 * @return false Initialization failure
 */
bool init_app(void)
{
	MYLOG("APP", "init_app");
	return true;
}
```

----

## app_event_handler
This callback is called on the **STATUS** event. The **STATUS** event is triggered frequently, the time is set by `send_repeat_time`. It is triggered as well by user defined events. See example **RAK1904_example**_ how user defined events are defined.
_**It is important that event flags are reset. As example the STATUS event is reset by this code sequence:**
```c++
if ((g_task_event_type & STATUS) == STATUS)
{
	g_task_event_type &= N_STATUS;
	...
}
```
The **STATUS** event is used to send frequently uplink packets to the LoRaWAN server.    
In this example code we restart as well the BLE advertising for 15 seconds. Otherwise BLE adverstising is only active for 30 seconds after power-up/reset.    
```c++
void app_event_handler(void)
{
  // Timer triggered event
  if ((g_task_event_type & STATUS) == STATUS)
  {
    g_task_event_type &= N_STATUS;
    MYLOG("APP", "Timer wakeup");

#ifdef NRF52_SERIES
    // If BLE is enabled, restart Advertising
    if (g_enable_ble)
    {
      restart_advertising(15);
    }
#endif

    if (lora_busy)
    {
      MYLOG("APP", "LoRaWAN TX cycle not finished, skip this event");
    }
    else
    {

      // Dummy packet

      uint8_t dummy_packet[] = {0x10, 0x00, 0x00};

      lmh_error_status result = send_lora_packet(dummy_packet, 3);
      switch (result)
      {
        case LMH_SUCCESS:
          MYLOG("APP", "Packet enqueued");
          // Set a flag that TX cycle is running
          lora_busy = true;
          break;
        case LMH_BUSY:
          MYLOG("APP", "LoRa transceiver is busy");
          break;
        case LMH_ERROR:
          MYLOG("APP", "Packet error, too big to send with current DR");
          break;
      }
    }
  }
}
```

----

## ble_data_handler
This callback is used to handle data received over the BLE UART. If you do not need BLE UART functionality, you can remove this function completely.
In this example we forward the received BLE UART data to the AT command interpreter. This way, we can submit AT commands either over the USB port or over the BLE UART port.    
BLE communication is only supported on the RAK4631. The RAK11310 does not have BLE.

```c++
#ifdef NRF52_SERIES
void ble_data_handler(void)
{
  if (g_enable_ble)
  {
    /**************************************************************/
    /**************************************************************/
    /// \todo BLE UART data arrived
    /// \todo or forward them to the AT command interpreter
    /// \todo parse them here
    /**************************************************************/
    /**************************************************************/
    if ((g_task_event_type & BLE_DATA) == BLE_DATA)
    {
      MYLOG("AT", "RECEIVED BLE");
      // BLE UART data arrived
      // in this example we forward it to the AT command interpreter
      g_task_event_type &= N_BLE_DATA;

      while (g_ble_uart.available() > 0)
      {
        at_serial_input(uint8_t(g_ble_uart.read()));
        delay(5);
      }
      at_serial_input(uint8_t('\n'));
    }
  }
}
#endif
```

----

## lora_data_handler
This callback is called on three different events:

### 1 LORA_DATA
The event **LORA_DATA** is triggered if a downlink packet from the LoRaWAN server or a LoRa P2P packet has arrived. In this example we are not parsing the data, they are only printed out to the LOG and over BLE UART (if a device is connected)

### 2 LORA_TX_FIN
The event **LORA_TX_FIN** is triggered after sending an uplink packet is finished, including the RX1 and RX2 windows. If **CONFIRMED** packets are sent, the global flag **`g_rx_fin_result`** contains the result of the confirmed transmission. If **`g_rx_fin_result`** is true, the LoRaWAN server acknowledged the uplink packet by sending an **`ACK`**. Otherwise the **`g_rx_fin_result`** is set to false, indicating that the packet was not received by the LoRaWAN server (no gateway in range, packet got damaged on the air. If **UNCONFIRMED** packets are sent or if **LoRa P2P mode** is used, the flag **`g_rx_fin_result`** is always true. 

### 3 LORA_JOIN_FIN
The event **LORA_JOIN_FIN** is called after the Join request/Join accept/reject cycle is finished. The global flag **`g_task_event_type`** contains the result of the Join request. If true, the node has joined the network. If false the join didn't succeed. In this case the join cycle could be restarted or the node could report an error.

