Hi, I'm doing my thesis on the NS3 environment. I need to integrate it with mqtt. Mqtt provides a (mosquitto) broker / server, and it expects to have clients connect to it. A client could be a publisher (publishes data on the broker) or a subscriber (receives data from the broker it has subscribed to).

SOOOO, i need to have an NS3 node as a publisher client. I have set everything working (Nodes, WiFi, TAP NET device etc) and i do have a connection made to the broker.

THE PROBLEM IS THAT: as soon as the connection is made, and the broker recognizes my NS3 node using my ID "publisher" , the connection is subsequently disconnected, so fast almost in a flash. Here is the output from the mosquitto broker:


1329401026: New connection from 191.13.13.2.
1329401026: New client connected from 191.13.13.2 as publisher.
1329401026: Socket read error on client publisher, disconnecting.


I have delved into the broker code and the error seems to be coming from the file: - loop.c in function 'loop_handle_reads_writes() at if(mqtt3_net_read(db, i)) line 267'
- or then from mosquitto.c after pselect() at point if(mqtt3_net_read(contexts[i]) line 280.

I DO NOT EXPLICITELY CLOSE my NS3 node socket after opening it. I am using an altered version of bulk-send-application.cc to include capability to also receive data from a server, and then i create a custom mosquitto namespace to add the mosquitto client functions which i will call from the bulk-send-applicaiton.cc.

WHY IS THE BROKER ACCEPTING MY CONNECTION, RECEIVES MY INFORMATION I SEND TO IT, SINCE IT DISPLAYS MY ID ('publisher'), THEN ALMOST IMMEDIATELY DISCONNECTS ME WITH A SOCKET-READ-ERROR WHILE I HAVE NOT EXPLICITELY CLOSED MY NS3 SOCKET ?