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/modbus_tcp.py

@@ -28,10 +28,12 @@ class ModbusConn():
         logging.info(f'[{stream.node_id}:{stream.conn_no}] '
                      f'Connected to {self.addr}')
         Infos.inc_counter('Inverter_Cnt')
+        Infos.inc_counter('ClientMode_Cnt')
         await self.inverter.local.ifc.publish_outstanding_mqtt()
         return self.inverter
 
     async def __aexit__(self, exc_type, exc, tb):
+        Infos.dec_counter('ClientMode_Cnt')
         Infos.dec_counter('Inverter_Cnt')
         await self.inverter.local.ifc.publish_outstanding_mqtt()
         self.inverter.__exit__(exc_type, exc, tb)