opensensors.io as MQTT broker

[tiborb]

Opensensors is a convenient and free way to make the particle data open/public.
The account holder can publish to a topic, topics can be public or private, a public topic can be used by anyone.

Usage in the CLI:

mosquitto_pub -h mqtt.opensensors.io -i <client_id> -t <topic> -u <dusty> -m 'measure and timestamp' -P <your password> 

Use cases:

1. Sensors publish directly to opensensors (permissions must be reviewed)
2. Only dusty publishes to opensensors

Public topic example:
https://opensensors.io/topics/orgs/London-Air-Quality-Network/westminster/westminster-oxford-street

[tiborb]

@mfa The MQTT client for ESP8266 is available at https://github.com/tiborb/ESP8266/blob/master/mqtt_test/mqtt_esp8266.ino

In which sensors-software (arduino) variant should I start integrating it?

[ensonic]

There are some basics already here:
https://github.com/opendata-stuttgart/sensors-software/tree/master/esp8266-arduino/ppd42ns-wificonfig-ppd-sds-dht

[ricki-z]

this is an very old issue. a new version will be published in the next days, needs some more testing by now. this version will have mqtt support.

[ensonic]

I just implemented mqtt support as well :/

ensonic@cb91260

Is this like what you have (which branch?)? Or do you want a PR for this?

It works, but I think the graph feature on opensensors.io is broken (or I haven#t figured how to get graphs from my data). As a general improvement it would be nice to store number in json as numbers and have the units as a separate field (optional).

[ricki-z]

please see #33. We will remove mqtt completely from our firmware.