BCL programming tips

RTP decoding

• using LINK

RTP streaming

• MP3 bit reservoir

Audio handling

• reading/writing must happen in "real time"

Tips for writing efficient programs

• use ON var GOTO
• do not use large if then or nested if then

UDP reception

• lastlen trick
• must proceed all UDP packets in the handler

Multicast

BCL supports up to 16 IP multicast groups at a time. The subscription, periodic membership reporting as well as group leaving is performed automatically by the firmware and does not have to be handled by the BCL application. IGMP version 1 and 2 is supported.

Subscribing to a group

To subscribe to a multicast group enter the desired multicast address to the UDP open statement.

Example:

OPEN "UDP:224.10.1.3:5000" as 1

Leaving the group

The group is automatically left if the respective handle is closed:

CLOSE 1

UDP source/destination ports

• source port is the same as the port in the open statement