Re: [mosquitto-dev] Throttling for outgoing messages from bridge

[ajaydinakaran16@xxxxxxxxx]

Hi Roger ,
 Yes , max_inflight_messages property value is not getting honored when connection drops and comes back. We are using MQTTV5 protocol connecting to the Hive MQ broker and expecting to control the number of concurrent messages which are getting published (Qos 2) once connection is back online. 
For instance , if we have 100 messages which are yet to be published to the bridge broker. It’s needs to first send  20 at once and then process the next set if the max_inflight_messages is set to 20 once connection resumes.
Let me know if this could be possible in future.

Sent from my iPhone

> On Apr 29, 2022, at 8:50 PM, Roger Light <roger@xxxxxxxxxx> wrote:
> 
> Hi Ajay,
> 
> Bridges are governed by the max_inflight_messages option as well. This
> only limits the maximum number/quota of QoS 1 or QoS 2 messages that
> are in flow at once, so it's not strictly a throttle but does have
> that effect. In general flow control works much better on MQTT v5
> because both sides can inform each other about the inflight quota
> values they support. One aspect that I'm not sure about is the message
> rate when the bridge is originally brought up and the retained
> messages are sent, or likewise when the connection drops and
> reconnects. I'm not 100% sure that the messages are throttled in that
> case.
> 
> For QoS 0, messages will be delivered as fast as they are received,
> unless the number of outstanding messages reaches the limit of
> max_queued_messages, at which point further messages are dropped.
> 
> Do you have a particular view on how you'd like throttling to work for you?
> 
> Regards,
> 
> Roger
> 
>> On Fri, 29 Apr 2022 at 08:27, ajay dinakaran <ajaydinakaran16@xxxxxxxxx> wrote:
>> 
>> Hi Team,
>>   We would like to control the number of concurrent publish which happen from the bridge to the cloud broker. We see the "max_inflight_messages " property is working for the clients connecting to the mosquitto only. Is there any plans to bring in a feature to support throttling for the outgoing messages from the Bridge?
>> 
>> Regards,
>> Ajay.D
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