At+Blecfgmtu-Sets Gatt Mtu Length; At+Blegattssrvcre-Gatts Creates Services - Espressif Systems ESP32 Instruction Set

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Example
6.2.15. AT+BLECFGMTU—Sets GATT MTU Length
Command
s
Response
Parameter
Notes
Example
6.2.16. AT+BLEGATTSSRVCRE—GATTS Creates Services
Commands
Response
Parameter
Notes
Example
Espressif
AT+BLEINIT=1 // role: client
AT+BLECONN=0,"24:0a:c4:09:34:23"
AT+BLEDATALEN=0,30
Query Command:
AT+BLECFGMTU?
Function: to query the length of the
maximum transmission unit (MTU).
+BLECFGMTU:<conn_index>,<mtu_size>
OK
<conn_index>: index of BLE connection; only 0 is supported for the single connection right
now, but multiple BLE connections will be supported in the future.
<mtu_size>: MTU length
Only the client can call this command to set the length of MTU. However, the BLE
•
connection has to be established first.
The actual length of MTU needs to be negotiated. The "OK" response only means that the
•
MTU length must be set. So, the user should use command AT+BLECFGMTU? to query the
actual MTU length.
AT+BLEINIT=1 // role: client
AT+BLECONN=0,"24:0a:c4:09:34:23"
AT+BLECFGMTU=0,300
Execute Command:
AT+BLEGATTSSRVCRE
Function: The Generic Attributes Server (GATTS) creates BLE services.
OK
None
• If using ESP32 as a BLE server, a service bin should be downloaded into Flash in order
to provide services.
‣ To learn how to generate a service bin, please refer to esp32-at/tools/readme.md.
‣ The download address of the service bin is the "ble_data" address in
at_customize.csv.
• This command should be called immediately to create services, right after the BLE server
is initialized. If a BLE connection is established first, the service creation will fail.
AT+BLEINIT=2 // role: server
AT+BLEGATTSSRVCRE
50 97 !
Set Command:
AT+BLECFGMTU=<conn_index>,<mtu_size>
Function: to set the length of the maximum
transmission unit (MTU).
OK // the command is received
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6. BLE-Related AT Commands
esp32-at/
2019.06