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Pico-BLE User manual
found
ER+3\r\n
The received AT command did not receive a carriage return and line feed, that is, \r\n
ER+4\r\n
The parameter sent by the command is out of range, or the command format is incorrect.
Please check your AT commands
ER+7\r\n
The MCU sends data to the mobile phone, but the mobile phone does not open notify. In the
successful state of BLE connection
Focus on the description of notify [monitoring]. After the test APP on the mobile phone
is connected to the Bluetooth chip, notify must be turned on. The bluetooth chip can
send data to the mobile phone. When the mobile phone sends data to the Bluetooth chip,
it is enough to use the write feature.
Chip power-on callback information settings
AT+CR00\r\n
Turn off postback messages for power-on. Be careful to restart the power after setting
Enable the return message of chip power-on. It is valid at the next power-on. Be careful to
AT+CR01\r\n
restart the power after setting
Note: After this function is turned off, it will also turn off the OK or ER+X return information that is
actively returned after the AT command is executed. It is recommended to keep it turned on here.
Transparent transmission description
1. After the Bluetooth connection, the module automatically enters the
transparent transmission mode. Except for the completely correct AT
command, the rest of the data will be transparently transmitted.
2. The maximum amount of data that can be handled in a single time is
1024 bytes. SPP recommends that it should not exceed 512 bytes at a
time.
3. The MTU (maximum communication packet length) of the mobile phone
APP generally defaults to 20 bytes for 1 data packet; when the data
packet sent by the module exceeds 20 bytes, the module will
automatically divide the packet according to the set MTU; you can
Modify the MTU to modify the data interaction speed (the larger the
MTU, the faster the data interaction speed).
版本：V1.0，日期：2021 年 12 月 16 日
10 / 10
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