The RAKwireless RAK3172 module has “ATR – Restore to Default Parameters” command. To see what settings were “restored” I modified the BreakOutSerial application to send an ATR command to reset the device, then display the DevEUI, JoinEUI, and AppKey.
public static void Main()
{
Debug.WriteLine("devMobile.IoT.LoRaWAN.nanoFramework.RAK3172 BreakoutSerial starting");
try
{
// set GPIO functions for COM2 (this is UART1 on ESP32)
#if ESP32_WROOM
Configuration.SetPinFunction(Gpio.IO17, DeviceFunction.COM2_TX);
Configuration.SetPinFunction(Gpio.IO16, DeviceFunction.COM2_RX);
#endif
Debug.Write("Ports:");
foreach (string port in SerialPort.GetPortNames())
{
Debug.Write($" {port}");
}
Debug.WriteLine("");
using (_SerialPort = new SerialPort(SerialPortId))
{
// set parameters
_SerialPort.BaudRate = 115200;
_SerialPort.Parity = Parity.None;
_SerialPort.DataBits = 8;
_SerialPort.StopBits = StopBits.One;
_SerialPort.Handshake = Handshake.None;
_SerialPort.NewLine = "\r\n";
_SerialPort.ReadTimeout = 1000;
//_SerialPort.WatchChar = '\n'; // May 2022 WatchChar event didn't fire github issue https://github.com/nanoframework/Home/issues/1035
#if SERIAL_ASYNC_READ
_SerialPort.DataReceived += SerialDevice_DataReceived;
#endif
_SerialPort.Open();
_SerialPort.WatchChar = '\n';
_SerialPort.ReadExisting(); // Running at 115K2 this was necessary
...
for (int i = 0; i < 5; i++)
{
string atCommand;
atCommand = "AT+VER=?";
//atCommand = "AT+SN=?"; // Empty response?
//atCommand = "AT+HWMODEL=?";
//atCommand = "AT+HWID=?";
//atCommand = "AT+DEVEUI=?";
//atCommand = "AT+APPEUI=?";
//atCommand = "AT+APPKEY=?";
//atCommand = "ATR";
//atCommand = "AT+SLEEP=4000";
Debug.WriteLine("");
Debug.WriteLine($"{i} TX:{atCommand} bytes:{atCommand.Length}--------------------------------");
_SerialPort.WriteLine(atCommand);
Thread.Sleep(5000);
}
}
...
Debug.WriteLine("Done");
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
After resetting the device I modified the code to display some of the configuration.
To reconfigure the device I ran the RAK3172LoRaWANDeviceClient application with DEVICE_DEVEUI_SET, OTAA, UNCONFIRMED, REGION_SET and ADR_SET defined. The testrig could then successfully connect to The Things Network and when the device was power cycled the configuration was retained.
public Result FactoryReset()
{
#if DIAGNOSTICS
Debug.WriteLine($" {DateTime.UtcNow:hh:mm:ss} ATR");
#endif
Result result = SendCommand("OK", "ATR", CommandTimeoutDefault);
if (result != Result.Success)
{
#if DIAGNOSTICS
Debug.WriteLine($" {DateTime.UtcNow:hh:mm:ss} ATR failed {result}");
#endif
return result;
}
return Result.Success;
}
I have added a “FactoryReset” method to the RAK3172LoRaWANDevice library.