ppp to the internet trough the nrf9151-dk

[eazuag]

hello to all.

i been strugling the last couple of days to make a simple PPP connection from a debian12 laptop to the internet passing trough the nrf9151. I followed the documentation for SLM and modem_shell:

https://docs.nordicsemi.com/bundle/ncs-2.9.1/page/nrf/applications/serial_lte_modem/README.html

https://docs.nordicsemi.com/bundle/ncs-2.9.1/page/nrf/samples/cellular/modem_shell/README.html#modem-shell-application

my projet consists in attaching a raspberry PI to the the nrf9151-dk kit, and make a PPP connection to the internet. Then, ill do everything else (routing, nat, etc) from the raspberry. The only thing i really need is to program the modem in such a way that allows the PPP incoming petition and allow the debian12 to rise a ppp interface that allow me to work with.  I took the sample files of modem_shell and SLM from SDK 2.9.1 and tried to recompile with diferents options. Nothing works.

Linux detects it only as J-link

root@DietPi:~# lsusb
Bus 001 Device 006: ID 1366:1059 SEGGER J-Link
Bus 001 Device 004: ID 0424:7800 Microchip Technology, Inc. (formerly SMSC)
Bus 001 Device 003: ID 0424:2514 Microchip Technology, Inc. (formerly SMSC) USB 2.0 Hub
Bus 001 Device 002: ID 0424:2514 Microchip Technology, Inc. (formerly SMSC) USB 2.0 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

/dev/ttyACM0

/dev/ttyACM1

/dev/ttyAMA0

usbmodeswitch doesnt seem to find it as a standar modem, so the compiling must be the problem (i guess). Im a total newbie in Nordic.

Is there a sample already build for this?

[Hakon]

Hello,

i been strugling the last couple of days to make a simple PPP connection from a debian12 laptop to the internet passing trough the nrf9151.

can you describe in detail what you do when building this? I got this to run on a run using a Linux computer and nrf9151 dk. I built with the ppp.overlay and ppp-overlay.conf.

[eazuag]

Hi Hakon. I assume you are talking about SML. Here's my building config:

overlay-ppp.conf  : 

#

# Copyright (c) 2023 Nordic Semiconductor ASA

#

# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

#

CONFIG_SLM_PPP=y

# When using PPP, disable commands of IP-based protocols to save flash space.

CONFIG_SLM_FTPC=n

CONFIG_SLM_TFTPC=n

CONFIG_SLM_HTTPC=n

CONFIG_SLM_MQTTC=n

# NCS modem libraries

CONFIG_PDN=y

CONFIG_AT_CMD_CUSTOM=y

CONFIG_NRF_MODEM_LIB_SHMEM_TX_SIZE=22528

# Zephyr PPP support

CONFIG_NET_NATIVE=y

CONFIG_NET_L2_PPP=y

CONFIG_MODEM_MODULES=y

CONFIG_MODEM_PPP=y

CONFIG_MODEM_BACKEND_UART=y

CONFIG_MODEM_BACKEND_UART_ASYNC_TRANSMIT_TIMEOUT_MS=1000

# L2 protocol

CONFIG_NET_L2_PPP_MGMT=y

CONFIG_NET_L2_PPP_OPTION_MRU=y

CONFIG_NET_L2_PPP_OPTION_SERVE_IP=y

CONFIG_NET_L2_PPP_OPTION_SERVE_DNS=y

CONFIG_NET_L2_PPP_TIMEOUT=5000

CONFIG_NET_L2_PPP_MAX_CONFIGURE_REQ_RETRANSMITS=20

# IP stack

CONFIG_NET_IP_ADDR_CHECK=n

CONFIG_NET_SOCKETS_PACKET=y

# network buffering

CONFIG_NET_BUF=y

CONFIG_NET_BUF_POOL_USAGE=y

CONFIG_NET_PKT_RX_COUNT=44

CONFIG_NET_BUF_RX_COUNT=88

CONFIG_NET_PKT_TX_COUNT=44

CONFIG_NET_BUF_TX_COUNT=88

CONFIG_NET_TC_RX_COUNT=0

# debug options

#CONFIG_LOG_PROCESS_THREAD_STACK_SIZE=4096

#CONFIG_NET_LOG=y

#CONFIG_NET_IF_LOG_LEVEL_DBG=y

#CONFIG_NET_PKT_LOG_LEVEL_DBG=y

#CONFIG_NET_L2_PPP_LOG_LEVEL_DBG=y

#CONFIG_NET_MGMT_EVENT_LOG_LEVEL_DBG=y

#CONFIG_MODEM_MODULES_LOG_LEVEL_DBG=y

#CONFIG_UART_LOG_LEVEL_DBG=y

 

overlay-ppp-without-cmux.conf     : 

#

# Copyright (c) 2024 Nordic Semiconductor ASA

#

# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

#

# Include this Kconfig fragment only if using PPP without CMUX.

# Ensure that HW RX byte counting is enabled for the PPP UART. This especially matters at higher baud rates.

CONFIG_UART_1_NRF_HW_ASYNC=y

CONFIG_UART_1_NRF_HW_ASYNC_TIMER=1

overlay-ppp-without-cmux.overlay    :

/*

 * Copyright (c) 2023 Nordic Semiconductor ASA

 *

 * SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

 */

/* Include this devicetree overlay only if using PPP without CMUX. */

 / {

    chosen {

        ncs,slm-ppp-uart = &uart1;

    };

};

