LoRa packets from YoLink sensors

[nijhawank]

YoLink provides a range of smart home sensors that communicate with the hub over LoRa. I sniffed few LoRa packets off the temperature and humidity sensor. I used the following components to do this...

1. https://github.com/rpp0/gr-lora
2. An RTL-SDR

I had to make the following changes to the grc files...

1. Changed the radio frequency to 910.3 (found by scanning the permitted range in USA)
2. Changed the spreading factor to 7

Here are few packets I sniffed every time I pressed the button on the sensor...

 26 31 d0 80 9e c1 05 0b 00 44 01 01 d2 17 b9 d1 f3 05 ee 1c 41 73 14 c4 6b b8 61 cf 7e 76 01 b3 94 7f 39 25 34 e2 ad 12 cc 83 d2 (DAska~v9%4)
 26 31 d0 80 9e c1 05 0b 00 45 01 01 7d f3 2b 99 60 9e f7 4d 05 aa 99 56 2d 8a f6 2f 3d a2 b0 03 fd 5c 53 64 fb d3 f9 3b bd c0 38 (E}+`MV-/=\Sd;8)
 26 31 d0 80 9e c1 05 0b 00 46 01 01 39 7f 17 e6 22 60 80 ac 77 76 fe 4a 0c 6c ac ab 73 a0 6b d2 9c 9b 84 e5 2d ae 67 62 74 ce 07 (F9"`wvJlsk-gbt)
 26 31 d0 80 9e c1 05 0b 00 47 01 01 4b 82 db fb 7e f7 4a 70 43 10 93 ae 14 16 49 45 c5 0b 78 37 3d 5d ff d1 a8 13 cd cf 58 98 12 (GK~JpCIEx7=]X)
 26 31 d0 80 9e c1 05 0b 00 48 01 01 dc c1 b5 38 8c 1f 78 7d bf c6 51 56 c0 eb e8 bd 6d 6b 8b 82 ed cf 3b c9 30 f2 84 08 78 6b dc (H8x}QVmk;0xk)
 26 31 d0 80 9e c1 05 0b 00 49 01 01 b6 a9 f3 e5 09 70 7c 00 a3 bf de b2 30 3e 7e 09 8b 25 49 7e 25 64 75 76 23 7d b4 e0 f1 14 1e (Ip|0>~%I~%duv#})
 26 31 d0 80 9e c1 05 0b 00 4a 01 01 60 8d 48 34 ce c6 52 05 ee 55 c0 ea 16 a0 a5 eb 09 c4 60 a2 1b 88 4c d1 e3 fc 17 72 47 1b 6c (J`H4RU`LrGl)