Don't allow multiple instances

custom_components/plejd/config_flow.py

@@ -13,6 +13,8 @@ class PlejdConfigFlow(ConfigFlow, domain="plejd"):
     async def async_step_user(self, info=None):
 
         if info is None:
+            if self._async_current_entries():
+                return self.async_abort(reason="single_instance_allowed")
             return self.async_show_form(
                 step_id="user",
                 data_schema=vol.Schema(

custom_components/plejd/translations/en.json

@@ -1,6 +1,9 @@
 {
     "title": "Plejd",
     "config": {
+        "abort": {
+            "single_instance_allowed": "Only one Plejd instance at a time is currently supported."
+        },
         "step": {
             "user": {
                 "title": "Log in to Plejd",