This application note presents the recovery mechanism of the Open AT Application Framework. The goal of the mechanism is to avoid infinite and uncontrolled reset loops in the firmware.

This Application Note describes the general structure of the Real Time Operating System implemented in Sierra Wireless modules, the RTOS features extended to developers and their restrictions, limitations and best practices to be followed when using the RTOS features.

This application note describes how to design a dual SIM solution. This function is used to switch between two SIMs. Two GPIOs are used to control the hardware switching between two SIMs.

AT Command Parser source code demonstrates and provides re-usable code showing how to subscribe and parser responses to both unsolicted and sent AT commands.

Simple Open AT sample code giving an example of managing a TCP Client socket.

This document gives an overview on using a private DNS server to resolve domain name on an AirPrime module.

This application note describes the three types of bus services - SPI, I2C, and parallel bus - used to communicate between two or more connected devices.

This application note gives an overview of the CMUX feature for multiplexing data over serial link, and describes the Sierra Wireless implementation of CMUX. The CMUX feature allows multiple virtual ports to be created on a physical serial link (3GPP TS 27.010).

There are currently multiple tools available to log the AirPrime Q26 Series, WMP Series and SL6087 to both debug Open AT applications and provide information to Sierra Wireless technical support for in depth analysis of problems. This document outlines the tools available, how they should be used to provide information to Sierra Wireless and developers and also suggests filters to be using in common scenario's

This application note explains the Sierra Wireless implementation for PLMN selection and reselection. It also includes a PLMN reselection FAQ.

This application note explains how to use the Watchdog Timer Reset function. Designed for remote devices requiring automatic operation, it generates a hardware reset to the module if the Open AT embedded software hangs, allowing the software to restart.

This application note explains how to use the PCB antenna on AirPrime GSM/GPRS modules operating on the 900 and 1800 MHz frequency bands.

This application note explains how to use the PCB antenna on AirPrime GSM/GPRS modules operating on the 850 and 1900 MHz frequency bands.

This application note describes some concepts in using Developer Studio and shows various snapshots in using it. These snapshots shows the sequence of using Developer Studio, and also functions as a quick start-up guide.