User's Manual

4.3 Sample Payload Parsing Guide

Messages:

1F 40 00 58 04 C6 EF 02 0A 16 03 F8

1F 41 E8 2B F4 FF F8 00 23 FC 18 08

1F 42 40 00 00 4C 09 D4 87 0D 13 5C

1F 43 DC 96 74 07 BD A8 D3 F7 31 0A

1F 44 08

Parsing:

Group Number: 1F

Message Count (Index + 1): 5

Note: Index is the lower nibble of the second byte of each SIGFOX message 40 -> Index 0, 41 -> Index 1, 42 ->

Index 2, etc.

Protocol Version: 00

Time Stamp: 58 04 C6 EF

1. Convert from hex to decimal: 0x5804C6EF = 1476708079

2. Open http://www.epochconverter.com/

3. Enter the seconds since epoch (Jan 1. 1970)

4. 58 04 C6 EF -> Mon, 17 Oct 2016 12:41:19 GMT

Latitude: 02 0A 16 03

1. Convert from hex to binary to check for negative value (2’s compliment format)

2. 0x020A1603 = 0010000010100001011000000011b (leading bit is zero -> positive value)

3. Convert from hex to decimal

4. 0x020A1603 = 34215427

5. Move decimal 6 places

6. 34.215427° N

Longitude: F8 E8 2B F4

1. Always check the binary conversion for a negative number (2’s compliment format)

2. 11111000111010000010101111110100= F8E82BF40x b (leading bit is 1 -> negative value)

3. Convert from binary to decimal using 2’s compliment:

a. http://www.exploringbinary.com/twos-complement-converter/

4. 11111111110001011100100000101110b <-(2’s compliment) -> --119002124

5. Move 6 decimal places: -119.002124 ° W

Accel X: FF F8 = 0xFFF8 = 1111111111111000b (leading bit is 1, 2’s compliment for negative value) = -8mG

Accel Y: 00 23 = 0x23 = 00100011b (leading bit is 0, positive value) = 35mG

Accel Z: FC 18 = 0xFC18 = 1111110000011000b (leading bit is 1, 2’s compliment, negative value) = -1000mG

Temperature: 08 40 = 0x840 = 2,112, reference the table below for approximate temperature value

Ambient Light: 00 00 (should always read 00 00 because of enclosure 0x0000 = 0 lux

Wi-Fi BSSID 1: 4C 09 D4 87 0D 13

Wi-Fi BSSID 2: 5C DC 96 74 07 BD

Wi-Fi BSSID 3: A8 D3 F7 31 0A 08