SQNSNVW +CME ERROR: operation not supported

LTE-M / NB-IoT (Monarch)
1

Hi I’m using the GM02SP with firmware UE8.2.2.1 attempting to add certificates to it using:

AT+SQNSNVW=“certificate”,5,788\r\n

-----BEGIN CERTIFICATE-----

CERTIFICATE DATA

-----END CERTIFICATE-----

but just get +CME ERROR: operation not supported as a response once i finish sending the certificate, i can read certificate 1-3

and get the following when i send AT+SQNSNVW=?\r\n
OK

+SQNSNVW: “certificate”,(5,6,11-19),(0-8192)

+SQNSNVW: “privatekey”,(0-19),(0-2048)

+SQNSNVW: “strid”,(0-19),(0-1024)

OK

the certificate is valid i even tried adding one extra byte to the size and using one less byte for the size to see if i was off by one on the parameter, but got the same operation not supported

AT+SQNSNVW=“certificate”,5,787\r\n

AT+SQNSNVW=“certificate”,5,789\r\n

so I’m not sure why it would be having this issue, is there a certificate someone has that is known to work so i can try uploading it? or is there something else I’m missing?

2

Hi Brandon,

The issue seems to be linked to the exact certificate size, like including any \n or \r\n characters added during copy-and-paste into the serial terminal tool.
Is that possible you can review the certificate content with text editor like Notepad++.
(In Notepad++, it is possible to see all symbols with the menu View → Show Symbol → Show All Characters)
The newline character (\n) should not be transmitted. Since the file was converted from plain text into a C character array, line endings were converted into line feed (LF) and carriage return (CR) characters. The 0x0A character (line feed) should not be included in the transmitted data.

3

Hi cmchen,

yeah unfortunately i already stripped and new line and carriage returns are the bytes only suppose to include the bytes between “-----BEGIN CERTIFICATE-----” and “-----END CERTIFICATE-----”? i am currently including those in the total length. or is it possible it only accepts certain certificate types?

4

Hi Brandon,

AT+SQNSNVW do not filter the specific certificate types. In this case, is that possible you can share the certificate file then I can run it with my setup.

5

sure, here it is I’m using the following command and cert

AT+ =“certificate”,5,788\r\n

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----

6

does anyone have a certificate that is known to work? so i can try it and see if there is some other reason this certificate might be failing to upload

7

Hi Brandon,

Sorry the the delayed reply.
I manage to reproduce the error by the certificate file which you shared before.
I am clarifying it and will back to you later.

8

Hi Brandon,

I manage to write certificate file into NVRAM of GM02SP and the notes are:
1\ Make sure line endings in your certificate/key file are Unix (LF), not Windows (CRLF), or the byte count won’t match what you specified.

2\File size: Here I got 802 bytes and following description is how I count it into 802:

  1. The base64 payload is 736 characters, wrapped at 64 chars/line = 12 lines.
  2. Total bytes = -----BEGIN CERTIFICATE-----\n + 12 base64 lines each ending in \n + -----END CERTIFICATE-----\n = 802 bytes, counting each line ending as a single LF (\n), not CRLF.

Working command example:
AT+SQNSNVW=“certificate”,5,802

Then, after the > prompt appears, send exactly this data:
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----