added support for multiple instances

custom_components/jackery/config_flow.py

@@ -35,12 +35,15 @@ class JackeryConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
         self, user_input: dict[str, Any] | None = None
     ) -> FlowResult:
         """Handle the initial step."""
-        if self._async_current_entries():
-            return self.async_abort(reason="single_instance_allowed")
-
         errors = {}
 
         if user_input is not None:
+            # Check for duplicate device SN
+            new_sn = user_input.get("device_sn", "")
+            for entry in self._async_current_entries():
+                if entry.data.get("device_sn") == new_sn:
+                    return self.async_abort(reason="already_configured")
+
             # 检查 MQTT 集成是否已配置
             if not await mqtt.async_wait_for_mqtt_client(self.hass):
                 errors["base"] = "mqtt_not_configured"
@@ -52,7 +55,7 @@ class JackeryConfigFlow(config_entries.ConfigFlow, domain=DOMAIN):
                 )
 
                 return self.async_create_entry(
-                    title="Jackery",
+                    title=f"Jackery {new_sn}",
                     data=user_input,
                 )