The Bodypack uses Bonjour for network service discovery. Bonjour listens on UDP port 5353.
After discovery, the connection is done through two sockets (definition: sockets). The PC will connect to the Bodypack using a TCP socket on port 9226. The PC will then set up a UDP socket on a port in the range 9223-9478 and it will notify the Bodypack to send its Live data to that port.
So to summarize, the connections/ports that a firewall should allow:
Incoming UDP 5353 and 9223-9478
Outgoing TCP 9226