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Add BR_902, Brazil 902MHz-907.5MHz (#7399)

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As reported by @barbabarros , the Brazilian government has specific support for LoRA[1] across multiple frequencies[2][3].
We currently support Brazil through the ANZ/AU915 band. However, Brazil also has another frequency available for use:
902 - 907.5 MHz , 1W power limit, no duty cycle restrictions

[1]  https://sistemas.anatel.gov.br/anexar-api/publico/anexos/download/a028ab5cc4e3f97442830bba0c8bd1dd 
[2] 
https://informacoes.anatel.gov.br/legislacao/resolucoes/2025/2001-resolucao-772 
[3] https://informacoes.anatel.gov.br/legislacao/atos-de-certificacao-de-produtos/2017/1139-ato-14448#item10

Protobuf patch: https://github.com/meshtastic/protobufs/pull/737

Fixes https://github.com/meshtastic/firmware/issues/3741

Co-authored-by: Austin <vidplace7@gmail.com>
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Tom Fifield 2025-07-23 22:55:17 +10:00 committed by GitHub
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commit 4eb6c9fb8e
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8
src/mesh/RadioInterface.cpp
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@ -67,6 +67,7 @@ const RegionInfo regions[] = {
/*
https://www.iot.org.au/wp/wp-content/uploads/2016/12/IoTSpectrumFactSheet.pdf
https://iotalliance.org.nz/wp-content/uploads/sites/4/2019/05/IoT-Spectrum-in-NZ-Briefing-Paper.pdf
Also used in Brazil.
*/
RDEF(ANZ, 915.0f, 928.0f, 100, 0, 30, true, false, false),
@ -177,6 +178,13 @@ const RegionInfo regions[] = {
*/
RDEF(NP_865, 865.0f, 868.0f, 100, 0, 30, true, false, false),
/*
Brazil
902 - 907.5 MHz , 1W power limit, no duty cycle restrictions
https://github.com/meshtastic/firmware/issues/3741
*/
RDEF(BR_902, 902.0f, 907.5f, 100, 0, 30, true, false, false),
/*
2.4 GHZ WLAN Band equivalent. Only for SX128x chips.
*/