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802.15.4 OpenThread

VAR-SOM-MX93 OpenThread Overview

VAR-SOM-MX93 SoMs ordered with the WBE option feature an IW612 based tri-radio module that supports Wi-Fi 6, Bluetooth/Bluetooth Low Energy 5.2, and 802.15.4.

The 802.15.4 radio coprocessor is managed by OpenThread. Thread is an IPv6-based networking protocol designed for low-power Internet of Things devices in an IEEE802.15.4-2015 wireless mesh network. OpenThread released by Google is an open-source implementation of Thread.

The OpenThread core runs on the host processor (mx93) and communicates with the 802.15.4 coprocessor via OpenThread Daemon (ot-daemon) through SPI interface. Clients can connect to the ot-daemon UNIX socket and communicate using OpenThread CLI as a protocol.

Configuring ot-daemon

ot-daemon is started with the following command:

ot-daemon "spinel+spi:///dev/spidev1.0?gpio-int-device=4&gpio-int-line=29&gpio-reset-device=4_&gpio-reset-line=4_&spi-mode=0&spi-speed=1000000&spi-reset-delay=500" &

This is done automatically on boot by Variscite's ot-service and the scripts in /etc/openthread on boot. The service can be managed using systemd:

systemctl <start|stop|restart|enable|disable> variscite-ot.service

For example, you can stop and disable the service:

# Stop the service
systemctl stop variscite-ot

# Start the service
systemctl disable variscite-ot

Managing OpenThread using ot-ctl

TODO