applications: serial_lte_modem: Add PPP PDN selection

[trantanen]

Add support for selecting PDN used with PPP connection into #XPPP command. E.g., AT#XPPP=1,1 for enabling PPP for PDP context with CID 1.

Jira: LRCS-149

TODO:

• Testing
• #XPPP documentation update
• Release notes

[NordicBuilder]

CI Information

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Build number: 12

Inputs:

Sources:

sdk-nrf: PR head: 78bb5e620d1bcac95e747d156a1f78a5bd0cae4d

more details

sdk-nrf:

PR head: 78bb5e620d1bcac95e747d156a1f78a5bd0cae4d
merge base: 103b8e54d9952e959aee8e3ffe061d5540ac3efb
target head (main): 623d9fae9e59b90d76b29ba13dc6f13aa76574c3
Diff

Github labels

Enabled	Name	Description
	ci-disabled	Disable the ci execution
	ci-all-test	Run all of ci, no test spec filtering will be done
	ci-force-downstream	Force execution of downstream even if twister fails
	ci-run-twister	Force run twister
	ci-run-zephyr-twister	Force run zephyr twister

List of changed files detected by CI (3)

applications
│  ├── serial_lte_modem
│  │  ├── doc
│  │  │  │ PPP_AT_commands.rst
│  │  ├── src
│  │  │  │ slm_ppp.c
doc
│  ├── nrf
│  │  ├── releases_and_maturity
│  │  │  ├── releases
│  │  │  │  │ release-notes-changelog.rst

Outputs:

Toolchain

Version: 1d2c5d0ab5
Build docker image: docker-dtr.nordicsemi.no/sw-production/ncs-build:1d2c5d0ab5_8bf7ca4353

Test Spec & Results: ✅ Success; ❌ Failure; 🟠 Queued; 🟡 Progress; ◻️ Skipped; ⚠️ Quarantine

• ◻️ Toolchain - Skipped: existing toolchain is used
• ✅ Build twister
  • sdk-nrf test count: 7
• ✅ Integration tests
  • ✅ test-fw-nrfconnect-nrf-iot_serial_lte_modem

Disabled integration tests

• • desktop52_verification
  • doc-internal
  • test_ble_nrf_config
  • test-fw-nrfconnect-apps
  • test-fw-nrfconnect-ble_mesh
  • test-fw-nrfconnect-ble_samples
  • test-fw-nrfconnect-boot
  • test-fw-nrfconnect-chip
  • test-fw-nrfconnect-fem
  • test-fw-nrfconnect-nfc
  • test-fw-nrfconnect-nrf-iot_cloud
  • test-fw-nrfconnect-nrf-iot_libmodem-nrf
  • test-fw-nrfconnect-nrf-iot_mosh
  • test-fw-nrfconnect-nrf-iot_positioning
  • test-fw-nrfconnect-nrf-iot_samples
  • test-fw-nrfconnect-nrf-iot_thingy91
  • test-fw-nrfconnect-nrf-iot_zephyr_lwm2m
  • test-fw-nrfconnect-nrf_crypto
  • test-fw-nrfconnect-proprietary_esb
  • test-fw-nrfconnect-ps
  • test-fw-nrfconnect-rpc
  • test-fw-nrfconnect-rs
  • test-fw-nrfconnect-tfm
  • test-fw-nrfconnect-thread
  • test-low-level
  • test-sdk-audio
  • test-sdk-dfu
  • test-sdk-find-my
  • test-sdk-mcuboot
  • test-sdk-pmic-samples
  • test-sdk-wifi
  • test-secdom-samples-public

Note: This message is automatically posted and updated by the CI

[github-actions]

You can find the documentation preview for this PR here.

Preview links for modified nRF Connect SDK documents:

https://ncsdoc.z6.web.core.windows.net/PR-22014/nrf/releases_and_maturity/releases/release-notes-changelog.html
https://ncsdoc.z6.web.core.windows.net/PR-22014/nrf/applications/serial_lte_modem/doc/PPP_AT_commands.html