```c++
void lora_data_handler(void)
{
  // LoRa data handling
  if ((g_task_event_type & LORA_DATA) == LORA_DATA)
  {
    /**************************************************************/
    /**************************************************************/
    /// \todo LoRa data arrived
    /// \todo parse them here
    /**************************************************************/
    /**************************************************************/
    g_task_event_type &= N_LORA_DATA;
    MYLOG("APP", "Received package over LoRa");
    char log_buff[g_rx_data_len * 3] = {0};
    uint8_t log_idx = 0;
    for (int idx = 0; idx < g_rx_data_len; idx++)
    {
      sprintf(&log_buff[log_idx], "%02X ", g_rx_lora_data[idx]);
      log_idx += 3;
    }
    lora_busy = false;
    MYLOG("APP", "%s", log_buff);
  }

  // LoRa TX finished handling
  if ((g_task_event_type & LORA_TX_FIN) == LORA_TX_FIN)
  {
    g_task_event_type &= N_LORA_TX_FIN;

    MYLOG("APP", "LPWAN TX cycle %s", g_rx_fin_result ? "finished ACK" : "failed NAK");

    if (!g_rx_fin_result)
    {
      // Increase fail send counter
      send_fail++;

      if (send_fail == 10)
      {
        // Too many failed sendings, reset node and try to rejoin
        delay(100);
        sd_nvic_SystemReset();
      }
    }

