WIRELESS CONNECTIVITY & SENSORS
User manual Proteus-II
No configuration of the module is needed for this operating mode. The module shall be set
to factory settings if reconfigured before so it uses the default user settings. In this case, the
UART uses 115200 Baud 8n1 and static passkey pairing is used as authentication method.
If a configuration of the module is still needed (e.g. when another UART baud rate needs
to be chosen), the module has to be started in normal mode and the
may be
used to update the user settings.
It is permitted to modify any user setting to change the behaviour of the peripheral only mode.
Nevertheless, we recommend to update only the following parameters to run the device in
factory state with minimal adaptions:
•
(change the UART baud rate, default value "115200")
•
(enable or disable the flow control)
•
(change the default static passkey, default value "123123")
•
and
(determine the content of the advertising packet)
10.3. More information
10.3.1. Radio
In factory state the following holds:
• In peripheral only mode a new 8-digit device name is automatically generated by the
. In case of the
equals 0x0018DA123456 the device name is "A-123456".
This is a workaround for iOS, which does not allow access to the BTMAC for received
Bluetooth
®
frames.
• The content of the advertising packet was changed in peripheral only mode. The TX
power information block was removed, as the device name was extended to 8 digits.
See also the user setting
to adapt the content of the advertising packet.
10.3.2. UART
• The data sent to the UART is buffered in the Proteus-II up to a maximum payload of
1015 Bytes. When no new Byte was received for 20 ms, the data will be transmitted
via radio to the connected Bluetooth
®
LE device. If the data is larger than the MTU of
the connection, the data is sent via radio in several fragments, with one fragment per
connection interval.
• To enable a fast transmission of data packets a large MTU of the Bluetooth
®
LE connec-
tion is helpful. The Proteus-II supports up to 243 Bytes Bluetooth
®
LE packet payload
(corresponding to a MTU of 247 Bytes), which may be negotiated by the central device
(using a MTU request). If no MTU request is requested by the connecting central device
the value of 19 Bytes payload per Bluetooth
®
LE packet and connection interval as given
by the Bluetooth
®
4.0 standard is used (compatibility mode to Bluetooth
®
LE 4.0 devices).
Order code 2608011x24010
139
Version 1.11 , July 2022