[Feature Request]: configurable syncword and new RDEF for regions G and G1 (ISM 863-870 MHz band)

[donsez]

Platform

other, Cross-Platform

Description

1. Make syncword configurable enables to integrate Meshtastic nodes into private or public LoRaWAN networks (0x12 for private ones or 0x34 for public ones). So LoRa gateways (with SX1301/2/3) can listen Meshtastic frames on 125KHz radio channels with SF from 12 to 5 and participate to the repeating. Note, the network can also include Chirsptack Mesh gateways https://www.chirpstack.io/docs/chirpstack-gateway-os/use/chirpstack-gateway-mesh.html

2. Add two new RDEF for subbands G and G1 in ISM 863-870 MHz band in order to ensure the respect of the ISM regulations when the Meshtastic nodes into an LoRaWAN networks (LoRaWAN endpoints trasmit on )

Into src/mesh/RadioLibInterface.h

...
// Subband g (863.0 - 868.0 MHz): 1% 14 dBm max
RDEF(EU_868_G, 863.0f, 868.0f, 1, 0, 14, false, false, false),
// Subband g1 (868.0 - 868.6 MHz): 1% 14 dBm max
RDEF(EU_868_G1, 868.0f, 868.6f, 1, 0, 14, false, false, false),
// Subband g3 (869.4 - 869.65 MHz): 10% 27 dBm max
RDEF(EU_868, 869.4f, 869.65f, 10, 0, 27, false, false, false),
…

Note: I have already tested the proposal with this board including a SX1303 module (RAK5134, WM1302, Nebra SX1303 …) https://github.com/csu-grenoble/flatsat/tree/main/Hardware/Thingsat_INISAT

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