RN4677-V/RM100 Datasheet RN4677-V/RM100, RN-4677-PICTAIL | P13-P15

Introduction

 2015 Microchip Technology Inc. DS50002377A-page 13

1.5 MAKING A BLUETOOTH CONNECTION

RN4677 can act as a master to initiate a connection to another Bluetooth device. The

following steps can be used to start a Bluetooth Classic connection:

1. Type $$$ to enter Command mode.

2. Type + to enable echo.

3. Type I to inquire the Bluetooth Classic devices in the neighborhood.

4. Wait until the inquiry is finished and find the MAC address of the device to be

connected.

5. Type C,<0,1>,<MAC address> to attempt a connection with a remote device.

6. Once connected, characters entered in the terminal emulator is sent to the

remote peer, and vice versa.

7. To terminate the connection, type $$$ to get into Command mode, then type

command K,1.

In a similar manner, the RN4677 can initiate BLE connection in Generic Access Profile

(GAP) Central mode to another BLE device supporting the "Transparent UART"

service. The command sequence is listed below:

1. Type $$$ to enter Command mode.

2. Type + to enable echo.

3. Type IL to inquire BLE devices in the neighborhood.

4. Wait until the inquiry is finished and find the MAC address or address type of the

device to be connected.

5. Type C,<0,1>,<MAC address> to attempt a connection with remote device,

where the first parameter indicates the address type that can be found in the

inquiry result: 0 for public address and 1 for private address.

6. Once connected, characters typed in the terminal emulator is sent to the remote

peer, and vice versa.

7. To terminate the connection, type $$$ to get into Command mode, then type

command K,1.

1.6 SECURITY MODES

RN4677 supports encryption and authentication with security modes from 1 to 4. The

definition of security mode are as follows:

• Security mode 1: Passkey Confirm

• Security mode 2: Just Works

• Security mode 3: Passkey Entry

• Security mode 4: Legacy Pin Code

For Bluetooth Classic, all security modes are supported. For BLE, only security modes

1 to 3 are supported.

For security modes 1 and 3, by default, a random 6-digit security pin is generated and

displayed at one end of the connection and the other end must enter the security pin.

Optionally, if both connection ends are RN4677, it is possible to fix the 6-digit security

pin for BLE by supplying 6-digit pin to command SP instead of 4-digit pin for legacy Pin

Code mode.

RN4677 Bluetooth

4.0 Dual Mode Module User’s Guide

DS50002377A-page 14  2015 Microchip Technology Inc.

NOTES:

 2015 Microchip Technology Inc. DS50002377A-page 15

RN4677 BLUETOOTH

4.0

DUAL MODE MODULE

USER’S GUIDE

Chapter 2. Command Reference

2.1 INTRODUCTION

RN4677 supports a variety of commands for controlling and configuration. This section

describes these commands in detail and provides examples.

2.2 COMMAND SYNTAX

The ASCII command syntax is a keyword followed by optional parameters.

• ASCII commands are divided into multiple groups:

- Set Commands

- Get Commands

- Action Commands

• All commands are one, two or three case-insensitive characters

• Delimit command and any argument with a comma

• Text data is case sensitive such as Bluetooth name

• All commands end with carriage return ('\r', \x0d)

• Get commands return the value to retrieve. Most of the other commands return

either AOK as a positive response or ERR as a negative response.

2.3 SET COMMANDS

Set commands change RN4677 configurations and take effect after rebooting via R,1

command, hard Reset or power cycle.

2.3.1 SA,<1-4>

The Set Authentication command sets the authentication method when a remote

device attempts to connect, where <value> is one of the values shown in Tabl e 2- 1.

Once a remote device exchanges pin codes with the RN4677 device, a link key is

stored for future use. The device automatically and permanently stores up to four peer

devices in flash memory using the First-In, First-Out (FIFO) method.

TABLE 2-1: SET AUTHENTICATION VALUES

Value Description

1 Secure Simple Pairing (SSP) Pin Code Confirm mode

If this option is set when authenticating the link, a 6-digit pin is sent to UART. On the

remote side, the same 6-digit pin is shown and asked to be confirmed. For BLE, if

the command

SP sets the 6-digit pin code, the pin code is fixed to be displayed and

confirmed on the remote side; otherwise, a random 6-digit pin code is generated for

confirmation.

2 (Default) SSP “Just Works” mode

This mode works without any request to display or input any security pin.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P21 P22-P24 P25-P27 P28-P30 P31-P31

RN4677-V/RM100

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RN4677-V/RM100

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