python - ZMQ script - send only one message and wait for full reply -

i'm having problems python script, used control game server ( quakelive) via rcon ( can send commands , executed on server - changing map or password ).

game developers provided such script. written using zeromq library, problem takes commands standard input ( first go queue , sent server ) , when there no commands in stdin, waits them.

and make send / execute 1 command, finish connection , 'go further', i'm pretty new python , zeromq, i'm kinda lost.

this script: https://github.com/marconett/quakelive-docker/blob/master/zmq_rcon.py.

also, deduced testing, server needs send full reply _{( it's 2 lines, 10 )} otherwise gets suspended.

yes.
_{in zeromq reply needed req/rep formal pattern.}

first, let's demystify problem.

zeromq lovely piece of code. it's scaleable formal communication pattern name somehow resembles going on, if respective counterparties strive use such formal behaviour.

having taken line 114, rep/rep being used, req asks , rep has answer ( , req-side has receive / "read" ), before req can send request-message rep-side:

    ...     server_rep = server_ctx.socket( zmq.rep )        # ____________.rep archetype     server_rep.bind( host )                          #                ^ |     ...                                              #                | v     client_socket_1 = client_ctx_1.socket( zmq.req ) # ____________.req archetype     client_socket_1.connect( host )     ...     client_socket_2 = client_ctx_2.socket( zmq.req ) # ____________.req archetype     client_socket_2.connect( host ) 

so, irrespective, whether initial source-data, going sent rep, came stdin, fileio .readline() or zeromq-pattern socket-endpoint, each req-message has re-unlocked rep-message ( on rpc-remote-side, code strives send 1 command server , quit ).

so, server-side code responsible well-designed code, not one.