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"AdvData" field structure (max 31 octets/bytes):

Lengthlength of the payload1 octet (15)



ManufacturerDatacompany identifier4 2 octets (15FF4F094F09)
Versionthe version of this advertisement structure1 octet (uint)
UserDatauser-configured part of the payload

1 octet (uint)

Secretoptionally encrypted (AES-ECB) part of the payload
  • secret: salt (for encryption) = 2 octets (uint)
  • secret: acceleration (acceleration in signed 8.8 fixed point format - acceleration of all 3 axis (0=x, 1=y, 2=z)) = 6 octets (uint)
  • secret: temperature (ambient temperature in Celsius in signed 8.8 fixed point format) = 2 octet (int)
  • secret: uptime (uptime in seconds) = 4 octets (uint)
  • secret: flags (bit-mask of flags) = 1 octet (uint)
  • secret: batteryPercentage (battery level in percent) = 1 octet (uint)


Info

Please note that all multi-byte values are in little-endian. Meaning, that if, for example, you want to get the temperature value and #14 and #15 octets indicate the temperature as "a1 19" ("plus" temperature) → the real temperature value is going to be (0x19a1)/256 = 25.6 C.

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MikroTik PDU Payload structure

015ManufacturerDataLengthlength of the payloadcompany identifier
1FFManufacturerDataTypemanufacturer specific datacompany identifier
24FManufacturerDataCompany identifiercompany identifierMikroTik
309ManufacturerDataCompany identifiercompany identifierMikroTik
401Versionthe version of this advertisement structure
500UserDatauser-configured part of the payload
6xx*Secretsecret: salt
7xx*Secretsecret: salt
8xx*Secretsecret: acceleration on the X-axis
9xx*Secretsecret: acceleration on the X-axis
10xx*Secretsecret: acceleration on the Y-axis
11xx*Secretsecret: acceleration on the Y-axis
12xx*Secretsecret: acceleration on the Z-axis
13xx*Secretsecret: acceleration on the Z-axis
14xx*Secretsecret: temperature
15xx*Secretsecret: temperature
16xx*Secretsecret: uptime
17xx*Secretsecret: uptime
18xx*Secretsecret: uptime
19xx*Secretsecret: uptime
2000Secretsecret: flags
2164xx*Secretsecret: batteryPercentage

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15ff4f09 (first 4 octets) → ManufacturerData. Is the same (constant data) for every MikroTik format's payloadLength (0x15 hex-to-dec is 21). Type (0xff). Company identifier (0x4f09).

01 (4th octet) → Current version of the payload's structure. Should be the same for every payload (constant data).

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