Serial Modem Host Applications

Host-side firmware for Nordic Smart Modem modules. This repository is built on nRF Connect SDK (NCS) and follows the modular zbus + SMF architecture used by the Asset Tracker Template.

Supported product targets:

• 91m1_ppp: PPP host application for the nRF91M1 Smart Modem
• 93m1_ppp: PPP host application for the nRF93M1 Smart Modem
• 93m1_at: AT host application for the nRF93M1 Smart Modem

---

Repository structure

Path	Purpose
west.yml	West manifest, pins NCS to v3.4-branch
zephyr/module.yml	Registers this repo as a Zephyr module
lib/include/	Shared headers (app_common.h)
applications/91m1_ppp/	nRF91M1 host application
applications/93m1_ppp/	nRF93M1 PPP host application
applications/93m1_at/	nRF93M1 AT host application

Getting started

Install prerequisites

1. Install nRF Util by following the instructions in the nRF Util documentation.

2. Install the SDK manager command:

   nrfutil install sdk-manager

3. Install the nRF Connect SDK toolchain (v3.4.0, matching west.yml):

   nrfutil sdk-manager install v3.4.0

Initialize the workspace

Before initializing, start the toolchain environment:

nrfutil sdk-manager toolchain launch --ncs-version v3.4.0 --shell

To initialize the workspace folder (smha-workspace) where the firmware project and all nRF Connect SDK modules will be cloned, run:

west init -m https://github.com/nrfconnect/ncs-serial-modem-host-applications --mr main smha-workspace
cd smha-workspace/project
west update

The repository is now cloned into the smha-workspace/project folder, the west modules are downloaded, and you are ready to build an application.

Build and flash

Follow the application documentation for hardware setup, build, flash, and (where applicable) cloud provisioning:

Application	Documentation	Cloud connectivity
91m1_ppp	applications/91m1_ppp/doc/	Host terminates CoAP/DTLS to nRF Cloud itself. PPP just carries IP to the nRF91M1 modem
93m1_ppp	applications/93m1_ppp/doc/	Host terminates CoAP/DTLS to nRF Cloud itself. PPP just carries IP to the nRF93M1 modem
93m1_at	applications/93m1_at/doc/	Modem terminates the connection itself with its built-in AT client. Host just sends AT commands

---

Contributing

See CI and contribution for continuous integration, releases, and commit message guidelines.

License

See LICENSE.