I know that I will say the obvious, but if I get this right , there is a raspberry pi at each client and master. There is an easy way to set a batch file that can do a "ping" or other type of network activity said at any given time interval. That would keep a client alive till there is a way to fix this in the radio firmware itself.
This could be a simple udp packet sent so that it wont even need a response back.
A few bytes and it is done.
Guillaume, why do you say that the npr radio's are bad as a back bone system? If you talk about time slots, would it be possible to do a kind of lock to a single mac or radio?the master and each use each ther specific time slots? That protocol make me think of the old token ring systems, ( IEEE 802.5 ) every one could ear every transmission on the network, there was no collision checks as every client or server had a token asigned to them. But if there was only 2 client or server on the same network, and the configuration was done properly, it was pretty fast for the time.
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