/* PPP UART. Baud rates other than 115200/230400/1000000 didn't work on uart1. */

&uart1 {

    status = "okay";

    hw-flow-control;

    current-speed = <1000000>;

};

[eazuag]

and this is my prj.conf:

#

# Copyright (c) 2020 Nordic Semiconductor ASA

#

# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause

#

# General config

CONFIG_LOG=y

CONFIG_LOG_DEFAULT_LEVEL=3

CONFIG_STACK_SENTINEL=y

CONFIG_PICOLIBC_IO_FLOAT=y

CONFIG_RING_BUFFER=y

CONFIG_REBOOT=y

CONFIG_EVENTFD=y

# Segger RTT

CONFIG_USE_SEGGER_RTT=y

# Where console messages (printk) are output.

# By itself, SLM does not output any.

CONFIG_RTT_CONSOLE=y

CONFIG_UART_CONSOLE=n

# Where SLM logs are output.

CONFIG_LOG_BACKEND_RTT=y

CONFIG_LOG_BACKEND_UART=n

# Network

CONFIG_NETWORKING=y

CONFIG_NET_SOCKETS=y

CONFIG_NET_NATIVE=n

CONFIG_NET_IPV4=y

CONFIG_NET_IPV6=y

# Modem library

CONFIG_NRF_MODEM_LIB=y

CONFIG_AT_CMD_CUSTOM=y

# Align the max FD entry to NRF_MODEM_MAX_SOCKET_COUNT(8)

CONFIG_ZVFS_OPEN_MAX=8

# Handle modem fault

CONFIG_NRF_MODEM_LIB_ON_FAULT_APPLICATION_SPECIFIC=y

# Use GPIO

CONFIG_GPIO=y

CONFIG_GPIO_NRFX=y

# UART interface

CONFIG_SERIAL=y

CONFIG_UART_USE_RUNTIME_CONFIGURE=y

CONFIG_UART_ASYNC_API=y

CONFIG_NRFX_TIMER2=y

# Stacks and heaps

CONFIG_MAIN_STACK_SIZE=4096

CONFIG_HEAP_MEM_POOL_SIZE=16384

CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=4096

CONFIG_AT_MONITOR_HEAP_SIZE=4096

# Device power management

CONFIG_PM_DEVICE=y

# FOTA

CONFIG_HTTP_PARSER_URL=y

CONFIG_FOTA_DOWNLOAD=y

CONFIG_FOTA_DOWNLOAD_PROGRESS_EVT=y

CONFIG_DFU_TARGET=y

CONFIG_DOWNLOAD_CLIENT=y

CONFIG_DOWNLOAD_CLIENT_STACK_SIZE=4096

CONFIG_DOWNLOAD_CLIENT_MAX_FILENAME_SIZE=2048

CONFIG_BOOTLOADER_MCUBOOT=y

CONFIG_IMG_MANAGER=y

# FLASH

CONFIG_FLASH=y

CONFIG_FLASH_PAGE_LAYOUT=y

CONFIG_FLASH_MAP=y

CONFIG_STREAM_FLASH=y

CONFIG_MPU_ALLOW_FLASH_WRITE=y

CONFIG_IMG_ERASE_PROGRESSIVELY=y

# Settings

CONFIG_SETTINGS=y

CONFIG_SETTINGS_NVS=y

CONFIG_NVS=y

# nRF Cloud

CONFIG_NRF_CLOUD_MQTT=y

CONFIG_NRF_CLOUD_FOTA=n

CONFIG_NRF_CLOUD_AGNSS=y

CONFIG_NRF_CLOUD_AGNSS_FILTERED=n

CONFIG_NRF_CLOUD_PGPS=n

CONFIG_NRF_CLOUD_LOCATION=y

CONFIG_NRF_CLOUD_LOG_LEVEL_INF=y

CONFIG_NRF_CLOUD_GPS_LOG_LEVEL_INF=y

CONFIG_NRF_CLOUD_CLIENT_ID_SRC_INTERNAL_UUID=y

CONFIG_NRF_CLOUD_WIFI_LOCATION_ENCODE_OPT_MAC_RSSI=y

CONFIG_DATE_TIME=y

CONFIG_MODEM_INFO=y

CONFIG_MODEM_INFO_ADD_DATE_TIME=n

# UUID and JWT

CONFIG_MODEM_JWT=y

# MQTT client

#CONFIG_MQTT_KEEPALIVE=60

CONFIG_MQTT_CLEAN_SESSION=y

# AT command helper libraries

CONFIG_AT_PARSER=y

CONFIG_AT_MONITOR=y

# Disable TF-M logging.

# TF-M log sending will block until remote end is ready, when HWFC is used on UART1.

CONFIG_TFM_LOG_LEVEL_SILENCE=y

#

# SLM-specific configurations

#

CONFIG_SLM_CUSTOMER_VERSION=""

CONFIG_SLM_EXTERNAL_XTAL=n

# debug options

#CONFIG_ASSERT=y

#CONFIG_LOG_BUFFER_SIZE=16384

#CONFIG_SLM_LOG_LEVEL_DBG=y

#CONFIG_LOG_PRINTK=n

#CONFIG_LOG_MODE_IMMEDIATE=y

# For using external GNSS antenna

#CONFIG_MODEM_ANTENNA=y

#CONFIG_MODEM_ANTENNA_GNSS_EXTERNAL=y

# Habilitar soporte para PPP

CONFIG_SLM_PPP=y