MQTT
IoT.js is supporting MQTT protocol, so it's straight forward to build a bridge:
Example:
Resources:
- https://linuxfr.org/news/nouvelle-carte-oshw-pour-mesurer-la-qualite-de-l-air-interieur#
- https://www.slideshare.net/rzrfreefr/mozillathingsfosdem2019/22
- https://archive.fosdem.org/2019/schedule/event/project_things/
Bridge can be installed on Gateway itself along IoTjs, along MQTT broker:
ssh pi@gateway.local sudo apt-get install mosquittoThen service can be started on boot using this scriptlet:
First set some variables we will use in our script:
unit="rzr-webthing-example-iotjs-mqtt-level" unit='webthing-example' dir="${HOME}/usr/local/opt/$unit" srcdir="${dir}/src/${unit}" exe="$dir/$unit.sh" service="$dir/$unit.service" sudo=sudo url=https://github.com/rzr/$unit branch="iotjs/mqtt/level/master" web_url="https://github.com/rzr/${unit}/tree/${branch}" mqtt_host=localhost mqtt_port=1883 httpd_port=8888 property="level" mqtt_topic="${branch}/${property}" # TODO update with yours json_url="http://localhost:${httpd_port}/" property_url="http://localhost:${httpd_port}/properties/${property}"Create luncher script (keep pasting):
$sudo mkdir -p "$dir" cat<<EOF | $sudo tee $exe && $sudo chmod a+rx $exe #!/bin/sh set -x set -e # TODO: service should wait DCHP answer ip addr show ping -c 1 1.1.1.1 || sleep 10 && echo "warning: offline" curl http://ifconfig.io/all if [ ! -d ${srcdir} ] ; then rm -rf "${srcdir}.tmp" mkdir -p "${srcdir}.tmp" git clone --depth 1 ${url} -b ${branch} "${srcdir}.tmp" mv "${srcdir}.tmp" "${srcdir}" fi make \ -C ${srcdir} \ start \ port="${httpd_port}" \ mqtt_host="${mqtt_host}" \ mqtt_port="${mqtt_port}" \ mqtt_topic="${mqtt_topic}" \ mqtt_topic_key=${mqtt_topic_key} \ #EOL EOFCreate systemd service:
cat<<EOF | sudo tee "$service" [Unit] Description=$unit $branch $property Documentation=${url}/tree/$branch After=network-online.target Wants=network-online.target Before=mozilla-iot-gateway.target [Service] ExecStart=$exe User=pi Restart=always [Install] WantedBy=multi-user.target EOFInstall and start it:
sudo chmod 644 $service sudo systemctl daemon-reload sudo systemctl link $service || sudo systemctl enable $service sudo systemctl enable $unit sudo systemctl daemon-reload sudo rebootIt should be started on boot.
$sudo sync \ && $sudo systemctl status $unit \ || sudo journalctl -u $unit -xe --no-pagerMake sure it is working as expected:
${unit} - $unit Loaded: loaded (.../${unit}.service; enabled; vendor preset: enabled) Active: inactive (dead)Note that some MCU platforms (TizenRT, Arduino) are also supporting MQTT API, so MQTT can be used in device firmware too.
Then it could be a good exercise to port nanomsg to IoT.js, and then make an adapter Addons for moziot Gateway, the other simpler approach is to use nodejs (I can share ported code ask me)
And then next one can try to do a RUST version: