Improve grid-meter disconnect or parse error, stop ess

dbus-node-red-grid-meter/grid_meter.py

@@ -68,19 +68,35 @@ class NodeRedMetergrid-meter:
     
     return int(value)
   
+  # if there is a grid meter disconnect or some other error, set mandatory values to None to stop ESS and set MPs to passthrough
+  def _errorState(self):
+    self._dbusservice['/Connected'] = 0
+    self._dbusservice['/Ac/Power'] = None
+    self._dbusservice['/Ac/Current'] = None
+    self._dbusservice['/Ac/L1/Voltage'] = None
+    self._dbusservice['/Ac/L2/Voltage'] = None
+    self._dbusservice['/Ac/L3/Voltage'] = None
+    self._dbusservice['/Ac/L1/Current'] = None
+    self._dbusservice['/Ac/L2/Current'] = None
+    self._dbusservice['/Ac/L3/Current'] = None
+    self._dbusservice['/Ac/L1/Power'] = None
+    self._dbusservice['/Ac/L2/Power'] = None
+    self._dbusservice['/Ac/L3/Power'] = None
+    return True
+  
   def _getNodeRedData(self):
     URL = "http://localhost:1880/meters"
     try:
         meter_r = requests.get(url = URL, timeout=5)
     except requests.exceptions.RequestException as e:
-        self._dbusservice['/Connected'] = 0
+        self._errorState()
         raise ConnectionError("No response from NodeRed - %s" % (URL))
        
     meter_data = meter_r.json()     
     
     # check for Json
     if not meter_data:
-        self._dbusservice['/Connected'] = 0
+        self._errorState()
         raise ValueError("Converting response to JSON failed")
     
     self._dbusservice['/Connected'] = 1
@@ -133,6 +149,7 @@ class NodeRedMetergrid-meter:
        #update lastupdate vars
        self._lastUpdate = time.time()              
     except Exception as e:
+       self._errorState()
        logging.critical('Error at %s', '_update', exc_info=e)
        
     # return true, otherwise add_timeout will be removed from GObject - see docs http://library.isr.ist.utl.pt/docs/pygtk2reference/gobject-functions.html#function-gobject--timeout-add