Better way to make this working

Added 2 attempts to get data. Sometime the data is borken on decoding it,
so try to fetch again the data twice

plugin.py

@@ -7,7 +7,7 @@ Requirements:
     2. pymodbus AND pymodbusTCP
 """
 """
-<plugin key="DS238_ModbusTCP" name="DS238-2 ZN/S ModbusTCP" author="Xavier Beaudouin" version="0.0.2" externallink="https://github.com/xbeaudouin/domoticz-ds238-modbus-tcp">
+<plugin key="DS238_ModbusTCP" name="DS238-2 ZN/S ModbusTCP" author="Xavier Beaudouin" version="0.0.3" externallink="https://github.com/xbeaudouin/domoticz-ds238-modbus-tcp">
     <params>
         <param field="Address" label="IP Address" width="150px" required="true" />
         <param field="Port" label="Port Number" width="100px" required="true" default="502" />
@@ -211,7 +211,6 @@ class BasePlugin:
             Devices[9].Update(1, "0")
             Devices[10].Update(1, "0")
 
-        # TODO: catch errors
         # 3 counters
         total_e = "0"
         export_e = "0"
@@ -221,80 +220,30 @@ class BasePlugin:
         power = "0"
 
         # Total Energy
-        #data = client.read_holding_registers(0, 2)
-        #Domoticz.Debug("Data from register 0: "+str(data))
-        ## Unsigned 32 
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        ## Value
-        #value = decoder.decode_32bit_int()
-        #total_e = str(value)
         total_e = str(getmodbus32(0, client))
 
         # Export Energy
-        #data = client.read_holding_registers(0x8, 2)
-        #Domoticz.Debug("Data from register 0x8: "+str(data))
-        # Unsigned 32 
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        # Value
-        #value = decoder.decode_32bit_int()
-        #export_e = str(value)
         export_e = str(getmodbus32(0x8, client))
 
         # Import Energy
-        #data = client.read_holding_registers(0xA, 2)
-        #Domoticz.Debug("Data from register 0xA: "+str(data))
-        ## Unsigned 32 
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        ## Value
-        #value = decoder.decode_32bit_int()
-        #import_e = str(value)
         import_e = str(getmodbus32(0xA, client))
 
         # Voltage
-        #data = client.read_holding_registers(0xC, 1)
-        #Domoticz.Debug("Data from register 0xC: "+str(data))
-        # Unsigned 16
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        # Value
-        #value = decoder.decode_16bit_int()
-        # Scale factor / 10
         value = round (getmodbus16(0xC,client) / 10, 3)
-        Domoticz.Debug("Value after conversion : "+str(value))
-        Domoticz.Debug("-> Calculating average")
         self.voltage.update(value)
         value = self.voltage.get()
-        Domoticz.Debug(" = {}".format(value))
         Devices[4].Update(1, str(value))
 
         # Current
-        #data = client.read_holding_registers(0xD, 1)
-        #Domoticz.Debug("Data from register 0xD: "+str(data))
-        # Unsigned 16
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        # Value
-        #value = decoder.decode_16bit_int()
-        # Scale factor / 100
         value = round (getmodbus16(0xD,client) / 100, 3)
-        Domoticz.Debug("Value after conversion : "+str(value))
-        Domoticz.Debug("-> Calculating average")
         self.current.update(value)
         value = self.current.get()
-        Domoticz.Debug(" = {}".format(value))
         Devices[5].Update(1, str(value))
 
         # Active Power
-        #data = client.read_holding_registers(0xE, 1)
-        #Domoticz.Debug("Data from register 0xE: "+str(data))
-        # Unsigned 16
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        # Value
-        #value = decoder.decode_16bit_int()
-        #Domoticz.Debug("Value after conversion : "+str(value))
-        #Domoticz.Debug("-> Calculating average")
         value = getmodbus16(0xE, client)
         self.active_power.update(value)
         value = self.active_power.get()
-        Domoticz.Debug(" = {}".format(value))
         Devices[6].Update(1, str(value))
         if value > 0.0:
             import_w = value
@@ -303,53 +252,23 @@ class BasePlugin:
         power = str(abs(value))
 
