Arduino GSM library - can't change the TCP port

[brezinapeto]

Please read communication with Quectel :

Currently I work with Arduino GSM Shield with QUECTEL M10 chip. I use standard GSM library (https://www.arduino.cc/en/Reference/GSM) for communication with this shield.
From this point of view it is little bit hard to have some AT log file.

I use M10 as TCP Server.

What I can assume from that GSM library is that after start of the server object :
AT+QILOCIP (then parse received IP)
AT+QILPORT=”TCP”,81
AT+QISERVER

And after some time I want to change port number then I call function from object which will call:
(delay for 1 sec)
+++
(delay for 1 sec)
AT+QICLOSE
And call another function for begin of the new object with different port number 82:
AT+QILOCIP (then parse received IP)
AT+QILPORT=”TCP”,82
AT+QISERVER

Result is, that I still receive messages from port 81 and nothing from 82.

Currently I particularly solve my problem but it is not what I really want.

Regards,
Peter Brezina

Here is answer from Quectel:

So your command sequence should be like below;

What I can assume from that GSM library is that after start of the server object :
AT+QILOCIP (then parse received IP)
AT+QILPORT=”TCP”,81
AT+QISERVER

And after some time I want to change port number then I call function from object which will call:
(delay for 1 sec)
+++
(delay for 1 sec)
*_AT+QISRVC=2
*_AT+QICLOSE
……………….. //you should get “CLOSE OK”
AT+QISSTAT //query the current Server Status
.................. //you should get “ERROR” response

And call another function for begin of the new object with different port number 82:
AT+QILOCIP (then parse received IP)
AT+QILPORT=”TCP”,82
AT+QISERVER
AT+QISSTAT // you should get “S: LISTENNING” response
AT+QILPORT? // you should get “TCP: 82”

At this point client should reconnect to the Server which runs on the module by specifying the new port number as 82.

Looking forward to your reply. Thanks !

Best Regards,
Mehmet Cihangir Field Application Engineer

[brezinapeto]

What I did in my GSM libraries :

void GSM3MobileServerService::stop()
{

    // Review, should be the server?
    /*theGSM3MobileClientProvider->disconnectTCP(local1Remote0, mySocket);
    if(flags & GSM3MOBILESERVERSERVICE_SYNCH)
        waitForAnswer();
    theGSM3MobileClientProvider->releaseSocket(mySocket);*/
    theGSM3MobileServerProvider->disconnectTCPServer(mySocket); //PBR modification
    if(flags & GSM3MOBILESERVERSERVICE_SYNCH)
        waitForAnswer();
    theGSM3MobileClientProvider->releaseSocket(mySocket);
    mySocket = -1;
}

//Disconnect Server main function.   PBR modification
int GSM3ShieldV1ServerProvider::disconnectTCPServer(uint8_t socket)
{
    // id Socket does not really mean anything, in this case we have
    // only one socket running
    theGSM3ShieldV1ModemCore.openCommand(this,DISCONNECTTCP);

    // If we are not closed, launch the command
//[ZZ]  if(theGSM3ShieldV1ModemCore.getStatus()==TRANSPARENT_CONNECTED)
//  {
        delay(1000);
        theGSM3ShieldV1ModemCore.print("+++");
        delay(1000);
        theGSM3ShieldV1ModemCore.genericCommand_rq(PSTR("AT+QISRVC=2"));//PBR modification
        theGSM3ShieldV1ModemCore.genericCommand_rq(PSTR("AT+QICLOSE"));
        theGSM3ShieldV1ModemCore.setStatus(GPRS_READY);
//  }
    // Looks like it runs everytime, so we simply flush to death and go on
    do
    {
        // Empty the local buffer, and tell the modem to XON
        // If meanwhile we receive a DISCONNECT we should detect it as URC.
        theGSM3ShieldV1ModemCore.theBuffer().flush();
        theGSM3ShieldV1ModemCore.gss.spaceAvailable();
        // Give some time for the buffer to refill
        delay(100);
        theGSM3ShieldV1ModemCore.closeCommand(1);
    }while(theGSM3ShieldV1ModemCore.theBuffer().storedBytes()>0);

    theGSM3ShieldV1ModemCore.unRegisterUMProvider(this);
    return theGSM3ShieldV1ModemCore.getCommandError();
}

[agdl]

This issue was moved to arduino-libraries/GSM#1