UM1865 datasheet(77/132 Pages) STMICROELECTRONICS

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UM1865

Vendor specific commands

132

Event(s) generated:

When this command is completed, a command complete event will be generated by the

controller which carries the status of the command and the handle of the characteristic

descriptor.

4.5.7

Aci_Gatt_Update_Char_Value

Description:

Update a characteristic value in a service.

Table 141. Aci_Gatt_Add_Char_Desc return parameters

Parameter

Size

Description

Status

1 byte

0x00: Success

0x47: Error

0x1F: Out of Memory

0x60: Invalid handle

0x61: Invalid parameter

0x62: Out of handle

0x63: Invalid Operation

0x64: Insufficient resources

Char_Desc_Handle 2 bytes

Handle of the characteristic descriptor

Table 142. Aci_Gatt_Update_Char_Value

Command name

Parameters

Return

Aci_Gatt_Update_Char_Value (0xFD06)

Serv_Handle

Char_Handle

Val_Offset

Char_Value_Length

Char_Value

Status

Table 143. Aci_Gatt_Update_Char_Value command parameters

Parameter

Size

Description

Serv_Handle

2 bytes

Handle of the service to which characteristic belongs

Char_Handle

2 bytes

Handle of the characteristic

Val_Offset

1 byte

The offset from which the attribute value has to be updated. If

this is set to 0, and the attribute value is of variable length, then

the length of the attribute will be set to the Char_Value_Length. If

the Val_Offset is set to a value greater than 0, then the length of

the attribute will be set to the maximum length as specified for

the attribute while adding the characteristic.

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