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 how to interface an external battery charging solution with an AirPrime wireless module. It is useful if you have the following requirements: Li-Polymer battery used Possible drops of the battery voltage below its over discharge threshold (~2.8V) Only a DC voltage source available to charge the battery (impossible to connect an external charger)

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.

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).

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

This application note describes the steps to open an FCM flow (V24 serial flow, GSM flow or GPRS flow) in an application. It includes a sample using a custom AT command to read data from the flash and send them to the external application using the FCM V24 serial flow.

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.