Makes the demo read-write happen more similar to how JMRI reads stuff from the nodes.
Specifically, makes the read happen a bit later and arrive on the swing thread.
Coverage increased (+0.02%) to 70.996% when pulling 61f12c0026c76271675fc34258ff30947e58b0b4 on bracz-update-demo-readwrite into 50b2268165e56902b61fd39b22a0fe402d95976b on master.
Makes the demo read-write happen more similar to how JMRI reads stuff from the nodes. Specifically, makes the read happen a bit later and arrive on the swing thread.