MotionSensor 15x (0018)¶

5.0.0 - 2026-09-25¶

• MT protocol version 1.17

Added¶

• Added properties:

  • 0x8127 - Firmware update info.

  • 0x8201 - Debug

  • 0x8104 - Time

  • 0x826A - Measurement reporting interval

  • 0x8306 - Start Uplink Quality Test

  • 0x8307 - Uplink Quality Test Result

  • 0x838200 - Temperature Backfill

  • 0x838202 - Humidity Backfill

  • 0x838203 - Light Intensity Backfill

  • 0x838205 - Motion Backfill

  • 0x8331 - Flush Backfill

  • 0xFF01 - Time Sync Retries

• Property 0x8120 - Firmware Update State extended with broadcast flag. This extension is only present during firmware broadcast.

• Firmware gap-fill and resume

• Time sync improvements

• Timestamped data with optional backfill

• Uplink quality test

• Connection ping (secure mode)

• Report all properties when device connects

Changed¶

• In secure mode, measurements are reported as timestamped data

• In secure mode, motion is reported as timestamped data

• In secure mode, motion property is no longer reported

• Require aborting a completed firmware download (state 100/128) before starting a new one

• Report 0x9900 - Button 0 Counter as event/timestamped. This replaces 0x998000 - Button 0 Pressed.

• Default value for 0x8204 - motion to not in motion timeout changed from 10s to 60s

Fixed¶

• Firmware update could not be aborted manually after firmware update timeout

• Factory reset using long button press was not working in service mode

• Potential upstream packet loss

• No-motion event directly followed by new motion event

• Motion could sometimes get stuck at 0

• Firmware update fixes and improvements

Removed¶

• Firmware block timeout for firmware packet received by broadcast

• Device reset after long time disconnected while in Connected mode. Keeping this would break the timestamped data sequence

• Demo mode

4.0.0 - 2025-11-10¶

• MT protocol version 1.13

Added¶

• Secure mode support (connected mode only)

• Service mode (factory reset, DFU mode)

• New properties:

  • 0x8005 - Production Info Extended

  • 0x8008 - Public key

  • 0x800A - Provision

  • 0x800B - Network ID

  • 0x800C - Network Fingerprint

  • 0x800D - Provision Legacy

Changed¶

• New storage mode advertisement format. Adv. name: MT0018/MT0018S (BREAKING)

Fixed¶

• Starting firmware update while another firmware broadcast was in progress

• Button press event reported wrong value length

• Power consumption reduced when in connected mode, but no connection to a parent

3.2.1 - 2025-05-13¶

• MT protocol version 1.10

Fixed¶

• Internal fix for production test.

3.2.0 - 2025-04-07¶

• MT protocol version 1.10

Added¶

• Motion filter with support to enable/disable (default disabled).

• Identifier support

  • 0x8267 - PIR Motion Filter

Changed¶

• Improved storage mode to make device deployment more responsive.

Fixed¶

• Various internal fixes.

3.1.1 - 2024-02-05¶

• MT protocol version: 1.10

Fixed¶

• Device was sometimes not receiving quickly enough during broadcast.

3.1.0 - 2023-12-14¶

• MT protocol version: 1.9

Added¶

• Support for firmware broadcast

• Establishing connections faster

• Added property:

  • 0x8303 - Start Upstream Throughput Test

Changed¶

• Reduced button press time to wake up the device from SYSTEM_OFF mode

• Firmware download improvements

• Upstream queue improvements

Fixed¶

• Fixed bug that could cause the device to brick under certain conditions when aborting firmware upgrade.

• Flash data storage issue

3.0.0 - 2023-02-10¶

• Mt protocol version: 1.7

Added¶

• Added property:

  • 83.05 - Throughput Test Packet Counter

• SYSTEM_OFF mode while sleeping in storage mode

• Extended route address support

Changed¶

• Firmware download improvements

• Updated offer selection algorithm

• Updated reporting of motion property:

  • Unconnected mode:

    • Advertise 5x on change.

    • Advertise 5x one minute later.

