Hello,
I have in network two nodes: A transmitter, B receiver.
Node A sends every 1s a message with an acknowledgement
to node B.
After sending about 200 messages node A hangs, stops responding to uart and need to reset it. Node B still works.
When I changed node A to S1 PRO XBP24-DM module VER. 8062 all is ok, it worked all night.
What happens when you flash them with the Point to point 802.15.4 code on them? Why are you using Mesh for a point to point connection? Are you using hardware flow control at all?