S allius/issue391 (#392)

* design counter on connection board

* display time of last update and add reload button

* chance `Updated` field to a real button

* Provide counter values for the dashboard

* change background color ot the top branch

- use dark-grey instead of black to reduce the contrast

* change color of counter tiles

* test proxy connection counter handling

* prepare conn-table and notes list building

* remove obsolete menue points

* store client mode for dashboard

* store inverters serial number for the dashboard

* store inverters serial number

* build connection table for dashboard

* add connection table to dashboard

* fix responsiveness of the tiles

* adapt unit tests

* remove test fake code

* increase test coverage, remove obsolete if statement

app/src/infos.py

@@ -838,7 +838,10 @@ class Infos:
     def inc_counter(cls, counter: str) -> None:
         '''inc proxy statistic counter'''
         db_dict = cls.stat['proxy']
-        db_dict[counter] += 1
+        try:
+            db_dict[counter] += 1
+        except Exception:
+            db_dict[counter] = 1
         cls.new_stat_data['proxy'] = True
 
     @classmethod
@@ -848,6 +851,15 @@ class Infos:
         db_dict[counter] -= 1
         cls.new_stat_data['proxy'] = True
 
+    @classmethod
+    def get_counter(cls, counter: str) -> int:
+        '''get proxy statistic counter'''
+        try:
+            db_dict = cls.stat['proxy']
+            return db_dict[counter]
+        except Exception:
+            return 0
+
     def ha_proxy_confs(self, ha_prfx: str, node_id: str, snr: str) \
             -> Generator[tuple[str, str, str, str], None, None]:
         '''Generator function yields json register struct for home-assistant