Mqtt heartbeat has small bug

[koffienl]

Only on startup a heartbeat is published.
Original code:

    if (mqttClient.connected())
    {
        if (mqttenabled == 1)
        {
            if ((unsigned)now() >= nextbeat)
            {
                mqtt_publish_heartbeat(now());
            }
            nextbeat = (unsigned)now() + interval;
        }
    }

This code will extend the nexbeat every time the loop passes, so now() will never be greater than nextbeat
Move the line to the if:

    if (mqttClient.connected())
    {
        if (mqttenabled == 1)
        {
            if ((unsigned)now() >= nextbeat)
            {
                mqtt_publish_heartbeat(now());
                nextbeat = (unsigned)now() + interval;
            }
        }
    }

[omersiar]

This is already fixed on the dev branch, thank you for the feedback.