Function packet format

Frame format encoding of the sd_ble_gatts_hvx packet.

Operation Code = 0xA6 (166) for sd_ble_gatts_hvx, see BLE_GATTS_SVCS.

The parameters provided as input to sd_ble_gatts_hvx are encoded in the following order:

- 1 byte:		Operation Code, Value = 0xA6 (166)
- 2 bytes:		Connection Handle
- 1 byte:		HVX Parameters Present
		0x00 if p_hvx_params is a NULL pointer
		0x01 otherwise
- 7 ... n bytes:	ble_gatts_hvx_params_t	Conditional: HVX Parameters

As shown in Figure 1, the data inside ble_gatts_hvx_params_t are encoded as:

- 2 bytes:	ble_gatts_hvx_params_t::handle	Characteristic Value Handle
- 1 byte:	ble_gatts_hvx_params_t::type	Indication or Notification, see GATT Handle Value operations
- 2 bytes:	ble_gatts_hvx_params_t::offset	Offset Value
- 1 byte:		Data Length Field Present
		0x00 if p_len is a NULL pointer
		0x01 otherwise
- 2 bytes:	ble_gatts_hvx_params_t::p_len	Conditional: Length of Data
- 1 byte:		Data Present
		0x00 if p_ is a NULL pointer
		0x01 otherwise
- 0 ... n bytes:	ble_gatts_hvx_params_t::p_data	Conditional: Data Content
		The number 'n' of bytes encoded in the packet is defined in the Data Length field.

Figure 1: Packet format for sd_ble_gatts_hvx function.

Response packet format

Frame format encoding of the sd_ble_gatts_hvx response packet.

In case of an error, the following data is encoded:

- 1 byte:		Operation Code, Value = 0xA6 (166)
- 4 byte:		nRF Error Code

Figure 2: Packet format for sd_ble_gatts_hvx error response.

In case of a successful command, i.e. 'nRF Error Code' = NRF_SUCCESS, the following data is encoded:

- 1 byte:		Operation Code, Value = 0xA6 (166)
- 4 bytes:		nRF Error Code
- 2 bytes:		Number of Data written, if 'nRF Error Code' is NRF_SUCCESS
		Otherwise nothing is encoded.

Figure 3: Packet format sd_ble_gatts_hvx response packet.