Olaf Bergmann 7872a80fb4 network I/O: fixed socket creation for multicast communication ...

This bugfix allows clients to send datagrams to IP multicast groups.
After introducing the concept of client sessions, datagram sockets
have been connected to their remote peer in coap_socket_connect_udp().
As this operation fails for multicast addresses, sending to multicast
groups was not possible anymore.

coap_socket_connect_udp() now checks whether the given server address
is a multicast address. If this is the case, connect() is not called
and the flag COAP_SOCKET_MULTICAST is set in the coap_socket_t
structure while COAP_SOCKET_CONNECTED is cleared.

The flag COAP_SOCKET_CONNECTED is now set by coap_socket_connect_udp()
and coap_socket_connect_tcp1().

coap_read_session() now allows reading from sockets that have either
the flag COAP_SOCKET_CONNECTED or COAP_SOCKET_MULTICAST set.

2018-02-28 15:44:32 +01:00

..

coap

network I/O: fixed socket creation for multicast communication

2018-02-28 15:44:32 +01:00