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GW nRF52811 UART communication

Message format

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

Defines

Constant
Value
STX
0xCA
ETX
0x0A
DELIMITER
0x2C

SET sequence

Command format

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
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 message

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

Example: Set the state of channel 37

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

Example: Set all configuration

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

GET sequence

Request message

Request
CMD
Param
RE_CA_UART_GET_DEVICE_ID
0x18
-

Response message

Response
CMD
Param 1
Param 2
RE_CA_UART_DEVICE_ID
0x11
Device ID (8 bytes)
MAC Address (6 bytes)

Example: Request DEVICE_ID

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 sequence

Report message

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

Example of report

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

CONFIGURATION REQUEST sequence

CFG Request message

Request
CMD
Param
RE_CA_UART_GET_ALL
0x19
-

Example: Configuration request on the device side

STX
LEN
CMD
CRC16
ETX
CA
00
19
9E17
0A
Complete configuration request message: CA 00 19 17 9E 0A