Sensors unavailable after update and back

[marcbaul]

After an update to 0.8.3 and reverse to 0.8.2 the sensors in Zaptec are unavailable. In the log the following error appear:

`Logger: homeassistant.components.sensor
Source: helpers/entity_platform.py:451
integration: Sensor (documentation, issues)
First occurred: 8:03:09 AM (1 occurrence)
Last logged: 8:03:09 AM

Error while setting up zaptec platform for sensor: 'str' object has no attribute 'get'
Traceback (most recent call last):
File "/usr/src/homeassistant/homeassistant/helpers/entity_platform.py", line 451, in _async_setup_platform
await asyncio.shield(awaitable)
File "/config/custom_components/zaptec/sensor.py", line 354, in async_setup_entry
entities = entry.runtime_data.create_entities_from_zaptec(
INSTALLATION_ENTITIES,
CHARGER_ENTITIES,
)
File "/config/custom_components/zaptec/init.py", line 478, in create_entities_from_zaptec
self.create_entities_from_descriptions(
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^
charger_descriptions,
^^^^^^^^^^^^^^^^^^^^^
obj,
^^^^
info,
^^^^^
)
^
File "/config/custom_components/zaptec/init.py", line 422, in create_entities_from_descriptions
updater()
~~~~~~~^^
File "/config/custom_components/zaptec/sensor.py", line 121, in _update_from_zaptec
session_reading = get_ocmf_max_reader_value(session.get("SignedSession", {}))
^^^^^^^^^^^
AttributeError: 'str' object has no attribute 'get'`

and after

`This error originated from a custom integration.

Logger: custom_components.zaptec.api
Source: custom_components/zaptec/api.py:168
integration: Zaptec EV charger (documentation, issues)
First occurred: 8:03:09 AM (2 occurrences)
Last logged: 8:03:10 AM

Failed to convert attribute CompletedSession (completed_session) value '{"SessionId":"6fa67dab-f2d4-41bd-87ca-454697412c11","Energy":0.0,"StartDateTime":"2025-10-10T11:36:24.835091Z","EndDateTime":"2025-10-10T11:40:24.399049Z","ReliableClock":true,"StoppedByRFID":false,"AuthenticationCode":"nfc-xxxxxxxx","SignedSession":null}': 'NoneType' object has no attribute 'split'`

What can I do to get the Zaptec sensors working again?

[steinmn]

Your SignedSession value seems to be empty for some reason, it should contain lots of data on the OCMF-format.

1. What type of charger do you have, and what is the firmware version on it?
2. Which version of HA Core are you using?
3. Which zaptec version did you upgrade from?
4. Was the issue present on 0.8.3 as well, or did it first occur when you downgraded to 0.8.2?

Would you mind checking the response you get directly from the API?

• Go to https://api.zaptec.com/help/index.html#/Charger/api_chargers_%7Bid%7D_state_get
• Click the lock in the top right corner and log in with your regular zaptec portal user
• Click "Try it out", enter your charger id and click "Execute"
• Search for "723" (the StateId corresponding to CompletedSession), and see if there is a value for SignedSession there

[marcbaul]

Your SignedSession value seems to be empty for some reason, it should contain lots of data on the OCMF-format.

1. What type of charger do you have, and what is the firmware version on it?
   >> are multiple "Zaptec Pro MID" chargers, Firmware is 5.0.7.2

2. Which version of HA Core are you using?
   >> 2025.8.2

3. Which zaptec version did you upgrade from?
   >> from 0.8.2 to 0.8.3

4. Was the issue present on 0.8.3 as well, or did it first occur when you downgraded to 0.8.2?
   >> yes, coz this i downgraded to 0.8.2, but the issue persist (before the upgrade and downgrade it run without problems)

Would you mind checking the response you get directly from the API?

I did it for one station and i get (replaced some values with xxxxx). Is it necessary to do this for every station?

"{\"SessionId\":\"xxxxxxxxxxxxxxxx\",\"Energy\":21.664,\"StartDateTime\":\"2025-10-14T10:22:52.641354Z\",\"EndDateTime\":\"2025-10-14T15:32:27.267537Z\",\"ReliableClock\":true,\"StoppedByRFID\":false,\"AuthenticationCode\":\"nfc-BA8F62CF\",\"SignedSession\":\"OCMF|{\\\"FV\\\":\\\"1.0\\\",\\\"GI\\\":\\\"Zaptec Pro MID\\\",\\\"GS\\\":\\\"ZPR281820\\\",\\\"GV\\\":\\\"5.0.7.2\\\",\\\"PG\\\":\\\"T1\\\",\\\"MF\\\":\\\"v1.3.6\\\",\\\"IS\\\":true,\\\"IL\\\":\\\"HEARSAY\\\",\\\"IF\\\":[\\\"RFID_RELATED\\\"],\\\"IT\\\":\\\"ISO14443\\\",\\\"ID\\\":\\\"BA8F62CF\\\",\\\"RD\\\":[{\\\"TM\\\":\\\"2025-10-14T10:22:52,620+00:00 R\\\",\\\"TX\\\":\\\"B\\\",\\\"RV\\\":2269.513,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"RU\\\":\\\"kWh\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T10:30:00,331+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2270.636,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T10:45:00,272+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2271.942,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T11:00:00,513+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2272.775,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T11:15:00,987+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2275.033,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T11:30:01,262+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2277.634,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T11:45:00,257+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2280.237,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T12:00:00,443+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2282.844,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T12:15:01,214+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2285.452,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T12:30:00,886+00:00 