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14 Transparent

Transparent Mode AT commands. In transparent mode all data that is sent from the host to the UART is forwarded to the socket or SPS link that is configured for transparent mode, and the all data that arrives on this link is sent to the UART. Transparent mode is limited to one link at a time.

14.1 AT Commands

AT Command
Description
Transparent Mode
Transparent Mode Persistent
Transparent Mode Persistent Clear

14.1.1 AT+UTM - Transparent Mode

Use this command to directly switch to transparent mode for a specific SPS link or a socket.
Syntax
AT Command
Description
AT+UTM=<link_type>,<handle>
Enter Transparent Mode
Defined values
Parameter
Type
Description
handle
integer
For SPS links, set this to the connection handle
For sockets, set this to the socket handle
link_type
enumerator
Valid values:
0: BLE SPS Link
1: Socket

14.1.2 AT+UTMP - Transparent Mode Persistent

This command is used for automatically setting up a transparent mode connection on boot.
Syntax
AT Command
Description
AT+UTMP=<link_type>,<config_id>
Set persistent transparent mode for link

Notes:
Requires AT&W and a reboot before taking effect.
AT+UTMP?
Get current persistent transparent mode configuration
Response
Description
+UTMP:<link_type_read>,<config_id>
Successful read response.
Defined values
Parameter
Type
Description
config_id
integer
For SPS, set this to the config_id returned by AT+UBTP.
For sockets, set this to the config_id returned by AT+USOP.
link_type
enumerator
Valid values:
0: BLE SPS Link
1: Socket
link_type_read
enumerator
Valid values:
-1: No link type set
0: BLE SPS Link
1: Socket

14.1.3 AT+UTMPC - Transparent Mode Persistent Clear

Clears the persistent link configuration for transparent mode.
Syntax
AT Command
Description
AT+UTMPC
Clears persistent transparent mode settings

Notes:
Can be stored using AT&W.
Last updated: 04 March 2025
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