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when i send it will show "Resource temporarily unavailable"

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
25/100
Issue type
Bug
Clarity
Needs clarification
Activity status
Stale
Tech stack
cpp
Domain
networking

Research direction

Start by reproducing the req/resp example with the shown Reqer.send, Reqer.recv, Resp.recv, and Resp.send calls, noting the libzmq version and Windows/Ubuntu setup. Check the return behavior around the reported error and whether the blocking flags match the observed calls. Done means determining whether this is a cppzmq binding bug or an issue in the example, with a minimal reproducible case.

Written by the indexing model from the issue text.

Description

Hello. i'm using req/resp.

Env

it works on windows10 (req) & Ubuntu Port Binoic (Resp) (armv8)
the same code is worked on yesterday .but now it does not work.
,the zppzmq version is same 425

Problem

when i send ,it return "Resource temporarily unavailable"
all device

Code

protobuf script

https://paste.ubuntu.org.cn/4545606

Req


zmq::context_t context(1);

zmq::socket_t  Reqer(context, zmq::socket_type::req);


void NetServer::TNetStart(u_short *port)
{
    //CLog netlog = Settings::GetInstance()->Logger_NetWork;
    
    auto Req
        = std::make_shared<NetMsg::ReqHeader>();

    auto Cor
        = std::make_shared<NetMsg::PubSub_Coordinate>();
    //spy all events
    

    std::cout << std::get<0>(zmq::version()) << std::endl;
    std::cout << std::get<1>(zmq::version()) << std::endl;
    std::cout << std::get<2>(zmq::version()) << std::endl;
   // netlog.printf("[%s:%d]NetServer::TNetStart zmq->subscriber", __FILE__, __LINE__);
    //netlog.printf("binding local 1025");
    try
    {
        Reqer.connect("tcp://192.168.191.2:1025");
    }
    catch (const std::exception& e)
    {
        // the connect is successful
        std::cout << "err:" << e.what() << std::endl;
    }
    
    //netlog.printf("connecting remote tcp://192.168.191.2:1025");
   // netlog.printf("waiting info (loop)");
    while (true)
    {
        
        zmq::message_t recvmessage;
        zmq::message_t sendmessage;
        
        // this is protobuf .i thought it is good
        Req->set_cmd_code(0);
        Req->set_cmd_dat_len(0);
        Req->set_cmd_type(NetMsg::MsgType::Dat);

        sendmessage.rebuild(Req->ByteSizeLong());
        Req->SerializeToArray(sendmessage.data(), sendmessage.size());

        
        Reqer.send(sendmessage, zmq::send_flags::none);// it print "Resource temporarily unavailable"!!!!!!!!!!!!!!!!
       
        Reqer.recv(recvmessage, zmq::recv_flags::none);

        Cor->ParseFromArray(recvmessage.data(), recvmessage.size());

        Settings::GetInstance()->SetRobotAtt(Robot1, Cor->ix(), Cor->iy(), Cor->iyaw());


        Sleep(1);

    }
}

resp



// it works on a non-blocking thread 
void NetDispatch()
{
    auto pReqHeader
        = std::make_shared<NetMsg::ReqHeader>();
        
    auto pCorInfo = std::make_shared<NetMsg::PubSub_Coordinate>();
    std::cout << "bind 1025\r\n" ;
    Resp.bind("tcp://*:1025");
        std::cout << std::get<0>(zmq::version()) << std::endl;
    std::cout << std::get<1>(zmq::version()) << std::endl;
    std::cout << std::get<2>(zmq::version()) << std::endl;
    while(true)
    {
        zmq::message_t recvmsg;
        
        std::cout << "waiting \r\n" ;
        Resp.recv(&recvmsg);
        printf("%s\r\n",zmq_strerror(zmq_errno()));// it print "Resource temporarily unavailable"!!!!!!!!!!!!!!!!
        std::cout << "recv \r\n" ;
        pReqHeader->ParseFromArray(recvmsg.data(),recvmsg.size());
        //pReqHeader->PrintDebugString();

        pCorInfo->set_ix(g_Pose.iX);
        pCorInfo->set_iy(g_Pose.iY);
        pCorInfo->set_iyaw(g_Pose.iYaw/10.f);

        //pCorInfo->PrintDebugString();
        zmq::message_t message(pCorInfo->ByteSizeLong());
        pCorInfo->SerializeToArray(message.data(),pCorInfo->ByteSizeLong());
        pCorInfo->PrintDebugString();
        Resp.send(message);
        
        usleep(20000);
    }


}

%%

i thought i does not require it work on non-block.
so i can't understand this problem . maybe this is bug!

Dominant language
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