ske087 b4db41a400 Fix offline board flooding: fail-fast probe in hardware driver poll()
All three hardware drivers (Olimex, generic_esp32, generic_esp8266) now
probe with the first request and bail immediately on failure.

Before: offline board with 4 relays + 3 inputs = 7 requests × 3 s timeout
        = up to 21 s of blocking + 7 log lines per recheck cycle.
After:  exactly 1 request × 3 s timeout regardless of I/O count.
2026-02-27 16:20:10 +02:00
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