  • In Connected mode:

    • Report motion on change (MT message priority level 3 - Medium)

  • Report motion together with other properties on periodic update (20 min)

• Measurement reporting interval is now 600s (from 60s)

• Include variant when reporting in storage mode

Fixed¶

• Connection and latency improvements

Removed¶

• Flags byte extension removed from motion (0x8810) property

• Logic to set PWM pin output high for sensitivity level 255/0xFF. Instead, set it to the regular PWM duty cycle value.

2.0.1 - 2022-11-07¶

• Mt protocol version: 1.5.

Fixed¶

• Transition flag in motion 0x8810 stuck at 1 on periodic advertisements

2.0.0 - 2022-11-04¶

• Mt protocol version: 1.5

Added¶

• Added properties:

  • 0x8260 - Temperature Measurement Reporting

  • 0x8262 - Humidity Measurement Reporting

  • 0x8263 - Light Intensity Measurement Reporting

  • 0x9021 - Offer collection period

• Firmware update timeout will only apply during download. If the firmware image is downloaded within given timeout, the timeout will be set to zero and the device will wait for a new image to apply.

• Support to read temperature from NRF chip if there is no external sensor mount

• Logic to start offer advertisement on button press if the device is in pause (sleep) state. And if the device is in an active state, restart the offer advertisement.

• Add transition counter and flag extension to property 0x8810.

Changed¶

• Advertisement interval from 100ms to 1100ms.

• Latency set to the same as MultitTacker (0x0005)

• Report reset cause (0x8102) with the first set bit found in RESETREAS register

• Increase preferred parent connection timeout from 30s to 60s.

• Updated offer selection algorithm

Fixed¶

• Device was advertising with 1-second interval in place of 100ms interval on disconnection in temporarily connected mode.

• Reading property 0x9100 - Uplink RSSI value returned 0.

1.3.0 - 2022-02-15¶

• MT protocol version: 1.2

Added¶

• Do not measure light when any or both LED(s) ON.

• Added property and event:

  • 0x81.02 - Reset cause as event. This will be reported once at the start-up of the device.

• Advertise heartbeat (0xD048) 30 times at a 1-second interval on button press in unconnected mode

Changed¶

• I2C pin configuration set to input with pull-up when TWI is uninitialized.

• Restart 5-minute timer on every button press.

• LED indication for every button press when the device is in storage mode.

• Changed light measurement timeout from 3 to 60 seconds in test mode.

• Advertise heartbeat (0xD048) 10 times at 3-second intervals in unconnected mode and report once in connected mode.

Fixed¶

• Light measurement was taking 5ms more than expected.

• PIR sensor sensitivity level was not measured at power on.

Removed¶

• D4 error message support.

• Removed 1-second measurement delay used before triggering the light measurement and PIR sensor sensitivity level measurement.

1.2.0 - 2021-11-03¶

• MT Protocol Version: 1.1

Fixed¶

• Property value stuck issue (issue #15).

• PIR sensor sensitivity default value was not set to 60.

1.1.0 - 2021-10-28¶

• MT Protocol Version: 1.1

Changed¶

• Total minutes in motion logic same as per Multitracker.

• Added logic to abort ongoing ADC measurement after 2 seconds if it was not completed in time.

• Change ADC Acquisition time to 15uS for PIR and light sensor.

• Removed property support of 0x8151

Fixed¶

• Light measurement was not updated when PIR sensor sensitivity level set to 0 or FF.

1.0.0 - 2021-10-15¶

• MT Protocol Version: 1.1

Added¶

• Added property:

  • 0x8151 - To enable/disable PIR sensor ADC measurement.

• Trigger light measurement at 0x8803 request.

• Measure PIR sensor sensitivity level millivolt on request.

Changed¶

• Change PWM duty cycle as per PIR sensor sensitivity level set using property 0x8150

• PIR sensor sensitivity level range 0 to 255, default 5.

• Changed PWM frequency to 10Hz.

• PIR sensor sensitivity level measurement logic as per issue #8.

• Light measurement and reporting as per issue #5 and #6.

• Changed slave latency to 8

• Changed ADC reference to VDD/4 for sensor measurements.

• Changed LF clock frequency accuracy to 100 ppm

• Stop reporting motion event when battery level found 0% at 2.2V (issue #4).

• Battery measurement logic as per MT11x

• Report light measurement at 3 seconds in test mode.

Fixed¶

• LED floating pins to high state at initialization

• Hight current consumption at power on

• Timing issue of light sensor VDD