In order to operate the “Session Traversal Utilities for NAT” (STUN) protocol in SWIFT I first open a NWConnection with a remote STUN server of known remoteIP and remotePort like this:

udpConnection = NWConnection(host: remoteIp!, port: remotePort!, using: .udp)

Then I send and receive some packets. I modify remoteIp and remotePort and then WITHOUT CLOSING THE CONNECTION (in order to keep the same Local Endpoint) I try to modify the Remote Endpoint like this:

udpConnection?.currentPath?.remoteEndpoint = NWEndpoint.hostPort(host: remoteIp!, port: remotePort!)

But I receive following error:

Cannot assign to property: ‘remoteEndpoint’ is a ‘let’ constant.

Even cancelling the current connection:

udpConnection?.cancelCurrentEndpoint()

and restarting it:

udpConnection?.restart()

does not help.

The question is: Why is remoteEndpoint a ‘let’ constant not allowing me to modify it?

Thanks in advance.