Expected Behavior

According to both MQTT specs, the Keep Alive value should be an integer from 0 to 65,535. A non-zero value indicates the number of seconds between messages before the client must send a pingreq; a value of 0 disables the keep-alive mechanism.

Current Behavior

Attempting to set a keep-alive value of less than 5 seconds fails with the output 'Keep alives should be >= 5 secs'. This makes it impossible to set a 0 value, or to use shorter intervals for testing/time-sensitive applications.