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Add default_entity_id to MQTT HA autodiscovery payload (#3970)

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* HA MQTT autodiscovery topic update

Add `default_entity_id` to the HA autodiscovery payload to address a deprecation (warning starting with HA 2025.11 and causing an error starting with HA 2026.4).

If desired, the `object_id` (line 107) can be removed after April 2026.

* Fix whitespace

* Whitespace again

* Whitespace final
This commit is contained in:
Rick Auch
2025-12-29 14:49:41 -06:00
committed by GitHub
parent 2b09ce6e44
commit de4ae71864
1 changed files with 16 additions and 12 deletions
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28
code/components/jomjol_mqtt/server_mqtt.cpp
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@@ -72,13 +72,24 @@ bool sendHomeAssistantDiscoveryTopic(std::string group, std::string field,
std::string topicFull;
std::string configTopic;
std::string payload;
std::string component;
configTopic = field;
if (group != "" && (*NUMBERS).size() > 1) { // There is more than one meter, prepend the group so we can differentiate them
configTopic = group + "_" + field;
name = group + " " + name;
}
}
if (field == "problem") { // Special case: Binary sensor which is based on error topic
component = "binary_sensor";
}
else if (field == "flowstart") { // Special case: Button
component = "button";
}
else {
component = "sensor";
}
/**
* homeassistant needs the MQTT discovery topic according to the following structure:
@@ -87,21 +98,14 @@ bool sendHomeAssistantDiscoveryTopic(std::string group, std::string field,
* This means a maintopic "home/test/watermeter" is transformed to the discovery topic "homeassistant/sensor/watermeter/..."
*/
std::string node_id = createNodeId(maintopic);
if (field == "problem") { // Special case: Binary sensor which is based on error topic
topicFull = "homeassistant/binary_sensor/" + node_id + "/" + configTopic + "/config";
}
else if (field == "flowstart") { // Special case: Button
topicFull = "homeassistant/button/" + node_id + "/" + configTopic + "/config";
}
else {
topicFull = "homeassistant/sensor/" + node_id + "/" + configTopic + "/config";
}
topicFull = "homeassistant/" + component + "/" + node_id + "/" + configTopic + "/config";
/* See https://www.home-assistant.io/docs/mqtt/discovery/ */
payload = string("{") +
"\"~\": \"" + maintopic + "\"," +
"\"unique_id\": \"" + maintopic + "-" + configTopic + "\"," +
"\"object_id\": \"" + maintopic + "_" + configTopic + "\"," + // This used to generate the Entity ID
"\"object_id\": \"" + maintopic + "_" + configTopic + "\"," + // Default entity ID; required for HA <= 2025.10
"\"default_entity_id\": \"" + component + "." + maintopic + "_" + configTopic + "\"," + // Default entity ID; required in HA >=2026.4
"\"name\": \"" + name + "\"," +
"\"icon\": \"mdi:" + icon + "\",";