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GPRS TCP IP server hangs (M95)

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I managed to establish a TCP IP server using a GSM module Quectel M95.

The poblem I came is that I interogate continously (~2 seconds ,perhaps faster) the server ; the server responds with some data ( less than 10 bytes ) )

after a while the connection is lost;
the PC app I use as the client (the one which sends the request through internet to the m95 module ) does not receive the server's answer anymore, and after a while it says that it can not send the request anymore.

to be able to send again , I have to disconnect and connect again

I think the problem is on the server side; i don t think that the GPRS network would release the connection if there is data flowing through it; my connection get stuck after a while (sometime an hour, sometime 10 minutes; )

the QUESTION : how I (the server) can check the connection and mantain it , without restarting the connection and without any form of heartbeat packet/ping??? ...(because I am a server/slave)
 
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fionut said:
I managed to establish a TCP IP server using a GSM module Quectel M95.

The poblem I came is that I interogate continously (~2 seconds ,perhaps faster) the server ; the server responds with some data ( less than 10 bytes ) )

after a while the connection is lost;
the PC app I use as the client (the one which sends the request through internet to the m95 module ) does not receive the server's answer anymore, and after a while it says that it can not send the request anymore.

to be able to send again , I have to disconnect and connect again

I think the problem is on the server side; i don t think that the GPRS network would release the connection if there is data flowing through it; my connection get stuck after a while (sometime an hour, sometime 10 minutes; )

the QUESTION : how I (the server) can check the connection and mantain it , without restarting the connection and without any form of heartbeat packet/ping??? ...(because I am a server/slave)
Click to expand...

How did you manage to establish a server with this GSM module?:clap::-o

https://www.antrax.de/downloads/gsm-easy!/quectel-application notes/gsm_tcpip_an_v1.1.pdf

In this application notes you can find some methods to maintain a TCP/IP connection, maybe you manage to apply these methods from the server side.
But i can't even establish the server because nothing can connect to it. I mean, i've done exactly the same commands explained in that .pdf and the server goes in listening status, but when i try to connect something (i've tryed with Telnet, modbus scan, hyperterminal...) the module doesn't send any string "REMOTE IP:..." through the uart.:thinker:
I don't really know why, have you any suggestion please?
 

Have you any indications that your mobile internet provider allows inbound TCP/IP connections? Usually they don't.
 
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