S\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2287.489,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T12:45:01,094+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2287.774,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T13:00:01,033+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2288.078,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T13:15:00,897+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2288.382,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T13:30:00,653+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2288.685,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T13:45:01,133+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2288.992,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T14:00:00,629+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2289.298,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T14:15:00,360+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2289.607,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T14:30:00,803+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2289.912,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T14:45:00,450+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2290.216,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T15:00:00,252+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2290.52,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T15:15:00,751+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2290.825,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T15:30:01,056+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":2291.128,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T15:32:27,255+00:00 R\\\",\\\"TX\\\":\\\"E\\\",\\\"RV\\\":2291.177,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"}],\\\"ZS\\\":\\\"xxxxxxxxxxx\\\"}|{\\\"SA\\\":\\\"ECDSA-secp384r1-SHA256\\\",\\\"SE\\\":\\\"base64\\\",\\\"SD\\\":\\\"xxxxxxxxx"}\"}"

[steinmn]

Thanks for testing, as long as it's from a station that was failing in the home assistant integration, one should be enough. I'll see if I can reproduce the issue using your response.

If you want a quickhack to get your sensors back up and running, I think you can use the file editor addon to edit the offending line in /homeassistant/custom_components/zaptec/sensor.py like this (make sure to backup HA and verify you have your encryption key available first):

-        session_reading = get_ocmf_max_reader_value(session.get("SignedSession", {}))
+        session_reading = 0.0 # get_ocmf_max_reader_value(session.get("SignedSession", {}))

[steinmn]

Is the response above from the same charger that had the issue?

I'm unfortunately not able to reproduce the "SignedSession":null behaviour. When using your response, I do get a json error because there are some missing backslashes towards the end (end should be \\\"SD\\\":\\\"xxxxxxxxx\\\"}\"}"), but that error is completely different, so I think you just accidentally removed the extra backslashes when you replaced the value with xxxxxx.

[marcbaul]

Thanks for testing, as long as it's from a station that was failing in the home assistant integration, one should be enough. I'll see if I can reproduce the issue using your response.

If you want a quickhack to get your sensors back up and running, I think you can use the file editor addon to edit the offending line in /homeassistant/custom_components/zaptec/sensor.py like this (make sure to backup HA and verify you have your encryption key available first):

•    session_reading = get_ocmf_max_reader_value(session.get("SignedSession", {}))
  

•    session_reading = 0.0 # get_ocmf_max_reader_value(session.get("SignedSession", {}))
  

That helped; now the sensors are being read again.

[marcbaul]

Is the response above from the same charger that had the issue?

I'm unfortunately not able to reproduce the "SignedSession":null behaviour. When using your response, I do get a json error because there are some missing backslashes towards the end (end should be \\\"SD\\\":\\\"xxxxxxxxx\\\"}\"}"), but that error is completely different, so I think you just accidentally removed the extra backslashes when you replaced the value with xxxxxx.

I queried another station and hope that I didn't delete any backslashes this time:

"{\"SessionId\":\"xxxxxxxxxxxxxxxx\",\"Energy\":4.822,\"StartDateTime\":\"2025-10-14T14:15:47.301455Z\",\"EndDateTime\":\"2025-10-14T15:11:42.339543Z\",\"ReliableClock\":true,\"StoppedByRFID\":false,\"AuthenticationCode\":\"nfc-DA9F5FCF\",\"SignedSession\":\"OCMF|{\\\"FV\\\":\\\"1.0\\\",\\\"GI\\\":\\\"Zaptec Pro MID\\\",\\\"GS\\\":\\\"ZPR281867\\\",\\\"GV\\\":\\\"5.0.7.2\\\",\\\"PG\\\":\\\"T1\\\",\\\"MF\\\":\\\"v1.3.6\\\",\\\"IS\\\":true,\\\"IL\\\":\\\"HEARSAY\\\",\\\"IF\\\":[\\\"RFID_RELATED\\\"],\\\"IT\\\":\\\"ISO14443\\\",\\\"ID\\\":\\\"DA9F5FCF\\\",\\\"RD\\\":[{\\\"TM\\\":\\\"2025-10-14T14:15:47,278+00:00 R\\\",\\\"TX\\\":\\\"B\\\",\\\"RV\\\":1718.892,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"RU\\\":\\\"kWh\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T14:30:00,723+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":1721.293,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T14:45:00,826+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":1723.344,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T15:00:00,802+00:00 R\\\",\\\"TX\\\":\\\"T\\\",\\\"RV\\\":1723.714,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"},{\\\"TM\\\":\\\"2025-10-14T15:11:42,327+00:00 R\\\",\\\"TX\\\":\\\"E\\\",\\\"RV\\\":1723.714,\\\"RI\\\":\\\"1-0:1.8.0\\\",\\\"ST\\\":\\\"G\\\"}],\\\"ZS\\\":\\\"xxxxxxxxxxxxxxxx\\\"}|{\\\"SA\\\":\\\"ECDSA-secp384r1-SHA256\\\",\\\"SE\\\":\\\"base64\\\",\\\"SD\\\":\\\"xxxxxxxxxxxxxxxx\\\"}\"}"