2021 Microchip Technology Inc. DS00003118C-Page 37
AN3118
Details of these commands and events are available in
AudioUARTCommandSet_v2 0x.pdf. This document is
part of the BM83 AT package. If the Bluetooth MAC ID
of a sink device is known, then a
Profile_Link_Back(0x17) command with type 7
can be used for establishing a connection. A Bluetooth
MAC ID is 6 bytes long and must be in byte reverse
order (LSByte first and MSByte last) to be used by this
command.
For example, if a BT MAC ID of a sink device is
0x0123456789AB, then the following UART
commands can be used from the MCU for establishing
connection:
17 07 00 04 AB 89 67 45 23 01
FIGURE 36: SENDING A RAW DATA THROUGH SPKCOMMANDSETTOOL
To get the name along with the BT MAC ID of the
nearby advertising sink devices, it is recommended
that the Device_Discovery(0x44) command
include an Extended Inquiry Response (EIR)
parameter. If the system has an MCU and display, then
the inquiry mode result can also be displayed on the
display and a user can choose the sink device and
establish the connection with the BM83 audio
transmitter. Once the Audio transmitter connects with
sink devices, link keys are saved in the memory and
upon power cycle, can automatically establish
connection with the previously connected sink devices
or the MCU can read these link keys and issue link
back command to establish a connection with
previously connected sink devices.
Note: The above command does not have prefix
and checksum. But, this command can be
sent directly as Raw Data from the Spk-
CommandSetTool MISC tab as shown in
the following figure.
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