It took 3 walks to the park due to bugs and unhandled exceptions but it worked!
The python script connects to a node that is left at home. The bot can detect and process a message with the following format:
PST
Com: Meshtastic
Sub: Posting via Meshtastic
Bod: Made a python script to create posts via meshtastic messages. If you can see this, the test worked! Posting from the park with no mobile data ^_^
It will parse the message and create a post. So, as long as I can reach my home’s node I am able to create a post.
According to the SX1261/2 datasheet, the maximum RAW bit rate of this LoRa chip is 62.5 kb/s for 500 KHz bandwidth and spreading factor of 5.
The bit rate is constrained by the spreading factor and the bandwidth. Bandwidth is constrained by law, spreading factor is constrained by design. You can find the details in LoRa™ Modulation Basics, AN1200.22, section 4.
For 250 KHz Lora, you can use the equation to get the theoratical max:
If we set SF = 5, BW = 250,000, bit rate is 39.0625 kb/s for a raw bit stream.
So, I think that the limit of 62.5 kb/s is a safe speed ceiling to consider. I am not sure how you would get 125 kbps using LoRa and current constraints. You could switch the chip to FSK mode and pull at 300 kb/s IF the FSK link is strong enough.