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Re: [mosquitto-dev] keep-alive in Mosquitto and in MQTT v5/v3.1.1
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Keep in mind that the value of zero for Keep Alive is a special
indicator to turn it off (i.e. don't use Keep Alive).
So don't think of the specs as saying you can "go down to zero".
Technically, I guess, a 1-sec Keep Alive should be supported, but
practically, this would induce a huge overhead on the broker. If you
had ten thousand clients pinging at that rate, it would be hitting
the broker with 10k msgs/sec just to maintain otherwise quiet
connections.
So you will find that many clients won't let you set a Keep Alive of
less than 5 or 10, and default to something like 30, 45, or 60.
Whether a _client_ is required to support all values 1-65535 is
debatable. Technically, a _broker_ probably should, to be 100%
compliant, but allowing really low values would let some clients put
a large burden on the broker.
Frank
On 9/25/23 09:06, Lemburg, Martin via
mosquitto-dev wrote:
Hello,
May be a naive question, but why I can only
connect with Mosquitto to a broker with a keep-alive greater
or equal to 5, while the protocols allow a zero keep-alive?
That’s all for the beginning.
Best regards
Martin
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