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mqtt: send ping at upkeep interval

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Closes #16975
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Christian Schmitz 2025-04-05 13:28:03 +02:00 • committed by Daniel Stenberg
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docs/internals/MQTT.md
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@ -26,6 +26,10 @@ Example subscribe:
This sends an MQTT SUBSCRIBE packet for the topic `bedroom/temp` and listen in
for incoming PUBLISH packets.
You can set the upkeep interval ms option to make curl send MQTT ping requests to the
server at an internal, to prevent the connection to get closed because of idleness.
You might then need to use the progress callback to cancel the operation.
### Publishing
Command usage: