MQTT: Difference between revisions
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My MQTT Server is in a docker container on [[Bellman]]. | My MQTT Server is in a docker container on [[Bellman]]. | ||
I set up a Docker image of eclipse-mosquitto on [[Bellman]]. | |||
I can log into it and run commands to learn more. | |||
sensors/thermostat/start | |||
sensors/thermostat/stop | |||
sensors/thermostat/temperature | |||
sensors/thermostat/setpoint | |||
# julie arrived | |||
# julie left | |||
Listen for presence messages from anyone. QOS is set to 'at least once'. -d is for debug | |||
docker exec -it mosquitto mosquitto_sub -t 'sensors/+/presence' -q 1 -d | |||
Send a message. | |||
docker exec -it mosquitto mosquitto_pub -t 'sensors/unifi/presence' -q 1 -d -m 'Julie arrived' | |||
How should my messages look? | |||
presence/SENSOR/NEWSTATE | |||
where SENSOR = {unifi|dnsmasq} and NEWSTATE = {arrived|departed} | |||
and the payload is one of ACTOR = {Julie|Brian|Unknown} | |||
The publisher will translate input from the sensor (Unifi in this case) to the actor value (Julie or Brian). | |||
The subscribers don't usually need to know if the sensor was a phone or a facial recognition camera or RFID or... | |||
Some subscribers (the thermostat) don't care who the actor is, just whether or not anyone is home. | |||
[[Category: IoT]] | [[Category: IoT]] | ||
Revision as of 02:42, 4 January 2020
I'm looking at MQTT right now in the context of Presence Detection.
There are some good books in Safari including "Hands-on MQTT Programming With Python".
My MQTT Server is in a docker container on Bellman.
I set up a Docker image of eclipse-mosquitto on Bellman. I can log into it and run commands to learn more.
sensors/thermostat/start sensors/thermostat/stop sensors/thermostat/temperature sensors/thermostat/setpoint
- julie arrived
- julie left
Listen for presence messages from anyone. QOS is set to 'at least once'. -d is for debug
docker exec -it mosquitto mosquitto_sub -t 'sensors/+/presence' -q 1 -d
Send a message.
docker exec -it mosquitto mosquitto_pub -t 'sensors/unifi/presence' -q 1 -d -m 'Julie arrived'
How should my messages look?
presence/SENSOR/NEWSTATE
where SENSOR = {unifi|dnsmasq} and NEWSTATE = {arrived|departed}
and the payload is one of ACTOR = {Julie|Brian|Unknown}
The publisher will translate input from the sensor (Unifi in this case) to the actor value (Julie or Brian). The subscribers don't usually need to know if the sensor was a phone or a facial recognition camera or RFID or... Some subscribers (the thermostat) don't care who the actor is, just whether or not anyone is home.
