Per https://dvswitch.groups.io/g/HBlink/message/2616

Unhandled Error
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/twisted/python/log.py", line 86, in callWithContext
return context.call({ILogContext: newCtx}, func, *args, **kw)
File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 122, in callWithContext
return self.currentContext().callWithContext(ctx, func, *args, **kw)
File "/usr/lib/python3/dist-packages/twisted/python/context.py", line 85, in callWithContext
return func(*args,**kw)
File "/usr/lib/python3/dist-packages/twisted/internet/posixbase.py", line 614, in _doReadOrWrite
why = selectable.doRead()
--- <exception caught here> ---
File "/usr/lib/python3/dist-packages/twisted/internet/udp.py", line 249, in doRead
self.protocol.datagramReceived(data, addr)
File "/opt/hblink3/hblink.py", line 603, in peer_datagramReceived
self.dmrd_received(_peer_id, _rf_src, _dst_id, _seq, _slot, _call_type, _frame_type, _dtype_vseq, _stream_id, _data)
File "./bridge_all.py", line 130, in dmrd_received
if _seq > (self.STATUS[_slot]['RX_SEQ'] + 1):
builtins.TypeError: can't concat int to bytes

There's a need for int.from_bytes() here, but we should look at the entirety of the code to make sure we're not just throwing duct tape on the problem.