arduino-LoRa VS lora-pasture-pump

I'm simply trying to send a message back and forth. Problem is documentation for these things suck. I found this website https://robotzero.one/heltec-wifi-lora-32/ that is for the 2.0 version. It claims I can use this LORA library ( GitHub - sandeepmistry/arduino-LoRa: An Arduino library for sending and receiving data using LoRa radios. )

Your network, your rules. You can use whatever radio parameters you want, and you can use a frequency not used by popular LoRaWAN networks.TTN does not use great parameters for long range anyway. I use https://github.com/sandeepmistry/arduino-LoRa library its easy enough to use and understand. https://github.com/jgromes/RadioLib is good but a bit more complex to implement.

I am currently working on a Lora library for the Raspberry Pi Pico. I am using the Pico SDK with C++ and not the Arduino Framework. I'm trying to port the official Lora library for Arduino. Unfortunately, I fail at the Lora.print() function which is used to print the packages, because it is an overloaded function and I can't seem to find the right source code. Unfortunately, the documentation of my Lora chip (SX1276) is not very good, and I don't recognize which values I have to write in which register to actually send a message. This is my current code base.

Yes, you need two LoRa transceivers. There are a bunch of settings including frequency, spreading factor, bandwidth, coding rate, preamble length and sync word that need to match. Read the documentation.

You should send a pull request fixing the documentation for the next person!

You should probably check out LoRA modules. They should be able to achieve >10 km range (under thr right conditions), are reasonably priced and have good library support (e.g. https://github.com/sandeepmistry/arduino-LoRa ). Most of them communicate via SPI or I2C though, so no RX/TX pins.

You might also choose to just drop the packets into your own MQTT server and ignore LoraWAN altogether. That's what I've done here with a single channel gateway that publishes a topic via MQTT, then I can use that topic over in NodeRed or Home Assistant. This also communicates between a trough and pump for water calls when the trough gets low. Nothing leaves the network.

If you want a starting point, take a look at https://gitlab.com/ikidd/lora-pasture-pump

I built a very rudimentary gateway you might be able to use here. It's only one-way at this point, publishing to MQTT, but there is the start of the code process in there to make it two-way.

Something like the OnReceive subroutine in this. So the trough forms a json message with an address at the start that the pump reads in. If the address matches what it thinks it's own address is for, it kicks off some actions. It will also send a 0xFF message for updating MQTT through the gateway.

I built this as a self-contained lora to lora system with an MQTT gateway in order to display data via Nodered on a raspberry pi. The lora device communicate with each other to initiate a pumping system, and both lora nodes send back to a gateway that publishes certain data to MQTT.