Long range settings

I tried to make settings for long-range, but with bw 31.25kHz, the message wasn't received. Also, I observed that with sf12 bw500kHz works to send and receive packet of data but with small length. If someone knows what settings works for 3km range. Another problem that I observed, if I try to use arduino with radiohead library, at RX the RSSI is around -18dB, and with cpy, is around -50dB at 50cm distance between rx and tx. Sf11 and Sf12 works with 128 preamble length, but the rx lose packets. I have adafruit feather m0 rfm9x lora, and I use 433 MHz.

Start by reviewing the Adafruit_CircuitPython_RFM9x configuration entry points and the reported 433 MHz Feather M0 setup, then compare the stated bandwidth, spreading factor, preamble length, and RSSI observations with the Arduino RadioHead results. Done would require a reproducible diagnosis or a clearly documented configuration that addresses the range and packet-loss reports.

Written by the indexing model from the issue text.