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KKM B5 0051


KKM B5 0051 is a 3rd party hardware from KKM Smart Solutions. It has user replaceable AAA alkaline battery x2. Will last up to 5 years with default settings in connected mode. Programmed from factory with Meshtech firmware to work seamlessly and integrate fully in a Meshtech system. It has a push button and pull cord for input and LED/sound indication to provide feedback.

The Bluetooth chipset is nRF52832 from Nordic Semiconductor.

  • Firmware Model Number: 0x0051 (81)
  • DFU Type: BLE SMP

Normal operation procedure

Similar to all Meshtech devices KKM B5 0051 is delivered in storage mode. This is to conserve power and avoid BLE advertising during transport. Normal operation device-mode for this device is connected. Pressing button for 1s will make device discoverable by advertising BLE storage mode advertisements, and device can be switched to connected mode by command via system/gateway. If no command to switch device mode is received while being in this state, device will go back to sleep and stop advertisements.

In connected mode device will attempt to join nearby Meshtech system, directly to a gateway or trough a network of extenders. Alarm is activated by pressing SOS button or pull cord. LED will continue to blink periodically as long as alarm is active. Alarm state can be confirmed/cleared from system, and device will stop blinking LED to show that alarm has been cleared.

Service Mode

Service Mode can be used to perform DFU upgrades and/or factory reset of a device when provisioning information (i.e. network key) is unknown/lost. To enter Service Mode, button need to be pressed while powering on device; in this device's case - while inserting the battery. Device being in Service Mode is indicated by LED blinking rapidly. Device is discoverable by "SM" device name while in Service Mode. It runs BLE SMP and can be connected to and upgraded. To perform factory reset, press button continuously for more than 5 seconds while device is in Service Mode. LED will light constant while button is held, and should be held until LED turn off (5s) to perform factory reset. If no connection is established or no factory reset command is received, device will reboot and start in previous mode after 2 minute timeout. Timeout is extended while BLE connection is established and for additional 2 minutes after disconnect.


Property Reported Default Value From Version
0x8000 - Model Number Yes 0x0051 (81)
0x8001 - Firmware Version Yes -
0x8002 - Hardware Version Yes -
0x8003 - MAC Address No -
0x8005 - Production Info Extended No -
0x8007 - Variant Yes 0x04
0x8020 - Power Source Yes 0x02 (2)
0x8100 - Battery Level Yes -
0x8101 - Uptime Yes 0x00000000
0x8102 - Reset Cause Yes -
0x8110 - Device Mode Yes 0x03 (storage)
0x8120 - Firmware Update State Yes 0xFF (255)
0x8121 - Start Firmware Update - -
0x8122 - Firmware Update Control - -
0x8300 - Soft Reset - -
0x8301 - Factory Reset - -
0x8302 - Request Property Reporting - -
0x8305 - Throughput Test Packet Counter No 0x00000000
0x9002 - Network Lock Yes 0x00
0x9006 - Preferred Parent Yes 0x000000000000
0x9021 - Offer Collection Period Yes 0x000A0064 (10, 100)
0x9100 - Uplink RSSI Yes -
0x9800 - Alarm State / SOS Yes 0x00 (0)


Event Version
0x8102 - Reset Cause