JohanV

Hello I'm trying to interface the ESP8266 WiFi with AT commands.

Also any one intresting in WiFi for the Netduino,

( better just buy the new Netduino 3 with out of the box Wifi !!!  )

At the moment i'm using the module, with this firmware (0018000902-AI03).

At 9600 bit ps.

most functions are working now.

my problem is the ESP 8266 only have 256 byte buffer. so to read the 256 byte buffer ( 2048 bit. ).

after about 200 ms you start to loose data.

At the moment i spend quite some time to get me familiar to the .net micro framework serial port.

The serial port is read with an interupt.

This interupt is started in a new thread. so this is triggered after some data is recieved.

somtimes 2 bytes somtimes 10 or more.

serialPort.DataReceived += new SerialDataReceivedEventHandler(DataReceived_Interrupt);

serialPort.ErrorReceived += new SerialErrorReceivedEventHandler(ErrorReceived_Interrupt);

Also at first i did not have an Error Revieved interrupt, and was unable to find the problems i had with this module.

turns out it's an buffer input overflow. ( 256 bytes max ).

I changed the handling of the recieved data, and turns out, my approach is to slowy ( or the neduino ? ). For this module.

I'm using some string functions that i suspect are to slowly ?

static System.String sRecieveData = "";

static SerialPort serialPort;

//* Data reception interrupt handler */

internal void DataReceived_Interrupt(object com, SerialDataReceivedEventArgs arg)

{

  byte[] bytes = new byte[serialPort.BytesToRead];

  // read the bytes

  serialPort.Read(bytes, 0, bytes.Length);

  // convert the bytes into a string

  String strLine = new String(System.Text.Encoding.UTF8.GetChars(bytes, 0, bytes.Length));

  sRecieveData += strLine;

}

/* Data reception interrupt handler */

internal void DataReceived_Interrupt(object com, SerialDataReceivedEventArgs arg)

{

  byte[] buf = new byte[1];

  System.String sRecievePart = "";

  while (serialPort.BytesToRead > 0)

  {

    serialPort.Read(buf, 0, 1);

    sRecievePart += (char)buf[0];

  }

  sRecieveData += sRecievePart;

}

So my question is what is the best way to handle the recieved serial data ? so i not get the buffer overflow error. 

Thanks