logger: prefix system-log lines with date/time (or uptime)#183
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Add a per-line timestamp to the System log ring buffer. Once the clock is set (SNTP sync or manual), lines are prefixed with local "YYYY-MM-DD HH:MM:SS "; before that, an uptime "[ssss.mmm] " is used so we never emit a misleading 1970 wall-clock. esp_log's own "(<ts>)" token is stripped at line starts to avoid double-timestamping, and the prefix is only applied at line starts since one log line can arrive as several fragments. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Add a per-line timestamp to the System log ring buffer. Once the clock is set (SNTP sync or manual), lines are prefixed with local "YYYY-MM-DD HH:MM:SS "; before that, an uptime "[ssss.mmm] " is used so we never emit a misleading 1970 wall-clock. esp_log's own "()" token is stripped at line starts to avoid double-timestamping, and the prefix is only applied at line starts since one log line can arrive as several fragments.
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