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GW nRF52811 UART communication
The host and device (nRF52) communicate with each other via UART using the following message format:

Note 1:
LEN
field determines the length of the payload (CMD
field is not included in LEN
).
Thus, the message with LEN
=0 contains only the CMD
byte and no Payload
.Note 2: CRC16 is calculated for
Header
(LEN
and CMD
) and Payload
.CRC is CRC-16-CCITT-FALSE, Polynomial Formula: x16+x12+x5+1, Polynomial: 1021
Constant | Value |
---|---|
STX | 0xCA |
ETX | 0x0A |
DELIMITER | 0x2C |

Command | CMD | Param | Value |
---|---|---|---|
RE_CA_UART_SET_FLTR_TAGS | 0x05 | Enable/disable BLE tags filter | 0...1 |
RE_CA_UART_SET_FLTR_ID | 0x06 | Manufacturer ID to be filtered (uint16) | 0...65535 |
RE_CA_UART_SET_CODED_PHY | 0x07 | Enable/disable BLE coded PHY | 0...1 |
RE_CA_UART_SET_SCAN_1MB_PHY | 0x08 | Enable/disable BLE scan PHY | 0...1 |
RE_CA_UART_SET_EXT_PAYLOAD | 0x09 | Enable/disable BLE extended payload | 0...1 |
RE_CA_UART_SET_CH_37 | 0x0A | Enable/disable BLE channel 37 | 0...1 |
RE_CA_UART_SET_CH_38 | 0x0B | Enable/disable BLE channel 38 | 0...1 |
RE_CA_UART_SET_CH_39 | 0x0C | Enable/disable BLE channel 39 | 0...1 |
RE_CA_UART_LED_CTRL | 0x0E | Turn on the LED for the specified time interval in milliseconds (uint16) | 0...65535 |
Command | CMD | Param 1 | Param 2 |
---|---|---|---|
RE_CA_UART_SET_ALL | 0x0F | Manufacturer ID to be filtered:
0...65535 | Bit-mask (uint8) for all state flags:
- bit 0: Filter tags
- bit 1: BLE coded PHY
- bit 2: BLE scan PHY
- bit 3: BLE extended payload
- bit 4: BLE chan 37
- bit 5: BLE chan 38
- bit 6: BLE chan 39 |
Ack | CMD | Param 1 | Param 2 |
---|---|---|---|
RE_CA_UART_ACK | 0x20 | Command to which the ACK responds:
0x05...0x0C, 0x0F | Ack state:
0 - OK
1 - Error |
Command
RE_CA_UART_SET_CH_37
:STX | LEN | CMD | State | DELIMITER | CRC16 | ETX |
CA | 02 | 0A | 01 | 2C | 78B6 | 0A |
Complete message:
CA 02 0A 01 2C B6 78 0A
Ack
RE_CA_UART_ACK
:STX | LEN | CMD | Command | DELIMITER | Ack | DELIMITER | CRC16 | ETX |
CA | 04 | 20 | 0A | 2C | 00 | 2C | 7EE7 | 0A |
Complete message:
CA 04 20 0A 2C 00 2C E7 7E 0A
Command
RE_CA_UART_SET_ALL:
STX | LEN | CMD | Filter ID | DELIMITER | State bit-mask | DELIMITER | CRC16 | ETX |
---|---|---|---|---|---|---|---|---|
CA | 05 | 0F | 0499 | 2C | 7D | 2C | 6121 | 0A |
Complete message:
CA 05 0F 99 04 2C 7D 2C 21 61 0A
Ack
RE_CA_UART_ACK:
STX | LEN | CMD | Command | DELIMITER | Ack | DELIMITER | CRC16 | ETX |
---|---|---|---|---|---|---|---|---|
CA | 04 | 20 | 0F | 2C | 00 | 2C | C2A2 | 0A |
Complete message:
CA 04 20 0F 2C 00 2C A2 C2 0A

Request | CMD | Param |
---|---|---|
RE_CA_UART_GET_DEVICE_ID | 0x18 | - |
Response | CMD | Param 1 | Param 2 |
---|---|---|---|
RE_CA_UART_DEVICE_ID | 0x11 | Device ID
(8 bytes) | MAC Address
(6 bytes) |
Command :
STX | LEN | CMD | CRC16 | ETX |
---|---|---|---|---|
CA | 00 | 18 | 8E36 | 0A |
Complete request message:
CA 00 18 36 8E 0A
Response:
STX | LEN | CMD | Device ID | DELIMITER | MAC Addr | DELIMITER | CRC16 | ETX |
---|---|---|---|---|---|---|---|---|
CA | 10 | 11 | 0x38E11A5878A79840 | 2C | 2C:9C:8E:2D:25:C8 | 2C | 677F | 0A |
Complete response message:
CA 10 11 40 98 A7 78 58 1A E1 38 2C C8 25 2D 8E 9C 2C 2C 7F 67 0A

Report | CMD | Param 1 | Param 2 | Param 3 |
---|---|---|---|---|
RE_CA_UART_ADV_RPRT | 0x10 | MAC address
(6 bytes) | Advertisement:
Variable length (MAX 31 Bytes) | RSSI in dB:
-128...127 |
Note: The length of the Advertisement is determined by the LEN field in the Header.
Adv_Len := LEN - 10
STX | LEN | CMD | MAC Addr | DELIMITER | Adv | DELIMITER | RSSI | DELIMITER | CRC16 | ETX |
---|---|---|---|---|---|---|---|---|---|---|
CA | 29 | 10 | 06:AD:E0:B9:A5:C6 | 2C | 02 01 06 1B FF 99 04 05 14 64 47 25 C4 41 00 34 00 00 04 1C A9 36 11 01 58 C6 A5 B9 E0 AD 06 | 2C | D9 | 2C | 0811 | 0A |
Complete report message:
CA 29 10 C6 A5 B9 E0 AD 06 2C 02 01 06 1B FF 99 04 05 14 64 47 25 C4 41 00 34 00 00 04 1C A9 36 11 01 58 C6 A5 B9 E0 AD 06 2C D9 2C 11 08 0A

Request | CMD | Param |
---|---|---|
RE_CA_UART_GET_ALL | 0x19 | - |
STX | LEN | CMD | CRC16 | ETX |
---|---|---|---|---|
CA | 00 | 19 | 9E17 | 0A |
Complete configuration request message:
CA 00 19 17 9E 0A
Last modified 1yr ago