Can not send udp packet using writeDatagram

Jeffson

Hi,

I have a small udp sending and receiving program to test the communcation with remote server.
after I ran it in qt ceator,I can not get the response from server ,and I can not capture the packet sent by client using wireshark even though the bind and writeDatagram function works fine.

here is the code:
https://drive.google.com/open?id=0Bychq2mXjGSOMVAzOVJVZERtdmc

can anyone download this program and try to run it using QT ceator,and then help me figure out the issue.

Thanks ahead.

jsulm

@Jeffson I tested: writeDatagram does not work: it returns -1 and error() returns QAbstractSocket::NetworkError

Paul Colby

Just at a glance, I think you might need to replace QHostAddress::LocalHost with QHostAddress::AnyIPv4 when you bind the socket?

edit: Yep, just made that one change and it worked for me. Cheers :)

Jeffson

@Paul-Colby wow,you can get the server reply?what is your environment?

Paul Colby

I got:

1
86
Message from:  "75.102.43.54"
Message port:  12345
Message:  "id=1&status=ok&config=mode=decoder,buffer=800,out_gain=+3,dn_relay1=1,ref_id=1078,ref_ip=75.102.43.54,audio_port=55000,time_stamp=1477364862"

My environment:

Linux paul-XPS-13-9343 4.8.0-26-generic #28-Ubuntu SMP Tue Oct 18 14:39:52 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
QMake version 3.0
Using Qt version 5.6.1 in /usr/lib/x86_64-linux-gnu

Cheers.

Jeffson

@Paul-Colby my god,thanks very much,Paul.I have stuck here for 4 days.You saved me.