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CC3220MOD: how to know whether TCP connection is still alive by at command

Leanshaw Zhao
Prodigy 40 points
Part Number: CC3220MOD

Dear TI, 

    I have setup a tcp socket in cc3220 by at command, then HOST can connect to this socket.  But I meet a problem that how to know whether the host is still connected with this session.

I can't find such information from at command manual.   

BRs

Leanshaw Zhao 

  • 0
    TI__Mastermind 22935 points

    Hi Leanshaw,

    If you call recv and it returns 0 it means the socket is closed.

    Jesu

  • 0 in reply to Jesu
    Prodigy 40 points

    Hi Jesu,

    From my test, there are four type of response,  which one means that the socket is closed?

    1. "AT+Recv=1,0,200

    OK

    +recv:1,0,0,

    OK

    "

    2."AT+Recv=1,0,200

    OK

    "

    3. "AT+Recv=1,0,200

    OK

    ERROR: process command,-9

    "

    4."AT+Recv=1,0,200

    OK

    +recv:1,0,2,ls

    OK

    "

    BRs

    Leanshaw

  • 0 in reply to Leanshaw Zhao
    TI__Mastermind 22935 points

    Hi Leanshaw, 

    1,3 and 4 is just data about the socket. First number is the socket descript, then format, length and finally data if any. You can see this yourself in the code.

    Regarding you question, if calling AT+Recv is not enough you can try using AT+send with the same socket. If it is closed you should get an error back. Let me know how that works for you.

    Jesu