[mosquitto-dev] Bridging and order of (re)sending of messages

[Richard Duivenvoorde <richard@xxxxxxxx>]

Hi Devs/All,

We have a setup in which a small edge computer with sensor and with 
limited/bad network connection is set to bridge messages (from local 
clients) to a central collection point broker.

The idea is/was that the broker ON the edge computer will be able to 
hold the messages and start (re)sending them to the central collector 
broker when there is a network connection again.

This seems to work nicely! But...

Question: upon a reconnection, the local broker seems to sent the 
messages in the order they were received. Plausible in a lot of 
situations, but in my case we want to have asap the latest known sensor 
value (and we do not mind receiving older message too off course, but we 
are mostly interested in the latest). In this case we will at least have 
the latest values and the computer will not 'waste time/bandwidth' 
sending the older data (note this is in an emergency response setup, 
with mobile sensor cars driving in remote areas with bad g4 
connections).

I could not find a way to configure mosquitto for such an option. Did I 
miss something or should I create a 'feature request' for it? :-)

Would this be of interest for others too, maybe?

Thanks for any input, Regards,

Richard Duivenvoorde