Getting Started

Hardware Prerequisites

Hardware Setup

1. Insert your μSIM card into shield.

2. Attach the antenna to the shield.

3. Attach the shield to the Raspberry Pi.

4. Connect the Micro-USB cable to the shield and Raspberry Pi.

Software Setup

Enabling serial and I2C interface

Enable serial_hw and I2C interfaces by following instructions below:

  1. Run sudo raspi-config
  2. Select 5 Interfacing Options
  3. Enable P5 I2C
  4. For P6 Serial
  5. Disable Login shell to be accessible over serial
  6. Enable Serial port hardware
  7. Reboot

Library Installation

  1. Download the Cellular IoT Application Shield repository .
git clone
  1. Goto directory Sixfab_RPi_CellularIoT_Library.
cd Sixfab_RPi_CellularIoT_Library
  1. Complete the installation.
sudo python3 install

Internet connection

We have two options to reach the internet using mini PCle module with our Base HAT and Raspberry Pi.
  1. PPP (Point to Point Protocol)
  2. QMI (Qualcomm MSM Interface)
So which one among PPP & QMI should I select?


PPP(Point-to-Point Protocol) is a data layer communication protocol that is established through the serial port of the modem. These Serial port communication could be either the UART(/dev/ttyS0) or the serial exposed to USB(/dev/ttyUSB3). This serial is also used for both modem commands (AT commands) and responses. This connection is established by dial-up (ATD*99#)

PPP is easy to establish, widely used protocol, and flexible with the devices. PPP may show a drop of the connection while using the AT command set for other functionality of modem.

The LTE radio protocol has native support of TCP/IP and IPv6, so there is no need to actually wrap TCP/IP into PPP over the radio interface. The PPP protocol is just used between the computer and the modem to make the connection look like a legacy dial-up modem-based network connection.
To get rid of the legacy cruft, newer ways to present USB-connected LTE modems like QMI and MBIM have been developed.

Quectel modules offer QMI(Qualcomm MSM Interface) which is established as a real network interface, such as ethernet(typically shows as wwan0). The QMI is also counted among the non-AT protocols which is communicated over /dev/cdc-wdm0 port.

In order to establish a connection, proper qmi/gobinet proxy should be installed, which again depends on the chipset of the module/modem and the kernel of linux, gets a bit complicated. The QMI offers more accessible and faster connection compared to the PPP protocol.

We recommend QMI, if you are looking for faster connection, and for longer duration.

If you need to establish an internet connection for a short period of time and the date to be transferred is not high, you may stick to PPP.

# Follow the tutorials:

Updated 15 days ago

Getting Started

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