reachableChanged(true) never fires within the nymea setup timeout when
the RTU link is slow (e.g. 433 MHz radio relay). Add a fallback:
trigger initialize() immediately if master is already connected
(QTimer::singleShot 500 ms), and also on master::connectedChanged.
The existing reachableChanged path is kept for TCP-style RTU adapters.
Bump to 1.15.0+etm5.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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