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
How to get more variables
The current BCL interpreter supports only up to 96 integer and string variables. In complex programs this can be a significant limitation. You can increase the actual number of integer variables in the program by using integer arrays.
