AXIOMATIC AX141100, Руководство пользователя

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UMAX141100 Version 1.0.6. Preliminary Documentation – May be subject to change 23 - 36
5. SPP Communications
The communications between a smart device such as a phone or a tablet and the CAN2BT device
is based on Bluetooth Serial Port Profile (SPP). By default, the CAN2BT firmware declares itself as
a SPP device (UUID: 00001101-0000-1000-8000-00805F9B34FB)
The messages are transferred in binary format, least significant byte first. The list of supported
proprietary messages is shown below.
5.1. Overall message format
There is an ack response sent by the CAN2BT device after receiving the configuration messages.
The overall message format:
Byte 0 Byte 1 Byte 2 Byte 3 … Byte n+2 Byte n+3 Byte n+4 Byte n+5 Byte n+6
<msg type> <length> <payload 0> <payload 1> … <payload length-1> <crc32> <crc32> <crc32> <crc32>
Table 4 – Overall message format
in which the <msg type> is as listed in below. <length> is full message length without the four CRC32
bytes. CRC32 is selected because the support for it is readily available in Android.
All data that is expressed as Byte 0, Byte 1, … in the message descriptions below, is expected to be
either 16 bits or 32 bits wide data, broken down to bytes (8 bits) least significant byte first. The only
exception is the PIN code data, that is expected to be formatted one digit per byte. The PIN codes
are hard formatted to have 6 digits.
Available CAN baudrate options include: 0 – 50k, 1 – 100k, 2 – 125k, 3 – 250k, 4 – 500k, 5 – 1M
5.2. Message types
Message type Direction <msg type> byte
CAN data with StdID SD
*
‐ > CAN2BT 0x12
CAN data with ExtID SD
*
‐ > CAN2BT 0x13
CAN data with StdID CAN2BT ‐ > SD
*
0x21
CAN data with ExtID CAN2BT ‐ > SD
*
0x31
MAP write SD
*
‐ > CAN2BT 0x34
MAP write response CAN2BT ‐ > SD
*
0x43
MAP read SD
*
‐ > CAN2BT 0x45
MAP read response CAN2BT ‐ > SD
*
0x54
Download Flash contents SD
*
‐ > CAN2BT 0x56
Download Flash contents response CAN2BT ‐ > SD
*
0x65
Download Flash contents ACK SD
*
‐ > CAN2BT 0x57
Download Flash contents ACK response CAN2BT ‐ > SD
*
0x75
Change configuration SD
*
‐ > CAN2BT 0x67
Change configuration response CAN2BT ‐ > SD
*
0x76
LED state SD
*
‐ > CAN2BT 0x78
LED state response CAN2BT ‐ > SD
*
0x87
*
SD = Smart Device, a phone or a tablet
Table 5 – Proprietary SPP message types