Fix Home Assistant group discovery collision between different Zigbee2MQTT instances. https://github.com/Koenkk/zigbee2mqtt/issues/7918

lib/extension/homeassistant.js

@@ -995,7 +995,10 @@ class HomeAssistant extends Extension {
     }
 
     getDiscoveryTopic(config, resolvedEntity) {
-        const key = resolvedEntity.type === 'device' ? resolvedEntity.device.ieeeAddr : resolvedEntity.group.groupID;
+        const key = resolvedEntity.type === 'device' ?
+            resolvedEntity.device.ieeeAddr :
+            `${settings.get().mqtt.base_topic.split('')
+                .map((s) => s.charCodeAt(0).toString()).join('')}_${resolvedEntity.group.groupID}`;
         return `${config.type}/${key}/${config.object_id}/config`;
     }
 

test/homeassistant.test.js

@@ -76,7 +76,7 @@ describe('HomeAssistant extension', () => {
         };
 
         expect(MQTT.publish).toHaveBeenCalledWith(
-            'homeassistant/light/9/light/config',
+            'homeassistant/light/1221051039810110150109113116116_9/light/config',
             stringify(payload),
             { retain: true, qos: 0 },
             expect.any(Function),
@@ -100,7 +100,7 @@ describe('HomeAssistant extension', () => {
          };
 
         expect(MQTT.publish).toHaveBeenCalledWith(
-            'homeassistant/switch/9/switch/config',
+            'homeassistant/switch/1221051039810110150109113116116_9/switch/config',
             stringify(payload),
             { retain: true, qos: 0 },
             expect.any(Function),
@@ -1703,7 +1703,7 @@ describe('HomeAssistant extension', () => {
          };
 
         expect(MQTT.publish).toHaveBeenCalledWith(
-            'homeassistant/light/9/light/config',
+            'homeassistant/light/1221051039810110150109113116116_9/light/config',
             stringify(payload),
             { retain: true, qos: 0 },
             expect.any(Function),