    // Clear the LoRa TX flag
    lora_busy = false;
  }

  // LoRa Join finished handling
  if ((g_task_event_type & LORA_JOIN_FIN) == LORA_JOIN_FIN)
  {
    g_task_event_type &= N_LORA_JOIN_FIN;
    if (g_join_result)
    {
      MYLOG("APP", "Successfully joined network");
    }
    else
    {
      MYLOG("APP", "Join network failed");
      /// \todo here join could be restarted.
      // lmh_join();
    }
  }
}
```

----

# Debug and Powersave Settings

## Arduino    
In Arduino it is not possible to define settings in the .ino file that can control behaviour of the the included libraries. To change debug log and usage of the blue BLE LED you have to open the file [**`WisBlock-API-V2.h`**](./src/WisBlock.h) in the libraries source folder.

----
### Debug Log Output
To enable/disable the API debug (**`API_LOG()`**) open the file [**`WisBlock-API-V2.h`**](./src/WisBlock.h) in the libraries source folder.    
Look for 
```c++
#define API_DEBUG 1
```
in the file.      

    0 -> No debug output
    1 -> API debug output

To enable/disable the application debug (**`MY_LOG()`**) You can find in the examples (either in the .ino file or app.h)     
```c++
#define MY_DEBUG 1
```
in the file.      

    0 -> No debug output
    1 -> Application debug output


----

### Disable the blue BLE LED
Look for 
```c++
#define NO_BLE_LED 1
```
in the file **`WisBlock-API-V2`**     

    0 -> the blue LED will be used to indicate BLE status
    1 -> the blue LED will not used

📝 _**REMARK**_    
RAK11310 has no BLE and the blue LED can be used for other purposes.    

----

## PlatformIO
Debug output can be controlled by defines in the platformio.ini
**`API_DEBUG`** controls debug output of the WisBlock API

    0 -> No debug outpuy
    1 -> WisBlock API debug output

**`MY_DEBUG`** controls debug output of the application itself

    0 -> No debug outpuy
    1 -> Application debug output

**`NO_BLE_LED`** controls the usage of the blue BLE LED.    

    0 -> the blue LED will be used to indicate BLE status
    1 -> the blue LED will not used

Example for no debug output and no blue LED
```ini
build_flags = 
	-DAPI_DEBUG=0    ; 0 Disable WisBlock API debug output
	-DMY_DEBUG=0     ; 0 Disable application debug output
	-DNO_BLE_LED=1   ; 1 Disable blue LED as BLE notificator
```

----
# License    
Library published under MIT license    

**Credits:**    
AT Command functions: Taylor Lee (taylor.lee@rakwireless.com)

----
# Changelog
[Code releases](CHANGELOG.md)
- 2024-10-17 AT command parsing and default fPort changes
  - Allow upper and lower case and special characters in AT commands after the "="
  - Change LoRaWAN default fPort from 0 to 1
- 2024-06-26 Fix dependency to CayenneLPP
  - Ownership of library has changed, PIO couldn't find the library
- 2023-12-24 Rework AT commands
  - Make AT+PBW and AT+P2P compatible with WisToolBox
- 2023-12-19 Add Arduino-Pico support
  - Support RAK11300 with Arduino-Pico BSP
- 2023-12-07 Fix ESP32
  - Make ESP32 work with WisBlock-API-V2
- 2023-11-22 Fix AT+PRECV command
  - Set RX_CONTINOUS depending on receive mode and re-initialize the LoRa transceiver 
- 2023-09-01 New feature/bug-fix
  - Fix missing return value for ATC commands
  - Add option to re-init LoRaWAN stack
- 2023-08-26 New features
  - Add AT command for force OTA DFU mode on RAK4631
  - Add re-initialize function for LoRaWAN (fix problem with confirmed msg NAK)
- 2023-08-18 Fix more compatibility problems with latest WisToolBox version
  - Give correct ATC+.... return instead of only AT+... for custom AT commands
- 2023-08-11 Fix compatibility problem with latest WisToolBox version
  - Change AT error return values from +CME... to the new error strings
- 2023-07-20 Add TX failed for LoRa P2P
  - Add g_rx_fin_result = false; and call TX callback if CAD returns channel activity found
- 2023-06-23 Fix CR bug
  - CR values are different between SX126x-Arduino and RUI3
- 2023-05-22 Enhance AT commands
  - Add option to set device alias
- 2023-05-21
  - Enhance AT+BOOT to work with RP2040 
  - Add option for custom boards (no LED's no BLE advertising)
- 2023-05-20
  - Add AT+BOOT command to force DFU/UF2 bootloader mode
- 2023-05-16
  - Add new CayenneLPP type for device ID (for Hummingbird PoC)
- 2023-05-15
  - Some clean-up and improvement (e.g. no hang if LoRa init fails)
- 2023-04-30
  - Added option to set the LoRaWAN port using the AT command set. Thanks to @xoseperez## 2.0.5 Fix new AT command
  - Fix wrong implementation of AT+PORT command
- 2023-04-07
  - Fix value overflow in AT command AT+MASK
- 2023-03-18
  - Change status output (separate LoRaWAN and P2P)
- 2023-02-16
  - Fix wrong mapping for RUI3 bandwidths to WisBlock API bandwidths
- 2023-02-16
  - Change include file name to avoid conflicts with old WisBlock API
- 2023-02-05
  - Ready to create RUI3 compatible AT command library as WisBlock-API-V2
- 2023-01-27
  - Start switching to RUI3 compatible AT command format
  - Add check to fix device hanging when wrong subband is selected (e.g. AU915 subband 2 switch to AS923 without changing the subband to 1)
- 2022-11-13
  - Add WisBlock Cayenne LPP setup to make it easier to use from examples
  - Replace AT command SENDFREQ with SENDINT to make it's meaning easier to understand (use word interval instead of frequency)
- 2022-10-09    
  - Add experimental support for RAK11200    
- 2022-07-27
  - Correct AT command manual
- 2022-06-05
  - Make AT commands accept lower and upper case
  - AT+BAT=? returns battery level in volt instead of 0 - 254
  - BLE name changed to part of DevEUI for easier recognition of a device
  - Change ADC sampling time to 10 us for better accuracy
- 2022-05-11
  - Removed support for external NV memory. Better to keep this on application level
- 2022-04-18
  - Add support for external NV memory. Prioritize usage of external NV memory over MCU flash memory.
- 2022-04-03
  - Fix LoRa P2P bug. In LoRa P2P the automatic sending did not work because g_lpwan_has_joined stayed on false.
- 2022-03-01
  - Fix timer bug. If timer is restarted with a new time, there was a bug that actually stopped the timer
- 2022-02-24
  - Change handling of user AT commands for more flexibility
  - Define alternate pdMS_TO_TICKS that casts uint64_t for long intervals due to limitation in nrf52840 BSP
  - Switch from using SoftwareTimer for nRF52 to using xTimer due to above problem
- 2022-02-20
  - If auto join for LPWAN is disabled, LoRa P2P mode is not working. Fixed.
- 2022-02-18
  - Change response of AT+P2P=? to show bandwidth instead of index number
- 2022-02-16
  - Remove send duration limit of 3600 seconds
- 2022-01-30
  - Add more API functions and update README
- 2022-01-25
  - Add experimental support for RAK11310
- 2022-01-22
  - Make it easier to use custom AT commands and list them with AT?
- 2022-01-03
  - Instead of endless loop, leave error handling to the application
- 2021-12-06
  - Fix LoRa P2P
- 2021-12-04
  - Fix BLE MTU size
- 2021-11-26
  - Keep it backward compatible, rename LoRa P2P send function
- 2021-11-18
  - Cleanup
- 2021-11-16
  - Update documentation
- 2021-11-15
  - Add LoRa P2P support
  - Add support for user defined AT commands
- 2021-11-06
  - Add library dependency for SX126x-Arduino library
- 2021-11-03
  - Make AT+JOIN conform with RAKwireless AT Command syntax
  - Add AT+STATUS and AT+SEND commands
  - Make AT+NJM compatible with RAK3172
  - Fix compiler warning
  - Fix AT+STATUS command
- 2021-09-29
  - Fixed bug in AT+DR and AT+TXP commands
- 2021-09-25
  - Added `api_read_credentials()`
  - `api_set_credentials()` saves to flash
  - Updated examples
- 2021-09-24:
  - Fix AT command response delay
  - Add AT+MASK command to change channel settings for AU915, EU433 and US915
- 2021-09-19:
  - Change debug output to generic `WisBlock API LoRaWAN` instead of GNSS
- 2021-09-12:
  - Improve examples
- 2021-09-11:
  - V1.0.0 First release
