NimbeLink Skylink Bedienungsanleitung

Configuring Linux ‘pppd’ for a

Skywire® 3G HSPA Modem

NimbeLink Corp

Updated: January 2019

PN 30252 rev 4

Table of Contents

Table of Contents 2

Introduction 3

1.1 Applicable Part Numbers 3

1.2 Prerequisites 3

PPP – 3G HSPA Modems 4

2.1 Overview 4

2.2 Elevate to root 4

2.3 Check for Updates 4

2.4 Install the “ppp” Package 5

2.5 Verify The Modem is Connected 5

2.6 Ubuntu Only: Load the “option” Driver 5

2.7 Write PPP Scripts 6

2.8 Take Down the Ethernet Interface 7

2.9 Bring Up the PPP Interface 8

2.10 Troubleshooting 9

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1. Introduction

1.1 Applicable Part Numbers

Orderable Device

Description

Carrier

Network

Type

NL-SWDK

Skywire Development Kit

Any

NL-AB-BBBC

Skywire BeagleBone Black Cape

Any

NL-AB-MPCIE

Mini-PCI Express Adapter Board

Any

NL-SW-HSPA

HSPA+, GPS, Global

Global

GSM

NL-SW-HSPA-B

HSPA+, GPS, Global

Global

GSM

1.2 Prerequisites

This document assumes you have completed the initial setup

of your modem and development kit. If you have not

completed those steps, refer to the Skywire® Development Kit

User Manual and complete the modem setup before

proceeding.

If you are using a device that is communicating via SSH,

Telnet, or any other type of Ethernet interface, you must

connect to it via USB or serial. Section 2.8 requires the

Ethernet interface to be taken down.

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2. PPP – 3G HSPA Modems

2.1 Overview

This example has been tested on the following distributions of Linux:

- Ubuntu Linux 14.04 LTS

- BeagleBone Black Debian 8.x

using a Skywire NL-LTE-TNAG GSM 4G LTE modem.

This example is written using Debian and Ubuntu. Some additional steps are necessary

to get PPP working on Ubuntu, and those steps will be covered in their respective

sections.

This example is also using AT&T a carrier.

2.2 Elevate to root

In order to make the changes necessary, it is necessary to login to the root account. To

do so, type the following command into the Terminal:

For Debian:

$ su -

For Ubuntu:

$ sudo -i

followed by the Enter key. You will be prompted to enter your password: enter it,

followed by the Enter key.

2.3 Check for Updates

Make sure that your Debian or Ubuntu system is up to date using the following

commands:

# apt-get update

# apt-get upgrade

2.4 Install the “ppp” Package

To install the ppp package, type the following command:

# apt-get install ppp

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2.5 Verify The Modem is Connected

To verify that our system can see the Skywire modem, type the following command:

# lsusb

followed by the enter key, and you should have an entry similar to the one below:

Bus 001 Device 002: ID 1bc7:1201 Telit

If so, the modem is connected properly. If not, verify the modem is connected properly

and run the command again.

2.6 Ubuntu Only: Load the “option” Driver

The Skywire modem does not properly enumerate automatically, if at all, under Ubuntu.

To enumerate the device, we need to load the “option” driver.

To get our device’s ID, type the following command:

# lsusb

followed by the Enter key. There should be a device listed according to the following

format that says “Telit”:

Bus 001 Device 002: ID 1bc7:1201 Telit

Make note of the eight-character hex code right before “Telit”. In the case of a

SW-LTE-TSVG, it is “1bc7:1201”.

To load the option driver, type the following into the Terminal:

# modprobe option

# echo 1bc7 1201 > /sys/bus/usb-

serial/drivers/option1/new_id

2.7 Write PPP Scripts

We need to write two scripts for PPP to reference when initializing the connection.

Note: We have a GitHub page with the necessary PPP files available for

customers to use located here:

https://github.com/NimbeLink/skywire-ppp-scripts

We highly recommend downloading that repo and following the instructions in

the files related to your modem. The other recommended option is to click on the

file you want and copy and paste directly from GitHub.

First, clone the repo and navigate to the cloned repo. Next, as superuser (root) copy the

file:

att-TNAG

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to:

/etc/ppp/peers/

or copy-and-paste the contents of:

att-TNAG

from the GitHub repo to

/etc/ppp/peers/att-TNAG

The contents of att-TNAG are shown below:

Next, copy:

att-TNAG-chat

to:

/etc/ppp/peers/

or copy-and-paste the contents of

att-TNAG-chat

from the GitHub repo to

/etc/ppp/peers/att-TNAG-chat

Make sure to replace [apn] with your APN. The contents of att-TNAG-chat are

shown below:

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2.8 Take Down the Ethernet Interface

A PPP connection requires that any existing Ethernet connection be taken down. To

bring down the Ethernet connection, type the following command:

# ifconfig eth0 down

(Optional) To verify that the Ethernet connection is down, type:

# ifconfig

followed by the enter key. eth0 should not be listed.

2.9 Bring Up the PPP Interface

To enable the PPP interface, type the following commands:

For Debian:

# pon att-TNAG

For Ubuntu:

# pppd call att-TNAG

followed by the enter key. You will see the second script you wrote appear on the

screen, followed by the network communication the Skywire modem is going through to

get connected.

Once the process is complete, test the connection:

#ping –c 2 www.google.com

and you should receive a response similar to this:

PING www.google.com (216.58.216.196) 56(84) bytes of data.

64 bytes from ord31s21-in-f4.1e100.net (216.58.216.196): icmp_seq=1 ttl=50 time=47.8 ms

64 bytes from ord31s21-in-f4.1e100.net (216.58.216.196): icmp_seq=2 ttl=50 time=90.6 ms

--- www.google.com ping statistics ---

2 packets transmitted, 2 received, 0% packet loss, time 1001ms

rtt min/avg/max/mdev = 47.818/69.237/90.656/21.419 ms

This indicates that your PPP connection is up and connected to the network.

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2.10 Troubleshooting

- If your PPP fails with the error 0x1 in Section 2.9, chances are your att-TNAG

file cannot see your att-TNAG-chat file. Ensure that the last part of line 3 of

the att file:

.../att-TNAG-chat

has the same name as your att-TNAG-chat file. The tool xxd may be

beneficial to ensure that there are no extra characters in the file and that the files

are named the same:

$ xxd att-TNAG

If you are still having issues, rename the last part of line 3 in the att-TNAG file

to:

.../attchat

and rename att-TNAG-chat to attchat and try again.

- If your PPP fails with the error 0x3 in Section 2.9, you may have poor signal

strength. Move the unit closer to a window for a better signal strength.

- If your PPP still fails with error 0x3 in Section 2.9, your APN may be incorrect.

Verify that your APN is correct in your att-TNAG-chat file.

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