Why OpenAndBindUnicastOutputSocket needs bind()

[advancenXX]

For OutputSocket, i think it is to send socket, why we need bind() here?

[advancenXX]

we get log as below and find the error is [Address already in use]，

W fastdds : [Warning]Cannot create send resource for endpoint remote locator (01.0f.0a.f5.cb.4a.6d.12.01.00.00.00|0.1.0.c2, UDPv4:[239.255.0.1]:7650) -> Function createSendResources

[advancenXX]

Misunderstand the code.
239.255.0.1:7650 is the REMOTE locator, and the port already in use means to bind a source port to send data to remote endpoint.
We set a wrong port through descriptor->m_output_udp_socket.