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To add VN_433 and VN_923 for Vietnam

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This PR is to add VN_433 and VN_923 for Vietnam.

Main document: https://vanban.chinhphu.vn/default.aspx?pageid=27160&docid=204286
In Page 16: https://datafiles.chinhphu.vn/cpp/files/vbpq/2021/10/08-btttt.signed.pdf
The accepted frequencies by Vietnam government is

Item 39: 433.05 - 434.79 MHz <=25 mW ERP
Item 45: 920 - 923 MHz <=25 mW ERP
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IoTThinks.com 2025-07-16 17:55:36 +07:00 committed by GitHub
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src/mesh/RadioInterface.cpp
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@ -169,6 +169,15 @@ const RegionInfo regions[] = {
*/
RDEF(KZ_433, 433.075f, 434.775f, 100, 0, 10, true, false, false), RDEF(KZ_863, 863.0f, 868.0f, 100, 0, 30, true, false, true),
/*
Vietnam
Main document: https://vanban.chinhphu.vn/default.aspx?pageid=27160&docid=204286
Page 16: https://datafiles.chinhphu.vn/cpp/files/vbpq/2021/10/08-btttt.signed.pdf
Item 39: 433.05 - 434.79 MHz <=25 mW ERP
Item 45: 920 - 923 MHz <=25 mW ERP
*/
RDEF(VN_433, 433.05f, 434.79f, 100, 0, 14, true, false, false), RDEF(VN_923, 920.0f, 923.0f, 100, 0, 14, true, false, false),
/*
2.4 GHZ WLAN Band equivalent. Only for SX128x chips.
*/