Subscribe via trigger
Kees Schollaart edited this page Apr 15, 2018
·
5 revisions
- Add the
MqttTriggerAttribute
to one of your functions parameters - Use one of the constructor overloads to configure
- The first/simple constructor only requires one or more topic-names (eg: "my/topic/#")
- The second (more advanced) constructor requires a Type which you then have to implement more on this
- Make sure the type of the parameter is
IMqttMessage
This an example of a Function triggered by messages published on the "testtopic/in" topic using the simple constructor:
[FunctionName("SimpleFunction")]
public static void SimpleFunction(
[MqttTrigger("testtopic/in")]IMqttMessage message,
ILogger logger)
{
var body = message.GetMessage();
var bodyString = Encoding.UTF8.GetString(body);
logger.LogInformation($"{DateTime.Now:g} Message for topic {message.Topic}: {bodyString}");
}
The connection to the MQTT broker is made when the function boots. Internally this is implemented using MQTTNet's Managed Client which manages the connections state.