MQTT C#
Basically all you need can be found here. Tested and it worked with mosquitto
https://github.com/chkr1011/MQTTnet/wiki/Client
here is working sample to send message:
var client = new MqttFactory().CreateMqttClient(); var options = new MqttClientOptionsBuilder() .WithClientId($"HomeMessenger1") .WithTcpServer("192.168.1.10", 1883) .WithCredentials("bud", "%spencer%") //.WithTls() .WithCleanSession() .Build(); System.Threading.CancellationToken cancellationToken; await client.ConnectAsync(options, cancellationToken); var message = new MqttApplicationMessageBuilder() .WithTopic("Home/gate") .WithPayload("H") .WithExactlyOnceQoS() .WithRetainFlag() .Build(); await client.PublishAsync(message, cancellationToken);