Receiving:
r->h: \1<packet data>\0
Sending:
h->r: \1<packet data>\0
r->h: \2\0
Settings:
h->r:\3<TXMAC>\0
h->r:\4<RXMAX>\0
h->r:\5<CHANNEL>\0
h->r:\6<MACLEN>\0
h->r:\7\0
r->h: \7<UUID>\0