Added Support for SX1276 LoRa module for long range wireless communication

[jithinbp]

• added support for SX1276 LoRa module. issue Add support for Long range wireless communication in SENSORS #62
• tested the connectivity in an urban environment up to 500 meters.

[mariobehling]

@jithinbp Please don't merge your own commits. Please ask @CloudyPadmal to review. It is also a chance for everyone to learn more about the project.

It is important that devs follow best practices to give everyone a chance to align.

[jithinbp]

@mariobehling Apologies. I'll be including him for future PRs .
I already raised a new PR for a separate issue raised by @viveksb007 , so I don't know if I can undo this though.

[CloudyPadmal]

Alignments can be fixed when this file gets edited in future! 👍

[jithinbp]

Cool. i'm on it.
You can get the modules on AliExpress for as low as $4 - $5 .

[CloudyPadmal]

That's superb! :D I was checking the device in eBay. There are two types I found SPI and TTL! Current implementation is using SPI only right?

[jithinbp]

As long as the underlying chip is SX1276, this library will work. I've used the 434 MHz modules from Dorji (DRF1276) as well as the RA-02 from AI-thinker. There are 868 MHz versions also, and only the right frequency needs to be selected in the code.

[CloudyPadmal]

Seems a complete code for LoRa modules using SPI! 👍 Nice work @jithinbp !

[jithinbp]

Thanks. Complete enough to manage P2P connectivity , but if you look at the massive documentation, it is actually a highly capable chip with advanced features.
Also, if you want to leverage existing commercial LoRaWAN gateways, one has to implement the entire LoRaWAN stack in Python. The LoRa modules from Microchip that use UART communication, and cost 5 times as much , have the LoRaWAN stack built into the firmware.

[hongquan]

You work is great. But next time could you please put more effort in coding style?

[jithinbp]

thanks. will do. I try to keep up with Codacy