To support AS923-2 and AS923-3

[IoTThinks]

Hi all,
I want to help to add in some codes to support AS923-2 and AS923-3 in this project.
Basically, the only difference between AS923 and AS923-2/3 is the two main frequencies.

AS923-1 represents the original AS923 plan; AS923-2 shifts the plan down 1.8MHz to support Indonesia and Viet Nam; AS923-3 shifts the plan down 6.6MHz to support Philippines, Cuba as well as many European and EU-style regulatory domain countries.
https://lora-alliance.org/resource_hub/rp2-101-lorawan-regional-parameters-2/

So I think we should inherit the code from AS923 as much as possible instead of creating totally new bandplans AS923-2 and AS923-3.
Any idea how we can add in AS923-2/3 into this project?

Thanks a lot and have a good day.

[terrillmoore]

It appears that you can hack it by editing the frequencies in lorabase_as923.h:

arduino-lmic/src/lmic/lorabase_as923.h

Lines 56 to 65 in 8d378ea

	// Bands:
	// g1 : 1% 16dBm
	// freq band datarates
	enum {
	AS923_F1 = 923200000, // g1 SF7-12
	AS923_F2 = 923400000, // g1 SF7-12
	AS923_FDOWN = 923200000, // (RX2 freq, DR2)
	AS923_FBCN = 923400000, // default BCN, DR3
	AS923_FPING = 923400000, // default ping, DR3
	};

Just add the offsets to those frequencies as listed.

If one wants to dynamically configure at compile time, perhaps (following as923jp), use the country code to define the offset, then add it in the right places.

[IoTThinks]

Yah, so I will try to add country code VN for as923 instead of new band plan.

I will offset 1.8Mhz for Vietnam.
Thanks a lot.