Dear all,
I hope you can help me with the following problem:
My task: I want to switch on and off a led-light source using an Arduino 4 Relays Shield (this is what a I currently have in my toolbox) which is mounted on top of a Nucleo F767ZI. I want to control one of the relays remotely by connecting to the Nucleo via telnet (TCP connection).
Done so far:
I have reused the standard mbed example and added the required control commands, see here:
The Problem:
After uploading the compiled code (compiled with online compiler) to the Nucleo I can connect to the board via telnet on port 4001 once (command: telnet 4001). As long as this first connection is in use and not interrupted everything works fine. I can switch the light on and off as often I want. But after I have disconnected via the typical telnet quit (Ctrl+Alt Gr+9, then quit), I cannot reconnect to the device. The device is not available any longer. If I reset the board via the reset button, I can connect to the board again. To circumvent this problem I added the quit command “QUI” to the code that resets the board via NVIC_SystemRestart(); , see here:
if(!strcmp (befehl, "QUI"))
{
srv.close();
NVIC_SystemReset();
} else;
Can you give me some hint what I have to change in my code so that I do not need to perform a system reset after the termination of the telnet connection?
Thanks a lot in advance and best regards.