issue-51-telegram work in progress

dsmr_parser/objects.py

@@ -93,6 +93,12 @@ class Telegram(object):
         output = ""
         for attr, value in self:
             output += "{}: \t {}\n".format(attr, str(value))
+
+        for channel_id, mbus_device in self._mbus_channel_devices.items():
+            output += f'MBUS DEVICE (channel: {channel_id})\n'
+            for obis_name, value in mbus_device:
+                output += f'\t{obis_name}: \t {value} \n'
+
         return output
 
     def to_json(self):
@@ -348,7 +354,7 @@ class MbusDevice:
             yield attr, value
 
     def __str__(self):
-        output = ""
+        output = "CHANNEL_ID: \t {}\n".format(self.channel_id)
         for attr, value in self:
             output += "{}: \t {}\n".format(attr, str(value))
         return output

test/objects/test_mbusdevice.py

@@ -48,3 +48,14 @@ class MbusDeviceTest(unittest.TestCase):
                 'EQUIPMENT_IDENTIFIER_GAS': {'value': '4730303339303031393336393930363139', 'unit': None},
                 'HOURLY_GAS_METER_READING': {'datetime': '2020-04-26T22:30:01+02:00', 'value': 246.138, 'unit': 'm3'}}
         )
+
+    def test_str(self):
+        self.assertEqual(
+            str(self.mbus_device),
+            (
+                'CHANNEL_ID: 	 1\n'
+                'DEVICE_TYPE: 	 3	[None]\n'
+                'EQUIPMENT_IDENTIFIER_GAS: 	 4730303339303031393336393930363139	[None]\n'
+                'HOURLY_GAS_METER_READING: 	 246.138	[m3] at 2020-04-26T22:30:01+02:00\n'
+            )
+        )