Basic connectivity
Over the weekend I have been working on a GHI Electronics TinyCLR V2 C# library for my modified RAK811 LPWAN Evaluation Board(EVB) from RAK Wireless. My initial test rig is based on an Fezduino board which has Arduino Uno R3 format socket for the EVB.
The code has compile time options for synchronous and asynchronous operation.
public class Program
{
private static UartController serialDevice;
private const string ATCommand = "at+version\r\n";
#if TINYCLR_V2_FEZDUINO
private static string SerialPortId = SC20100.UartPort.Uart5;
#endif
public static void Main()
{
Debug.WriteLine("devMobile.IoT.Rak811.ShieldSerial starting");
try
{
serialDevice = UartController.FromName(SerialPortId);
serialDevice.SetActiveSettings(new UartSetting()
{
BaudRate = 9600,
Parity = UartParity.None,
StopBits = UartStopBitCount.One,
Handshaking = UartHandshake.None,
DataBits = 8
});
serialDevice.Enable();
#if SERIAL_ASYNC_READ
serialDevice.DataReceived += SerialDevice_DataReceived;
#endif
while (true)
{
byte[] txBuffer = UTF8Encoding.UTF8.GetBytes(ATCommand);
int txByteCount = serialDevice.Write(txBuffer);
Debug.WriteLine($"TX: {txByteCount} bytes");
#if SERIAL_SYNC_READ
while( serialDevice.BytesToWrite>0)
{
Debug.WriteLine($" BytesToWrite {serialDevice.BytesToWrite}");
Thread.Sleep(100);
}
int rxByteCount = serialDevice.BytesToRead;
if (rxByteCount>0)
{
byte[] rxBuffer = new byte[rxByteCount];
serialDevice.Read(rxBuffer);
Debug.WriteLine($"RX sync:{rxByteCount} bytes read");
String response = UTF8Encoding.UTF8.GetString(rxBuffer);
Debug.WriteLine($"RX sync:{response}");
}
#endif
Thread.Sleep(20000);
}
}
catch (Exception ex)
{
Debug.WriteLine(ex.Message);
}
}
#if SERIAL_ASYNC_READ
private static void SerialDevice_DataReceived(UartController sender, DataReceivedEventArgs e)
{
byte[] rxBuffer = new byte[e.Count];
serialDevice.Read(rxBuffer, 0, e.Count);
Debug.WriteLine($"RX Async:{e.Count} bytes read");
String response = UTF8Encoding.UTF8.GetString(rxBuffer);
Debug.WriteLine($"RX Async:{response}");
}
#endif
}
When I first ran the code I noticed the serialDevice.Read timed out before any characters were received.
The thread '<No Name>' (0x2) has exited with code 0 (0x0).
devMobile.IoT.Rak811.ShieldSerial starting
TX: 12 bytes
TX: 12 bytes
RX sync:19 bytes read
RX sync:OK V3.0.0.13.H.T3
TX: 12 bytes
RX sync:19 bytes read
RX sync:OK V3.0.0.13.H.T3
TX: 12 bytes
RX sync:19 bytes read
RX sync:OK V3.0.0.13.H.T3
I then added code to check the message had been sent and the code worked as expected. I now think, that rather than checking that the characters had been sent the short 100mSec delay was more important.
The thread '<No Name>' (0x2) has exited with code 0 (0x0).
devMobile.IoT.Rak811.ShieldSerial starting
TX: 12 bytes
BytesToWrite 10
RX sync:19 bytes read
RX sync:OK V3.0.0.13.H.T3
TX: 12 bytes
BytesToWrite 10
RX sync:19 bytes read
RX sync:OK V3.0.0.13.H.T3
TX: 12 bytes
BytesToWrite 10
RX sync:19 bytes read
RX sync:OK V3.0.0.13.H.T3
I then added code to receive data asynchronously and the response to the version request was received as expected.
The thread '<No Name>' (0x2) has exited with code 0 (0x0).
devMobile.IoT.Rak811.ShieldSerial starting
TX: 12 bytes
RX Async:1 bytes read
RX Async:O
RX Async:8 bytes read
RX Async:K V3.0.0
RX Async:10 bytes read
RX Async:.13.H.T3
TX: 12 bytes
RX Async:1 bytes read
RX Async:O
RX Async:5 bytes read
RX Async:K V3.
RX Async:9 bytes read
RX Async:0.0.13.H.
RX Async:4 bytes read
RX Async:T3
