retain MQTT LWT messages #516
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Retaining will messages allows monitoring agent to receive full info about clients state. Without retaining, the monitoring agent will only be informed about events (connect/connection lost) happening during agent's connection to broker. Any reconnect would cause monitoring agent to lose state.
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doesnt this use too much memory? i assume the espeasy has to store the message temporarely? |
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It uses no memory on ESPEasy. Messages are stored by broker (MQTT server). |
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ah right makes sense.. thanks! |
TD-er
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Oct 18, 2017
Retaining will messages allows monitoring agent to receive full info about clients state. Without retaining, the monitoring agent will only be informed about events (connect/connection lost) happening during agent's connection to broker. Any reconnect would cause monitoring agent to lose state.
Superpiffer
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Feb 22, 2018
* [issue #869] Added 'LWT' to last will topic and improved CPU load See #869 for discussion on Last Will Topic. Also changed the way it tried to reconnect to make it return a lot faster when connection is not (yet) possible and call the PubSubClient::loop() at a much slower pace to reduce CPU usage. (See #847) This higher CPU load was probably introduced when fixing #683. * [MQTT] Fix error reporting success status with longer payloads Applied PR https://github.com/knolleary/pubsubclient/pull/360/files * made MQTT_CALLBACK_SIGNATURE for esp32 functional Applied PR knolleary/pubsubclient#336
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Retaining will messages allows monitoring agent to receive full info about clients state.
Without retaining, the monitoring agent will only be informed about events (connect/connection lost) happening during agent's connection to broker. Any reconnect would cause monitoring agent to lose state.