Return one retained message

[michael-eckhart-woellkart]

Describe the feature request

Return one retained message

Which project is your feature request related to?

• Server

Describe the solution you'd like

Implement new method which only return one method

[michael-eckhart-woellkart]

This would be done by:

MQTTnet\Server\Internal\MqttRetainedMessagesManager.cs

        public Task<MqttApplicationMessage> GetMessage(string topic)
        {
            lock (_messages)
            {
                if (!_messages.TryGetValue(topic, out var message))
                {
                    return Task.FromResult(message);
                }
                else
                {
                    return null;
                }
            }
        }

MQTTnet\Server\MqttServer.cs

        public Task<MqttApplicationMessage> GetRetainedMessageAsync(string topic)
        {
            ThrowIfNotStarted();
            return _retainedMessagesManager.GetMessage(topic);
        }

[chkr1011]

So you basically need an API which lets you get exactly one retained message instead of all?

[michael-eckhart-woellkart]

So you basically need an API which lets you get exactly one retained message instead of all?

Correct :)

[chkr1011]

Please try the code from the branch attached to this ticket or try build 653 from the myget feed. If the code works please let me know. I will then merge the feature.

[michael-eckhart-woellkart]

Work for me.