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MQTT adapter
MQTT adapter provides an MQTT API for sending and receiving messages through the platform.
Configuration
The service is configured using the environment variables presented in the following table. Note that any unset variables will be replaced with their default values.
| Variable | Description | Default |
|---|---|---|
| MF_MQTT_ADAPTER_LOG_LEVEL | MQTT adapter log level | error |
| MF_MQTT_INSTANCE_ID | ID of MQTT adapter instance | |
| MF_MQTT_ADAPTER_PORT | Service MQTT port | 1883 |
| MF_MQTT_ADAPTER_WS_PORT | WebSocket port | 8880 |
| MF_NATS_URL | NATS instance URL | nats://localhost:4222 |
| MF_MQTT_ADAPTER_REDIS_PORT | Redis port | 6379 |
| MF_MQTT_ADAPTER_REDIS_HOST | Redis host | localhost |
| MF_MQTT_ADAPTER_REDIS_PASS | Redis pass | mqtt |
| MF_MQTT_ADAPTER_REDIS_DB | Redis db | 0 |
| MF_MQTT_ADAPTER_ES_PORT | Event stream port | 6379 |
| MF_MQTT_ADAPTER_ES_HOST | Event stream host | localhost |
| MF_MQTT_ADAPTER_ES_PASS | Event stream pass | mqtt |
| MF_MQTT_ADAPTER_ES_DB | Event stream db | 0 |
| MF_MQTT_CONCURRENT_MESSAGES | Number of messages that can be concurrently exchanged | 100 |
| MF_THINGS_URL | Things service URL | localhost:8181 |
| MF_MQTT_ADAPTER_CLIENT_TLS | Flag that indicates if TLS should be turned on | false |
| MF_MQTT_ADAPTER_CA_CERTS | Path to trusted CAs in PEM format |
Deployment
The service is distributed as Docker container. The following snippet provides a compose file template that can be used to deploy the service container locally:
version: "2"
services:
mqtt:
image: mainflux/mqtt:[version]
container_name: [instance name]
ports:
- [host machine port]:[configured port]
environment:
MF_THINGS_URL: [Things service URL]
MF_NATS_URL: [NATS instance URL]
MF_MQTT_ADAPTER_LOG_LEVEL: [MQTT adapter log level]
MF_MQTT_INSTANCE_ID: [ID of MQTT adapter instance]
MF_MQTT_ADAPTER_PORT: [Service MQTT port]
MF_MQTT_ADAPTER_WS_PORT: [Service WS port]
MF_MQTT_ADAPTER_REDIS_PORT: [Redis port]
MF_MQTT_ADAPTER_REDIS_HOST: [Redis host]
MF_MQTT_ADAPTER_REDIS_PASS: [Redis pass]
MF_MQTT_ADAPTER_REDIS_DB: [Redis db]
MF_MQTT_ADAPTER_ES_PORT: [Event stream port]
MF_MQTT_ADAPTER_ES_HOST: [Event stream host]
MF_MQTT_ADAPTER_ES_PASS: [Event stream pass]
MF_MQTT_ADAPTER_ES_DB: [Event stream db]
MF_MQTT_CONCURRENT_MESSAGES: [Number of messages that can be concurrently exchanged]
MF_MQTT_ADAPTER_CLIENT_TLS: [Flag that indicates if TLS should be turned on]
MF_MQTT_ADAPTER_CA_CERTS: [Path to trusted CAs in PEM format]
To start the service outside of the container, execute the following shell script:
# download the latest version of the service
go get github.com/mainflux/mainflux
cd $GOPATH/src/github.com/mainflux/mainflux/mqtt
# install dependencies
npm install
# set the environment variables and run the service
MF_THINGS_URL=[Things service URL] MF_NATS_URL=[NATS instance URL] MF_MQTT_ADAPTER_LOG_LEVEL=[MQTT adapter log level] MF_MQTT_INSTANCE_ID=[ID of MQTT adapter instance] MF_MQTT_ADAPTER_PORT=[Service MQTT port] MF_MQTT_ADAPTER_WS_PORT=[Service WS port] MF_MQTT_ADAPTER_REDIS_PORT=[Redis port] MF_MQTT_ADAPTER_REDIS_HOST=[Redis host] MF_MQTT_ADAPTER_REDIS_PASS=[Redis pass] MF_MQTT_ADAPTER_REDIS_DB=[Redis db] MF_MQTT_ADAPTER_ES_PORT=[Event stream port] MF_MQTT_ADAPTER_ES_HOST=[Event stream host] MF_MQTT_ADAPTER_ES_PASS=[Event stream pass] MF_MQTT_ADAPTER_ES_DB=[Event stream db] MF_MQTT_CONCURRENT_MESSAGES=[Number of messages that can be concurrently exchanged] MF_MQTT_ADAPTER_CLIENT_TLS=[Flag that indicates if TLS should be turned on] MF_MQTT_ADAPTER_CA_CERTS=[Path to trusted CAs in PEM format] node mqtt.js ..
Usage
To use MQTT adapter you should use channels/<channel_id>/messages. Client key should
be passed as user's password. If you want to use MQTT over WebSocket, you could use
Paho client:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/paho-mqtt/1.0.2/mqttws31.min.js" type="text/javascript"></script>
<script type="text/javascript">
var wsbroker = "localhost"; //mqtt websocket enabled broker
var wsport = 443 // port for above
var client = new Paho.MQTT.Client(wsbroker, Number(wsport), '');
client.onConnectionLost = function (responseObject) {
console.log("connection lost: " + responseObject.errorMessage);
};
client.onMessageArrived = function (message) {
console.log("Msg", message.destinationName, ' -- ', message.payloadString);
};
var options = {
timeout: 3,
userName: "<thing_id>", // Replace <:your_thing_id>
password: "<thing_key>", // Replace <:your_thing_key>
useSSL: true,
onSuccess: function () {
console.log("mqtt connected");
// Connection succeeded; subscribe to our topic, you can add multile lines of these
client.subscribe('channels/<channel_id>/messages', {qos: 1}); // Replace <:your_channel_id>
// use the below if you want to publish to a topic on connect
var payload = [
{
"bn":"e35b157f-21b8-4adb-ab59-9df21461c815",
"bt":1.276020076001e+09,
"bu":"A",
"bver":5,
"n":"voltage",
"u":"V",
"v":120.1
},
{
"n":"current",
"t":-5,
"v":1.2
},
{
"n":"current",
"t":-4,
"v":1.3
}
];
var message = new Paho.MQTT.Message(JSON.stringify(payload));
message.destinationName = "channels/<channel_id>/messages"; // Replace <:your_channel_id>
client.send(message);
},
onFailure: function (message) {
console.log("Connection failed: " + message.errorMessage);
}
};
function init() {
client.connect(options);
}
</script>
</head>
<body onload="init();">
</body>
</html>