UM1865 datasheet(103/132 Pages) STMICROELECTRONICS

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UM1865

Vendor specific commands

132

4.5.34

Aci_Gatt_Write_Charac_Descriptor

Description:

Start the procedure to write a characteristic value.

Event(s) generated:

A command status event is generated on the receipt of the command. When the procedure

is completed, a Evt_Blue_Gatt_Procedure_Cmplt event is generated.

Table 223. Aci_Gatt_Write_Charac_Descriptor

Command name

Parameters

Return

Aci_Gatt_Write_Charac_Descriptor (0xFD21)

Connection handle

AttrHandle

ValLen

AttrVal

Status

Table 224. Aci_Gatt_Write_Charac_Descriptor command parameters

Parameter

Size

Description

Connection handle

2 bytes

Connection handle for which the command is given

AttrHandle

2 bytes

Handle of the attribute to be written

ValLen

1 byte

Length of the value to be written

AttrVal

0-N bytes

Value to be written

Table 225. Aci_Gatt_Write_Charac_Descriptor return parameters

Parameter

Size

Description

Status

1 byte

0x00: Success

0x42: Invalid parameters

0x46: Not allowed

- If the exchange has already taken place

- If GATT is expecting response for previous request

- Already a request is in the queue to be sent

- Channel not open

- Already one GATT procedure is started

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