No rrd4j persistence items available via REST access (and in HABdroid)

Setup, Configuration and Use Runtime
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local network, via REST interface … linux machine

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just replaced addons.cfg, with the newst one and configured rrd4j for default persistence service instead of configuring with Paper UI, now it works …

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and reboot

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That sounds to me as if you haven’t used the link WITH the serviceId. Without setting rrd4j as default REST wouldn’t know which persistence service to call.
But that is guessing from my side, for you it works, that is what matters.
[Edit]
“error”: {
“message”: “Persistence service not found: null”,
“http-code”: 400
Me wrong, the above error would be returned if rrd4j would not be default and the serviceId would not be included in the the call.