mqtt-client-simulator

About

This is a simple MQTT client simulator for connecting/disconnecting from HiveMQ broker.

References

• HiveMQ Client Event History
• MQTT

Prerequisites

• node, npm (https://docs.npmjs.com/downloading-and-installing-node-js-and-npm)

Running the application

• Use [npm install] to install dependencies
• Use [npm run dev] to run the application

Application URL

http://localhost:5000/graphql

Queries & mutations

Healthcheck

Can be used to check if the application has successfully started.

Query

query{
  healthcheck
}

Response

{
  "data": {
    "healthcheck": "App sucessfully running!"
  }
}

Connect

Can be used for creating new client connection, if clientId is set to null. Can be used to cause # SESSION TAKEN OVER event by attemting to create new connection with existing clientId. Returns clientId.

Query

mutation($input: MqttClientInput!) {
  connect(input: $input) {
    clientId
  }
}

Input

{
  "input": {
    "clientId": "string" # Optional parameter. 
  }
}

Disconnect

Can be used for ending an existing connection. Takes existing clientId as an input parameter. Returns connected (boolean). Returns false if the client was successfully disconnected.

Query

mutation {
  endConnection(clientId: string) {
    connected
  }
}