Radio.SetTxConfig like GW (P2P)

[JindrichHavel]

We need one LoRa node to be able to send a message to all other nodes. (For a critical situation where the connection with gw/server is lost). For example, a multicast packet as it is normally sent by a gateway.

We think it should be like this:
Radio.SetTxConfig(...)
BANDWIDTH 0 // [0: 125 kHz]
SPREADING_FACTOR 9 // [SF7..SF12]
IQ_INVERSION_ON true
Unfortunately this is probably not enough :-( What else needs to be set?