Problem in TCP client - server connection

Legacy Open AT
1

I have two Q2687 modules.
I programmed one of them with the sample application TCP_Server, and the other with the sample application TCP_Client.

the sever gave the following result:

[GPRS]: open: -> DISCONNECTED
[GPRS]: start: -> CONNECTING
[GPRS]: GPRS EVENT SETUP OK (cid=1): GPRS activate
[GPRS]: GPRS EVENT: 27 (cid=1)
[GPRS]: GPRS EVENT ACTIVATE OK (cid=5)
[GPRS]: GPRS: -> CONNECTED
[WIP] new TCPSERVER 0x180c5fa8

while the client gave:

[GPRS]: open: -> DISCONNECTED
[GPRS]: start: -> CONNECTING
[GPRS]: GPRS EVENT SETUP OK (cid=1): GPRS activate
[GPRS]: GPRS EVENT: 27 (cid=1)
[GPRS]: GPRS EVENT ACTIVATE OK (cid=5)
[GPRS]: GPRS: -> CONNECTED
[SAMPLE]: connecting to client 10.70.70.41:2000...
[WIP] new TCPCLIENT 0x180c60dc

As I know the client must send something to the server automatically. but nothing happen at the server side.

then after a while the client closes the TCPCLIENT

[SAMPLE]: Error -986 on socket. Closing.
[WIP] closing TCPCLIENT 0x180c60dc
[GPRS]: GPRS EVENT: 27 (cid=5)

what is that error -986
is there something missing?

please help

working with M2M Studio Ver1.02

2

WIP Error codes are listed in the WIP documentation…

3

This is “connection timeout” error.

Here is code from wip_channel.h file:

typedef enum wip_error_t {
  WIP_CERR_OK = 0,
  WIP_CERR_ABORTED = -1000,
  WIP_CERR_CSTATE,
  WIP_CERR_NOT_SUPPORTED,
  WIP_CERR_OUT_OF_RANGE,
  WIP_CERR_MEMORY,
  WIP_CERR_INTERNAL,
  WIP_CERR_INVALID,
  WIP_CERR_DNS_FAILURE,
  WIP_CERR_RESOURCES,
  WIP_CERR_PORT_IN_USE,
  WIP_CERR_REFUSED,
  WIP_CERR_HOST_UNREACHABLE,
  WIP_CERR_NETWORK_UNREACHABLE,
  WIP_CERR_PIPE_BROKEN,
  WIP_CERR_TIMEOUT,

  WIP_CERR_LAST = WIP_CERR_TIMEOUT
} wip_error_t;

Are you sure that 10.70.70.41 is your q2696-server IP? Is this public IP?

In my operator’s GPRS network and standard APN each of GPRS clients “didn’t see” eachother even they has IP adresses like this:
10.70.70.41 (server)
10.70.70.31 (client)

In my case I must buy additional service - public IP for SIM-card which is supposed to be a server.