User's Guide

www.lm-technologies.com

LM074 SPP with GAP Central Application v1.1

1. Introduction

This document describes the functionality of the “SPP with GAP Central” application.

1. SPP with GAP Central application specific AT commands and information

2. All AT commands and default configurations on device

3. Over the Air Firmware Upgrade procedure

4. Secure simple pairing procedure

The LM074 is a dual mode module with the capability for simultaneous connections

to Bluetooth (v1.0 – v3.0), and Bluetooth low energy devices. LM Technologies

supports various firmware applications on the LM074 module enabling users to

develop their own applications with AT commands.

2. Functionality of SPP with GAP Central application

In the SPP with GAP Central application the LM074 can either be a SPP Master or

Slave; or dual mode with one SPP connection at a time. The SPP role supports

BOND, ACON, and features similar to those of LM Technologies’ legacy products such

as the LM048, LM072 and LM400,

For Bluetooth low energy, it will be in the GAP Central role and can establish

connections to up to five low energy peripherals simultaneously. Users can have a

maximum of six active connections with this application (five low energy and one

SPP). Data can be transferred between devices using AT commands.

For the Bluetooth low energy GAP Central role, the user can perform functions

normally performed by Android tablets or phones. A user can discover nearby

Bluetooth low energy peripherals, and up to ten devices will be reported. They can

then connect to any of those devices and read or write data on various services or

characteristics with the help of AT commands. The Bluetooth low energy connection

also supports whitelisting. If you add the paired devices to the whitelist it will only

report advertising packets from the devices added to the whitelist, or only connect to

devices on the whitelist.