Set alive states to false if the adapter unloaded.

main.js

@@ -390,9 +390,10 @@ class ApcUpsAdapter extends utils.Adapter {
         try {
             this.clearTimeout(this.timeoutId);
             this.clearTimeout(this.availabilityTimeout);
-
+            await this.setAliveStatesToFalse();
             if (this.apcAccess != null && this.apcAccess.isConnected === true) {
                 await this.apcAccess.disconnect();
+                this.apcAccess = null;
                 this.log.info('ApcAccess client is disconnected');
             }
             callback();
@@ -401,6 +402,21 @@ class ApcUpsAdapter extends utils.Adapter {
             callback();
         }
     }
+
+    async setAliveStatesToFalse() {
+        try {
+            if (this.ipAddressStates.length > 0) {
+                for (const ipAddress of this.ipAddressStates) {
+                    const upsId = ipAddress.split('.')[2];
+                    const aliveStateName = `${upsId}.info.alive`;
+                    this.setState(aliveStateName, false, true);
+                }
+            }
+            this.setState('info.connection', false, true);
+        } catch (error) {
+            this.log.error(`Error in setAliveStatesToFalse: ${error}`);
+        }
+    }
 }
 
 if (require.main !== module) {