MQTTtoRealm

This is a simple proof of concept to act as a middleware console app to take in IOT sensor data via MQTT (act as a broker) and write those messages into MongoDB Atlas using Realm Sync.

Setup

Pre Reqs

• Deploy an Atlas Cluster
• Deploy a Realm App on that cluster
• Have docker installed
• Have a MQTT load generator such as mine or my mobile

Realm Setup

• Turn on Sync Developer Mode
  • Choose the cluster you deployed earlier as the sync target cluster
  • Database is realmvr
  • Schema is in the Realm folder of this repo
• Turn on API Key authentication
• Generate an API Key

Code Setup

• Clone this repo onto a server
• make a .env file: cp sample.env .env
• Edit the .env and replace the values with that of your Realm App ID and the API Key you generated in the previous step
• Run ./build.sh which will start the docker container for you using the above variables

One time initial setup

• If this is the first time running, go back into Realm after the container starts, and disable developer mode
• Disable the anonymous authentication
• In the Atlas cluster you should now see a new DB as setup in the Realm Setup step with a new collection called realmvr and a JSON Schema has been applied to it in Realm.
• Restart your docker container

Execution

• Point your MQTT clients I mentioned above at this now running MQTT broker

Screenshots