Microchip RN4871 Manual

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RN4870/ Firmware 71 1.42 Release Note

9/ / 01 2021

1 Overview

This release note provides details on the firmware Rev 1.42 that is released for the

RN4870 and RN4871 modules.

2 New Features

• Rev 1.42 incorporates a new command to change the UART immediately

without the need for a reboot (unlike the SB command).

- SBI, <8-bit hex value>

- The input parameter is an 8-bit hex value in the range of 00 to 0B,

representing baud rate from 2400 to 921K as shown in table below.

Hex value

Baud rate

921000

460800

230400

115200

57600

38400

28800

19200

14400

9600

4800

2400

- Default: 03

- Example: SBI,07 //Set the UART baud rate to 19200

immediately

- Response: AOK //Success

- ERR //Syntax error or invalid parameter

3 Resolved Issues

• Fixed ANSSI vulnerabilities

• Fixed Sweyntooth vulnerabilities

• Modified the SM command to limit the range of timers 2 and 3. The value can

be set for these timers should be between 0 to 0x0FFE.

4 Known Issues

• The feature that is supported in the RN487x firmware ‘Accepted List’

supports public address and fixed static random address but not resolvable

random address.

5 Recommendations

Hardware Flow Control

When using Transparent UART for streaming data application, it is important to

include the RTS/CTS hardware lines and enable the hardware control feature.

Without hardware flow control, it is possible for host to cause buffer overflow on

RN4870 UART, which can result in instability.

Await for ‘AOK’ before sending next command

When issuing frequent RN4870/71 GATT access commands (SHW, SHR, SUW, SUR,

CHW, CHR, CUW, CUR), higher command throughput is achieved by disabling flow

control. The host MCU issuing the GATT commands must wait for a response, such

as “AOK” before using the next command.

Connectable advertisements on Android devices

When using NA or IA commands to create custom connectable advertisements, the

connectable FLAGS field must be included for Android devices connection. This is

done by preceding flags advertisement payload with the “NA,01,06” command. See

the example below:

NA,Z

NA,01,06

NA,FF,CD00F014AD11CF40063F11E5BE3E0002A5D5C51B00BC00BD

Handle enumeration after clearing GATT services

If clearing or updating the GATT service and characteristic tables, please ensure that

they remain same and not changed when using static characteristic handle values in

a script or by a remote BLE client. If the characteristic handle values change, please

ensure to update the script or remote BLE client with the new handle values.

6 Firmware Update protocol

The firmware update protocol and process are documented in the firmware update User

guide that is available in the RN4870 webpage.

Refer to the following Github page for an example code that executes the firmware

update with a PIC32 MCU:

https://github.com/MchpBTApps/BM71_MemoryProgramming

Microchip also provides PC tools to update firmware via a host PC. The tools are

available to download from the BM70 webpage.

Produkt Specifikationer

Mærke:	Microchip
Kategori:	Ikke kategoriseret
Model:	RN4871

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