The sketch works using a direct, wired connection (RS485).
T received - starting test...
Sending Ping to Ying Node
2226167 TSF:MSG:SEND,201-201-1-200,s=1,c=1,t=24,pt=5,l=4,sg=0,ft=0,st=OK:2226165
But it does not work with my RFM95's, but that is a completely different topic.