prevent eql_readings to be saved to db.

app/helpers/InSyncState.rb

@@ -77,8 +77,13 @@ class InSyncState < StatePattern::State
              next_is_gas = true # the usage is on the next line
            end                
          }
-                                
-        reading.save
+        
+        last_reading = Reading.last
+        if last_reading.eql_reading?(reading)
+          p "Nothing changed. Do not add to the database"
+        else                        
+          reading.save
+        end
         return reading
 
      end