add comms module from nrfcloud-utils (#21)

Integrate comms and command_interface modules from nrfcloud-utils. After
this, they will be removed from nrfcloud-utils and nrfcredstore is used
as a dependency. New test suites are provided to make imported modules
more robust. Some changes were made to the modules to integrate them.

This adds the following features:
* AT Shell support
* RTT Shell support
* Automatic Nordic Device detection
* Interactive device selection
* Reading IMEI
* Reading Attestation Token

---------

Signed-off-by: Maximilian Deubel <[email protected]>

Author: maxd-nordic

.editorconfig

@@ -0,0 +1,92 @@
+# EditorConfig: https://editorconfig.org/
+
+# top-most EditorConfig file
+root = true
+
+# All (Defaults)
+[*]
+charset = utf-8
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+max_line_length = 100
+
+# Assembly
+[*.S]
+indent_style = tab
+indent_size = 8
+
+# C
+[*.{c,h}]
+indent_style = tab
+indent_size = 8
+
+# C++
+[*.{cpp,hpp}]
+indent_style = tab
+indent_size = 8
+
+# Linker Script
+[*.ld]
+indent_style = tab
+indent_size = 8
+
+# Python
+[*.py]
+indent_style = space
+indent_size = 4
+
+# Perl
+[*.pl]
+indent_style = tab
+indent_size = 8
+
+# reStructuredText
+[*.rst]
+indent_style = space
+indent_size = 3
+
+# YAML
+[*.{yml,yaml}]
+indent_style = space
+indent_size = 2
+
+# Shell Script
+[*.sh]
+indent_style = space
+indent_size = 4
+
+# Windows Command Script
+[*.cmd]
+end_of_line = crlf
+indent_style = tab
+indent_size = 8
+
+# Valgrind Suppression File
+[*.supp]
+indent_style = space
+indent_size = 3
+
+# CMake
+[{CMakeLists.txt,*.cmake}]
+indent_style = space
+indent_size = 2
+
+# Makefile
+[Makefile]
+indent_style = tab
+indent_size = 8
+
+# Device tree
+[*.{dts,dtsi,overlay}]
+indent_style = tab
+indent_size = 8
+
+# Git commit messages
+[COMMIT_EDITMSG]
+max_line_length = 75
+
+# Kconfig
+[Kconfig*]
+indent_style = tab
+indent_size = 8

.github/workflows/python.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+        python-version: ['3.10', '3.11', '3.12', '3.13']
 
     steps:
       - uses: actions/checkout@v4

README.md

@@ -15,24 +15,32 @@ For the device to respond to AT commands, the firmware on the device must have a
 ## Command Line Interface
 
 ```
-usage: nrfcredstore [-h] [--baudrate BAUDRATE] [--timeout TIMEOUT] dev {list,write,delete,generate} ...
+usage: nrfcredstore [-h] [--baudrate BAUDRATE] [--timeout TIMEOUT] [--debug] [--cmd-type {at,shell,auto}]
+                    dev {list,write,delete,deleteall,imei,attoken,generate} ...
 
 Manage certificates stored in a cellular modem.
 
 positional arguments:
-  dev                   Serial device used to communicate with the modem.
+  dev                   Device used to communicate with the modem. For interactive selection of serial port, use "auto". For RTT, use "rtt". If given a SEGGER
+                        serial number, it is assumed to be an RTT device.
 
 options:
   -h, --help            show this help message and exit
   --baudrate BAUDRATE   Serial baudrate
   --timeout TIMEOUT     Serial communication timeout in seconds
+  --debug               Enable debug logging
+  --cmd-type {at,shell,auto}
+                        Command type to use. "at" for AT commands, "shell" for shell commands, "auto" to detect automatically.
 
 subcommands:
-  {list,write,delete,generate}
+  {list,write,delete,deleteall,imei,attoken,generate}
                         Certificate related commands
     list                List all keys stored in the modem
     write               Write key/cert to a secure tag
     delete              Delete value from a secure tag
+    deleteall           Delete all keys in a secure tag
+    imei                Get IMEI from the modem
+    attoken             Get attestation token of the modem
     generate            Generate private key
 ```
 
@@ -56,7 +64,7 @@ Secure tag   Key type           SHA
 
 ### write subcommand
 
-Write key/cert to a secure tag. KEY_TYPE must be either ROOT_CA_CERT, CLIENT_CERT, CLIENT_KEY, or PSK.
+Write key/cert to a security tag. KEY_TYPE must be either ROOT_CA_CERT, CLIENT_CERT, CLIENT_KEY, or PSK.
 
 ```
 usage: nrfcredstore [--baudrate BAUDRATE] [--timeout TIMEOUT] dev write SECURE_TAG KEY_TYPE FILENAME
@@ -68,7 +76,7 @@ usage: nrfcredstore [--baudrate BAUDRATE] [--timeout TIMEOUT] dev write SECURE_T
 
 ### delete subcommand
 
-Delete value from a secure tag.
+Delete value from a security tag.
 
 ```
 usage: nrfcredstore [--baudrate BAUDRATE] [--timeout TIMEOUT] dev delete SECURE_TAG KEY_TYPE
@@ -78,6 +86,31 @@ usage: nrfcredstore [--baudrate BAUDRATE] [--timeout TIMEOUT] dev delete SECURE_
 
     $ nrfcredstore /dev/tty.usbmodem0009600000001 delete 123 ROOT_CA_CERT
 
+### deletall subcommand
+
+Delete all writable security tags.
+
+```
+usage: nrfcredstore [--baudrate BAUDRATE] [--timeout TIMEOUT] dev deleteall
+```
+
+### imei subcommand
+
+Read IMEI from modem.
+
+```
+usage: nrfcredstore [--baudrate BAUDRATE] [--timeout TIMEOUT] dev imei
+```
+
+### attoken subcommand
+
+Read Attestation Token from modem.
+
+```
+usage: nrfcredstore [--baudrate BAUDRATE] [--timeout TIMEOUT] dev attoken
+```
+
+
 ### generate subcommand
 
 > [!IMPORTANT]
@@ -114,4 +147,4 @@ Running the tests depends on a [development installation](#development-installat
 
 Check coverage
 
-    poetry run pytest --cov=. tests
+    poetry run pytest --cov=src tests --cov-report=html