Catch wrong encryption key error (was: struct.error: unpack requires a buffer of 2 bytes)

[frefal]

Hi, Trying to get this running against a S10 Pro. Not sure if this is a problem with my system, or the module. Any tip would be greatly appreciated !

Python 3.7.3

Installed it via:

• git clone
• pip3 install .

Using the sample provided from the readme,:

`from e3dc import E3DC TCP_IP = 'x.x.x.x' USERNAME = 'xx' PASS = 'xx' KEY = 'xx' SERIALNUMBER = 'xx'

print("local connection") e3dc = E3DC(E3DC.CONNECT_LOCAL, username=USERNAME, password=PASS, ipAddress = TCP_IP, key = KEY) print(e3dc.poll()) print(e3dc.poll_switches())`

Executed: python3 test.py

Result: local connection Traceback (most recent call last): File "/usr/local/lib/python3.7/dist-packages/e3dc/_e3dc_rscp_local.py", line 51, in sendRequest receive = self._receive() File "/usr/local/lib/python3.7/dist-packages/e3dc/_e3dc_rscp_local.py", line 42, in _receive decData = rscpDecode( self.encdec.decrypt(data) )[0] File "/usr/local/lib/python3.7/dist-packages/e3dc/_rscpLib.py", line 149, in rscpDecode magic = struct.unpack(magicCheckFmt, data[:struct.calcsize(magicCheckFmt)])[0] struct.error: unpack requires a buffer of 2 bytes

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "/usr/local/lib/python3.7/dist-packages/e3dc/_e3dc.py", line 340, in sendRequest self.rscp.connect() File "/usr/local/lib/python3.7/dist-packages/e3dc/_e3dc_rscp_local.py", line 79, in connect ('RSCP_AUTHENTICATION_PASSWORD', 'CString', self.password)]) ) File "/usr/local/lib/python3.7/dist-packages/e3dc/_e3dc_rscp_local.py", line 54, in sendRequest raise CommunicationError e3dc._e3dc_rscp_local.CommunicationError

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File "test.py", line 18, in e3dc = E3DC(E3DC.CONNECT_LOCAL, username=USERNAME, password=PASS, ipAddress = TCP_IP, key = KEY) File "/usr/local/lib/python3.7/dist-packages/e3dc/_e3dc.py", line 106, in init self.get_system_info_static(keepAlive=True) File "/usr/local/lib/python3.7/dist-packages/e3dc/_e3dc.py", line 537, in get_system_info_static self.deratePercent = round(self.sendRequest( ('EMS_REQ_DERATE_AT_PERCENT_VALUE', 'None', None), keepAlive = True )[2] * 100) File "/usr/local/lib/python3.7/dist-packages/e3dc/_e3dc.py", line 348, in sendRequest raise SendError("Max retries reached") e3dc._e3dc.SendError: Max retries reached

[fsantini]

Mmm it seems that the system is returning some wrong data. I think that the only situation in which you could have this error is if the 'data' variable is smaller than 2 bytes. Maybe you can try troubleshooting by adding a print(len(data)) in rscpDecode before the statement that raised the error.

[frefal]

it prints out 0 any further idea would be greatly appreciated !

[fsantini]

Maybe could you check the encryption key if it's correct?

[frefal]

facepalm that is --- thanks!!

[fsantini]

Lol. Glad that we found the culprit. I should try to catch the error and return a meaningful error message.

[grothkopp]

Can someone help me where I find or set this encryption key? The only key I found is the cloud-registry key in "User Profile" but I get the same error as described here when I use that one.

[vchrisb]

In German: Hauptmenü > Personalisieren > Benutzerprofil > RSCP Passwort

[grothkopp]

Thank you! Maybe someone could add that to the README.md to clarify "The encryption key as set under the preferences of the system"?

[mdhom]

this info can be found in the readme (just checked) -> this issue can be closed I think?