Circular buffer 9 bytes for receiving maximum sized packages 2 pointers and a timeout to clear the circular buf too.

buffer size
1 7 4+1(timeout)+1(repetion counter)+1(free)
2 8 5+1(timeout)+1(repetion counter)+1(free)
3 9 6+1(timeout)+1(repetion counter)+1(free)
4 12 9+1(timeout)+1(repetion counter)+1(free)


After power on, the buffers 1 to 4 will be set as free. Once a package is received, then you can store the package in the corresponding buffer size and increment it repetion counter and set a timeout if the buffer is free.

Like this you can do for other package sizes.

The function of a package can be executed after a pre determined no of repetion counter or on timeout.

The above approach is ok as long as the sender do not mix the package lengths.

Also can have buffer 1 size 7 --> 2nos
buffer 2 size 8 --> 2nos
buffer 3 size 9 --> 2nos
buffer 4 size 12 --> 2nos

This depends on the maximum no. of senders at a time and maximum repetion of a package.

V.Nagarajan