It is pretty hard to understand how to intercept WebSocket traffic with this library. An example would help greatly. Thanks!

Describe the bug

Providing NULL to the send callback of ucp_put_nb leads to a seg. fault.

From looking at the code with @shamisp the problem appears to be that ucp_request_set_callback unconditionally sets UCP_REQUEST_FLAG_CALLBACK.

IpAddresses are not assigned to interfaces unless the module of the type Ipv4 is named "ipv4".

Reproduce

Create a node where the ipv4 submodule is not called ipv4. All interfaces are then not assigned an ip address.

Modified Example from https://inet.omnetpp.org/docs/users-guide/ch-network-nodes.html#custom-network-nodes

//NetworkNodeExample.ned
module NetworkNodeExample
{