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BearPi BM-H21E AT Usage

Device Information

Device Model: BearPi BM-H21E
Main Chip: Hi2821
Supports BLE 5.4 + SLE 1.0 Dual-Mode Coexistence
Onboard User Button + Power-on Serial TXRX Pins + Status Indicator + NearLink Module and Built-in Module Antenna

BearPi AT Command Usage Tutorial

Set Server mode
Terminal window
```
AT+SETMODE=1
```
Set Server MAC address
Terminal window
```
AT+SETSLEADDR=111122220009
```
Set Server name to SERVER
Terminal window
```
AT+SSETNAME=SERVER
```
Start the server to await connection
Terminal window
```
AT+SSERVER=1
```
View connected Clients
Terminal window
```
AT+SCLIST
```
Received the string “123456” from Client named CLIENT1
Terminal window
```
+SRECVDATA:CLIENT1,313233343536
```
Send string “123” to Client named CLIENT1
Terminal window
```
AT+SSEND=CLIENT1,123
```
Disconnect from Client named CLIENT1
Terminal window
```
AT+SKILLCLIENT=CLIENT1
```

Set to Client mode
Terminal window
```
AT+SETMODE=0
```
Set Client MAC address
Terminal window
```
AT+SETSLEADDR=111122220001
```
Set Client name to CLIENT1
Terminal window
```
AT+CSETNAME=CLIENT1
```
Search and Retrieve Server List
Terminal window
```
AT+CSLIST
```
In this process, the search will be automatically recognized and output to the serial page until it completely returns OK
Connect to a server named SERVER
Terminal window
```
AT+CCONNECT=SERVER
```
Send “123456” String (in HEX format) to Server Named SERVER
Terminal window
```
AT+CSEND=313233343536
```
Receive “123” String (in HEX format) from Server
Terminal window
```
+CRECVDATA:313233
```
Disconnect from the Server
Terminal window
```
AT+CDISCONNECT
```

Set to Client mode
Terminal window
```
AT+SETMODE=0
```
Set Client MAC address
Terminal window
```
AT+SETSLEADDR=111122220002
```
Set Client name to CLIENT2
Terminal window
```
AT+CSETNAME=CLIENT2
```
Search and Retrieve Server List
Terminal window
```
AT+CSLIST
```
In this process, the search will be automatically recognized and output to the serial page until it completely returns OK
Connect to a server named SERVER
Terminal window
```
AT+CCONNECT=SERVER
```
Send “123456” String (in HEX format) to Server Named SERVER
Terminal window
```
AT+CSEND=313233343536
```
Receive “123” String (in HEX format) from Server
Terminal window
```
+CRECVDATA:313233
```
Disconnect from the Server
Terminal window
```
AT+CDISCONNECT
```