Real-time Clock (clock)

STICKER maintains accurate wall-clock time via an internal Real-Time Clock (RTC). Wall-clock time is required for precise timestamping of Sensor History log records, Alarm Rules event triggers, and network status messages.

Firmware v1.4.0

The Real-time Clock (RTC) capabilities described on this page are a core feature of STICKER firmware v1.4.0 and are not available in v1.3.x.

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Time Synchronization Mechanisms

The RTC can be synchronized through three independent methods:

1. LoRaWAN Network Sync (DeviceTimeReq):

   • The device automatically requests network time using the standard LoRaWAN MAC command DeviceTimeReq upon joining the network.
   • Periodic re-synchronization is performed to correct clock drift during long-term field deployment.

2. Encrypted NFC Local Sync:

   • When configured using the HARDWARIO Manager app on a smartphone, the phone's system time can automatically update and set the STICKER RTC over NFC.

3. Remote & Shell Commands:

   • Time can be queried or manually updated using developer shell commands or remotely via LoRaWAN downlink commands on fPort 85.

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Developer Shell Commands (clock)

Developer shell commands allow inspecting and managing the RTC directly (see Firmware Setup for opening the console):

Command	Description
clock get	Read and print the current UTC wall-clock time and Unix timestamp.
clock set <unix>	Manually set the RTC using a 32-bit Unix epoch timestamp (seconds since Jan 1, 1970).
clock sync	Force an immediate LoRaWAN DeviceTimeReq MAC command to request network time synchronization.