Meshtastic LoRa Configuration Options and Regional Settings

The Meshtastic documentation outlines critical LoRa configuration parameters for node operation, emphasizing regulatory compliance. It details settings such as Region, Modem Preset, Max Hops, Transmit Power, Bandwidth, Spread Factor, Coding Rate, and Frequency Offset. A comprehensive table provides region codes, frequency ranges (e.g., US 902.0 - 928.0 MHz), duty cycles, and power limits (e.g., EU433 12 dBm) for numerous countries, including the US, EU, China, and Japan, alongside a 2.4 GHz band option. It explicitly states that devices within a mesh must share identical Region and Modem Preset settings for full communication.

Modem Presets, like LONGFAST (the default), optimize for either speed or range, directly impacting network congestion and message delivery delay. For instance, SHORTTURBO offers the fastest speed and shortest range, while VERYLONGSLOW provides the longest range but is less reliable for mesh formation. The document also highlights specific duty cycle limitations, such as the 10% hourly limit for EU433 and EU_868 regions, and provides command-line interface (CLI) examples for configuring these parameters.