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If no obstacle in 3m, and the RSSI is around -80, I think the antenna is badly tuned. It should be around -60. Can try to do your own antenna....

Generally, you should avoid using GPIO0 and 2 of esp32/esp8266. You should fix your board design instead. I believe the SX127x will trigger a HIGH signal on DIOx of the...

There is no such mathematical equation for the wireless world. However, they are surely related. Local regulation limits the TX Power. Normally up to 25dBm depending on where you live.

There are some calculations. But not an exact caculation as wireless is not a perfect environment. The calculation is only for a perfect no-obstacle environment.

Can view more from this? https://youtu.be/jMFa3AiDbcI

I'm not Sandeep =)) 1. I don't think DIO2 is related. By right, DIO2 is for output. It should be for the chip to signal out the event. However, I...

I am helping him. No problem on that. HopeRF RFM95/96... modules will work. Yes, try the examples (sender and receiveCallback) first to see if the issue happens. Then can try...

Related and solved issue: https://github.com/sandeepmistry/arduino-LoRa/issues/363

For reference: https://github.com/sandeepmistry/arduino-LoRa/issues/307

Try to increase the SPI speed to 8Mhz or above?