GET /api/debug/system/

General system diagnostics: RTC clocking, reset reason, and subsystem status.

Auth: Bearer (powerUser).

---

Response 200

{
  "core": "ARM32",
  "uptimeSec": 86421,
  "cpuFreqMHz": 168,
  "resetReason": "Power on",
  "rtcSource": "LSE",
  "rtcTime": "2026-07-09T12:34:56Z",
  "rtcSync": "NTP",
  "readyFlags": {
    "settings": true,
    "calibration": true,
    "rtc": true,
    "button": true,
    "led": true,
    "lcd": true,
    "extmem": true,
    "identity": true,
    "logger": true,
    "temprec": true,
    "temphistory": true,
    "msr": true,
    "random": true,
    "eth": true,
    "lwip": true,
    "httpd": true,
    "sntp": false,
    "wireguard": false,
    "modbus": true
  }
}

Response fields

Field	Type	Description
core	string	Core architecture: "ARM32"
uptimeSec	number	Uptime since power-on (seconds)
cpuFreqMHz	number	Core frequency (SystemCoreClock / 1000000)
resetReason	string	Reason for the most recent reset
rtcSource	string	RTC clock source: "LSE", "LSI", or "UNKNOWN"
rtcTime	string	Current RTC time in UTC (UTC+0)
rtcSync	string	Source that most recently set the RTC time: "NONE", "BACKUP", "NTP", or "MANUAL"
readyFlags	object	Boolean subsystem initialization flags

resetReason values

Value	RCC_CSR flag	Description
"Power on"	RCC_CSR_PORRSTF	Power-on reset
"Reset pin"	RCC_CSR_PADRSTF	External reset (RESET button)
"Watchdog"	RCC_CSR_WDGRSTF	Watchdog reset
"Software"	RCC_CSR_SFTRSTF	Software reset (NVIC_SystemReset())
"Low power"	RCC_CSR_LPWRRSTF	Low-power reset
"Unknown"	—	Unknown

rtcSource values

• "LSE" — external 32.768 kHz crystal (accurate).
• "LSI" — internal RC oscillator (±5% drift).
• "UNKNOWN" — source not determined.

rtcSync values

• "NONE" — the RTC started with the default time; no synchronization or restoration occurred.
• "BACKUP" — time restored from the backup domain at startup.
• "NTP" — time set by SNTP/NTP synchronization.
• "MANUAL" — time set manually through the UI, API, or Modbus.

readyFlags fields

settings, calibration, rtc, button, led, lcd, extmem, identity, logger, temprec, temphistory, msr, random, eth, lwip, httpd, sntp, wireguard, modbus