Explore how to send and receive structured messages using LoRa with ESP32 devices. Instead of sending simple strings, we use structs to include a MAC address for identification, extraction instructions, and a payload. By using an enum to declare message types and identifying the message type with the first byte (msgType), we eliminate the need to include message length in the transmission.

When developing with the ESP32 or Arduino, using the LoRa.onReceive function requires careful handling due to its operation within an interrupt context. Interrupt Service Routines (ISRs) in the ESP32 have stringent requirements and limitations. Performing complex or time-consuming tasks within an ISR can lead to various issues, including crashes and reboots.

Learn the difference between LoRa and LoRaWAN and how to set up a cost-effective LoRa network with ESP32 devices and transceivers. This guide covers the limitations of a no-gateway setup and provides solutions for timing coordination, avoiding conflicts, and assigning unique identifiers. Includes practical examples and code snippets using the Arduino LoRa library to help you implement your own LoRa network.