Transmit LoRa radio data without a transmitter @CNLohr
The LoLRa project for firmware-only LoRa radio data transmission, for a variety of processors. It can send LoRa packets, without any radio, chips, external hardware or built-in radios at all on a variety of common, inexpensive processors.
While not truly bit banging, the code shows how using either a shift register (i.e. I2S or SPI port) or an APLL, one can send LoRa packets that can be decoded by commercial off the shelf LoRa gateways and other chips.
The files in the project are under multiple licenses, including a no AI training license.
The GitHub repo goes into great detail on how this is accomplished.
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