ESPSendBytesProc
  ESPSendBytes()
    SyncLoop (hardcoded, doesn't need escaping)
  ESPReadReg
    eFuses (x2, hardcoded, doesn't need escaping)
    MAC (x3, hardcoded, doesn't need escaping)
  ESPSendCmdWithDataProc (x2)
    Needs special treatment for first and last $C0
  ESPValidateCmdProc
    Needs special treatment for first and last $C0
