Re: Communicatiing with xplHal

[Mal Lansell <mlansell@xxxxxxxxxxxxxx>]

Tony Tofts wrote:

snip

>UDP is connectionless so there won't be any incoming 'connections' only
>'data'
>
>As long as you send a valid config.app or hbeat.app as a broadcast to
port
>3865 then the hub will pick it up and then start relaying messages from
port
>3865 to it from the local ip/locahost on the port specified in port=
>
>
>
I did say it was my first time programming sockets ;-)  UDP sockets
appear to work with connect, but I didn't realise they didn't work with
listen/accept!  I take it the use of broadcast is so I don't need to
know the IP of the hub?

Taking a few hints from what you have said, I did a bit of a search of
MSDN and I think I need to take the following approach:

1) I should change my code to just use sendto (rather than
connect/send), and set the address to broadcast.

2) On the receiving side, I should bind a socket to the local address
and port 50000+, call recv and just wait for data from the hub (rather
than listen/accept).

Hopefully this will work.

Mal