Add some string reading bits, SerialNumber test failing

README.md

@@ -1,8 +1,11 @@
 # pyFroniusReg
 
-python library for interacting with Fronius inverters via modbus/TCP. Includes some example utilities
+The aim of this python library is to provide some nice to use abstractions to interact with Fronius solar inverters and storage systems over ModBus. It is tested on a Gen24 Primo 5kW system with an attached BYD battery storage system using 'float' mode of the sunspec ModBus over TCP protocol.
 
-FroniusReg.py: the library
+
+
+
+# Examples
 
 force_charge.py: Use the library to force my system to charge at 2.5kW
 

examples/read_regs.py

@@ -1,32 +1,44 @@
 #!/usr/bin/env python3
 
 from pyfroniusreg import gen24_registers as froniusreg
+from pyfroniusreg.froniusreg import registerReadError
 
 from pymodbus.client.tcp import ModbusTcpClient
 
 fronius1 = ModbusTcpClient("172.19.107.211", port=502, timeout=10)
 fronius1.connect()
 
+print(froniusreg.ID.getValue(fronius1))
+print(froniusreg.L.getValue(fronius1))
+# Some strings
+
+print(froniusreg.Mn.getValue(fronius1))
+print(froniusreg.Md.getValue(fronius1))
+print(froniusreg.Vr.getValue(fronius1))
+print(froniusreg.SN.getValue(fronius1))
+print(froniusreg.DA.getValue(fronius1))
+
+    
 soc = froniusreg.scaledStateOfCharge.getValue(fronius1)
 print(" SOC: %s%%" % soc)
 
 discharge = froniusreg.scaledOutWRte.getValue(fronius1)
-print("Pre DRate: %d%%" % discharge)
+print(" DRate: %d%%" % discharge)
 
 charge = froniusreg.scaledInWRte.getValue(fronius1)
-print("Pre CRate: %d%%" % charge)
+print(" CRate: %d%%" % charge)
 
 mode = froniusreg.StorCtl_Mode.getValue(fronius1)
-print("Pre Mode: %d" % mode)
+print(" Mode: %d" % mode)
 
 reserve = froniusreg.scaledReserve.getValue(fronius1)
-print("Pre Res: %d" % reserve)
+print(" Res: %d" % reserve)
 
 rate = froniusreg.scaledMaxChaRte.getValue(fronius1)
-print("Pre rate: %d" % rate)
+print(" rate: %d" % rate)
 
 rate = froniusreg.scaledMaxWChaGra.getValue(fronius1)
-print("Pre WGra rate: %d" % rate)
+print(" WGra rate: %d" % rate)
 
 revert = froniusreg.InOutWRte_RvrtTms.getValue(fronius1)
 print("Timer: %d" % revert)

src/pyfroniusreg/froniusreg.py

@@ -29,16 +29,25 @@ class DataType():
 
 
 # helper functions for DataType constructors
-def decode_string(decoder, value):
+def decode_string8(decoder):
-    return str(decoder.decode_string(16).decode('utf-8'))
+    return str(decoder.decode_string(8).decode('utf-8'))
+
+def decode_string16(decoder):
+    try:
+        return str(decoder.decode_string(16).decode('utf-8'))
+    except UnicodeDecodeError:
+        return str(decoder.decode_string(16))
+    
+def decode_string32(decoder):
+    return str(decoder.decode_string(32).decode('utf-8'))
 
 def encode_16bit_int(encoder, value):
     return encoder.add_16bit_int(int(value))
 
 # The various data types that the fronius inverters use
-string8 = DataType(4, decode_string, BinaryPayloadBuilder.add_string)
+string8 = DataType(4, decode_string8, BinaryPayloadBuilder.add_string)
-string16 = DataType(8, decode_string, BinaryPayloadBuilder.add_string)
+string16 = DataType(8, decode_string16, BinaryPayloadBuilder.add_string)
-string32 = DataType(16, decode_string, BinaryPayloadBuilder.add_string)
+string32 = DataType(16, decode_string32, BinaryPayloadBuilder.add_string)
 int16 = DataType(1, BinaryPayloadDecoder.decode_16bit_int, encode_16bit_int)
 uint16 = DataType(1, BinaryPayloadDecoder.decode_16bit_uint, encode_16bit_int)
 int32 = DataType(2, BinaryPayloadDecoder.decode_32bit_int, BinaryPayloadBuilder.add_32bit_int)
@@ -80,7 +89,7 @@ class FroniusReg:
                                                           self.datatype.width,
                                                           slave=self.unit)
         if(modbusValue.isError()):
-            raise registerReadError("Unable to read from Fronius Register: %d, %s" % (self.id, self.description))
+            raise registerReadError("Unable to read from Fronius Register: %d, %s\n%s" % (self.address, self.description, modbusValue))
         if(modbusValue is None):
             raise registerReadError("It's NONE!")
         return self.datatype.decode_from_register(modbusValue.registers)

src/pyfroniusreg/gen24_registers.py

@@ -8,6 +8,14 @@ storageStateOfCharge = froniusreg.FroniusReg(40362, froniusreg.uint16, 1, "Stora
 storageStateOfChargeSF = froniusreg.FroniusReg(40376, froniusreg.int16, 1, "Storage State of Charge Scaling Factor")
 scaledStateOfCharge = froniusreg.ScaledFroniusReg(storageStateOfCharge, storageStateOfChargeSF)
 
+ID = froniusreg.FroniusReg(40003, froniusreg.uint16, 1, "Well-known value. Uniquely identifies this as a sunspec model 'common' (1)")
+L = froniusreg.FroniusReg(40004, froniusreg.uint16, 1, "Sunspec model commen register count")
+Mn = froniusreg.FroniusReg(40005, froniusreg.string16, 1, "Manufacturer")
+Md = froniusreg.FroniusReg(40021, froniusreg.string16, 1, "Device Model")
+Vr = froniusreg.FroniusReg(40045, froniusreg.string8, 1, "SW version")
+SN = froniusreg.FroniusReg(40068, froniusreg.string16, 1, "Serial Number")
+DA = froniusreg.FroniusReg(40069, froniusreg.uint16, 1, "Modbus Device Address")
+
 OutWRte = froniusreg.FroniusReg(40366, froniusreg.int16, 1, "DischargeRate")
 InWRte = froniusreg.FroniusReg(40367,  froniusreg.int16, 1, "ChargeRate")
 WRteSF = froniusreg.FroniusReg(40379, froniusreg.int16, 1, "ScalingFactor for storage Watts")

tests/test_regs.py

@@ -18,6 +18,23 @@ class TestRead(unittest.TestCase):
         dr = gen24_registers.OutWRte.getValue(fronius1)
         assert isinstance(dr, int)
 
+    def test_read_string16(self):
+        Mn = gen24_registers.Mn.getValue(fronius1)
+        assert Mn[0:7] == "Fronius"
+
+    def test_read_string8(self):
+        # this isn't a good test, this value changes regularly
+        Vr = gen24_registers.Vr.getValue(fronius1)
+        assert Vr == "1.33.7-1"
+
+    def test_read_model(self):
+        Md = gen24_registers.Md.getValue(fronius1)
+        assert Md == "Primo GEN24 5.0\x00"
+
+    def test_read_sn(self):
+        SN = gen24_registers.SN.getValue(fronius1)
+        assert SN == "12345567"
+
     def test_write_direct(self):
         current = gen24_registers.OutWRte.getValue(fronius1)
         retval = gen24_registers.OutWRte.setValue(fronius1, current)