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C1-Public
5.3 Configuration and handling
5.3.1 Configuring advertising interval
Press the SW2 button on the C209 to change the advertising interval.
When SW2 is pressed, the advertising interval cycles through the available advertising intervals. For
best performance, it is advisable to use the fastest advertising interval. The LED will blink shortly to
indicate the advertising interval, with 1 blink indicating the fastest advertising.
Figure 25: C209 with cover and buttons
C209 tags are simply configured over the UART interface using AT commands.
The AT commands that can be used to configure the interface are described in
Table 5.
Command Description
AT+UMLA=1 Read Local MAC address
AT+GMM
Read the model identifier, NINA-B4-TAG
AT+TXPWR
=<valid_tx_power> <valid_tx_power> can be one of: -40, -30, -20, -16, -12, -8, -4, 0, 2, 3, 4, 5, 6, 7, 8 (dBm)
AT+TXPWR? Query the set TX power
Table 5: C209 AT commands
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For
+TXPWR
to take effect the software must be reset – either by pressing the reset button or power
cycling the module. The configuration is persistently stored in flash.
All commands are echoed and responded with either
\r\nOK\r\n
or
\r\nERROR\r\n
, and should be
terminated with
\r.
☞
The UART interface is available for 10 seconds after reset with the settings 115200 bps, with no
flow control.
5.3.2 Enabling/disabling advertising
Press and hold the SW2 button for ~3 seconds to enable/disable advertising. If the tag is advertising,
press and hold the button to stop it advertising. The onboard RGB LED blinks blue when advertising
is enabled. The blinking interval correlates to the advertising interval.