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* Commit for mainflux-596 Modified and tested: - cli - http - mqtt - normalizer - all readers - sdk messages - all writers - ws Missing: - coap - lora Signed-off-by: ale <ale@metaverso.org> * - fix subtopic name in, when starting with dot, http/ws/mqtt - add some test on readers Signed-off-by: ale <ale@metaverso.org> * - fix string concatenation - update http/transport regexp to match subtopic names with only \w- - update ws/transport regexp like http ones with also the wildcard * and > Signed-off-by: ale <ale@metaverso.org> * added subtopic support to coap adapter Signed-off-by: ale <ale@metaverso.org> * - update replace functions with replaceall when needed - renamed getDestChannel to fmtSubject - update api/transport and ws/transport route to be more readable - fix mqtt syntax - renamed func andQuery to query as suggested by @anovakovic01 - have a nice we :) Signed-off-by: ale <ale@metaverso.org> * - fix error declaration on ws/nat/publisher - fix regexp added missing allowed chars - and _ on coap/api/transport - fix subtopic clean suffix / if present on coap/api/transport - improve regexp on http and ws /api/transport, now does not accept url that do not strictly match - add some ws subtopic tests Signed-off-by: ale <ale@metaverso.org> * - enabled wildcard chars on coap/api/transport - allow use special chars on http and ws api/transport Signed-off-by: ale <ale@metaverso.org> * - use strings.Replace() insted ReplaceAll() Signed-off-by: ale <ale@metaverso.org> * - allow every chars on subtopics - fix replace error on mqtt Signed-off-by: ale <ale@metaverso.org> * fix cassandra test Signed-off-by: ale <ale@metaverso.org> * fix ws test with invalid subtopic Signed-off-by: ale <ale@metaverso.org> * fix invalid GOCACHE in go1.12, replaced by -count 1, see https://golang.org/doc/go1.10#test Signed-off-by: ale <ale@metaverso.org> * - improve regexp on http/ws api/transport - minor changes Signed-off-by: ale <ale@metaverso.org> * - add generic function parseSubtopic on ws/http adapters Signed-off-by: ale <ale@metaverso.org> * - add generic function fmtSubtopic on coap adapter Signed-off-by: ale <ale@metaverso.org>
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_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_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_ADAPTER_PORT: [Service MQTT port]
MF_MQTT_WS_PORT: [Service WS port]
MF_MQTT_REDIS_PORT: [Redis port]
MF_MQTT_REDIS_HOST: [Redis host]
MF_MQTT_REDIS_PASS: [Redis pass]
MF_MQTT_REDIS_DB: [Redis 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_ADAPTER_PORT=[Service MQTT port] MF_MQTT_WS_PORT=[Service WS port] MF_MQTT_REDIS_PORT=[Redis port] MF_MQTT_REDIS_HOST=[Redis host] MF_MQTT_REDIS_PASS=[Redis pass] MF_MQTT_REDIS_DB=[Redis 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>