         # Reactive Power
-        #data = client.read_holding_registers(0xF, 1)
-        #Domoticz.Debug("Data from register 0xF: "+str(data))
-        # Unsigned 16
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        ## Value
-        #value = decoder.decode_16bit_int()
-        #Domoticz.Debug("Value after conversion : "+str(value))
-        #Domoticz.Debug("-> Calculating average")
         value = getmodbus16(0xF, client)
         self.reactive_power.update(value)
         value = self.reactive_power.get()
-        Domoticz.Debug(" = {}".format(value))
         Devices[7].Update(1, str(value))
 
         # Power Factor
-        #data = client.read_holding_registers(0x10, 1)
-        #Domoticz.Debug("Data from register 0x10: "+str(data))
-        # Unsigned 16
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        # Value
-        #value = decoder.decode_16bit_int()
-        # Scale factor / 1000
         value = round (getmodbus16(0x10,client) / 1000, 3)
-        Domoticz.Debug("Value after conversion : "+str(value))
-        Domoticz.Debug("-> Calculating average")
         self.power_factor.update(value)
         value = self.power_factor.get()
-        Domoticz.Debug(" = {}".format(value))
         Devices[8].Update(1, str(value))
 
         # Frequency
-        #data = client.read_holding_registers(0x11, 1)
-        #Domoticz.Debug("Data from register 0x11: "+str(data))
-        # Unsigned 16
-        #decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
-        ## Value
-        #value = decoder.decode_16bit_int()
-        # Scale factor / 100
         value = round (getmodbus16(0x11, client) / 100, 3)
-        Domoticz.Debug("Value after conversion : "+str(value))
-        Domoticz.Debug("-> Calculating average")
         self.frequency.update(value)
         value = self.frequency.get()
-        Domoticz.Debug(" = {}".format(value))
         Devices[9].Update(1, str(value))
 
-
         # Do insert data on counters 
         Devices[1].Update(1, sValue=total_e+"0;0;0;0;"+power+";0")
         Devices[2].Update(1, sValue=export_e+"0;0;0;0;"+str(abs(export_w))+";0")
@@ -409,28 +328,41 @@ def DumpConfigToLog():
 
 # get Modbus 32 bits values
 def getmodbus32(register, client):
+    value = 0
     try:
         data = client.read_holding_registers(register, 2)
         Domoticz.Debug("Data from register "+str(register)+": "+str(data))
         decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
         value = decoder.decode_32bit_int()
-        return value
     except:
-        Domoticz.Error("Error getting data from "+str(register))
+        Domoticz.Error("Error getting data from "+str(register) + ", try 1")
-        return 0
+        try:
+            data = client.read_holding_registers(register, 2)
+            Domoticz.Debug("Data from register "+str(register)+": "+str(data))
+            decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
+            value = decoder.decode_32bit_int()
+        except:
+            Domoticz.Error("Error getting data from "+str(register) + ", try 2")
+
+    return value
 
 # get Modbug 16 bits values
 def getmodbus16(register, client):
+    value = 0
     try:
         data = client.read_holding_registers(register, 1)
         Domoticz.Debug("Data from register "+str(register)+": "+str(data))
         decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
         value = decoder.decode_16bit_int()
-        return value
     except:
-        Domoticz.Error("Error getting data from "+str(register))
+        Domoticz.Error("Error getting data from "+str(register) + ", try 1")
-        return 0
+        try:
-
+            data = client.read_holding_registers(register, 1)
-
+            Domoticz.Debug("Data from register "+str(register)+": "+str(data))
+            decoder = BinaryPayloadDecoder.fromRegisters(data, byteorder=Endian.Big, wordorder=Endian.Big)
+            value = decoder.decode_16bit_int()
+        except:
+            Domoticz.Error("Error getting data from "+str(register) + ", try 2")
 
+    return value