2.4.3.5 OTA Control Point
When written by a client, the OTA Control Point characteristic is an 8-bit enumerated value (known as the opcode) followed by zero or more parameter octets. The opcode is used by the server to determine which OTA Control operation is being initiated by the client. A notification of the OTA Control Point is used to provide a response to a client-initiated the OTA Control Point operation.
The structure of the OTA Control Point characteristic is defined in Table 3.6.
| Field | Requirement | Size (octets) | Description |
|---|---|---|---|
| Opcode | M | uint8 | Opcode of the client -initiated OTA Control operation |
| Parameter | M | variables | Dependent of the operations defined in Table 3.7 |
OTA Control Point procedures only can be initiated by client.
Client shall enable the Client Characteristic Configuration Descriptor (CCCD) of OTA Control Point on Server before issuing OTA Control Point procedure.
OTA Control operation and any associated opcodes are defined in Table 3.7.
| Opcode | Operation | Requirement | Applicable Response Values | Response Parameter |
|---|---|---|---|---|
| 0x00 | RFU | - | ||
| 0x01 | Response Code | M | N/A | N/A |
| 0x02 | Firmware Update Request | M | Success Not Supported Operation Failed Invalid Parameter | Max Fragmented Image Size (uint16) Current Firmware Version (uint32) |
| 0x03 | Firmware Update Start | M | Success Invalid State Not Supported | N/A |
| 0x04 | Firmware Update Complete | M | Success Invalid State | N/A |
| 0x05 | Device Reset Request | M | N/A | N/A |
| 0x06-0xFF | RFU | - |