Hmm, dann ist die Callback Adresse also nicht die Lösung meines Problems…
D.h. es läuft leider weiter so: 
hm-rega.0 2018-04-07 18:46:10.431 info renamed hm-rpc.1.CUX2803002 to "PINGER"
hm-rega.0 2018-04-07 18:46:10.415 info renamed hm-rpc.1.CUX2803002.0 to "PINGER:0"
hm-rega.0 2018-04-07 18:46:10.407 info renamed hm-rpc.1.CUX2803002.1 to "PING_K1"
hm-rega.0 2018-04-07 18:46:10.397 info renamed hm-rpc.1.CUX2803002.2 to "PING_K2"
hm-rega.0 2018-04-07 18:46:10.388 info renamed hm-rpc.1.CUX2803002.3 to "PING_R1"
hm-rega.0 2018-04-07 18:46:10.380 info renamed hm-rpc.1.CUX2803002.4 to "PING_R2"
hm-rega.0 2018-04-07 18:46:10.370 info renamed hm-rpc.1.CUX2803002.5 to "PING_P1"
hm-rega.0 2018-04-07 18:46:10.361 info renamed hm-rpc.1.CUX2803002.6 to "PINGER:6"
hm-rega.0 2018-04-07 18:46:10.353 info renamed hm-rpc.1.CUX2803002.7 to "PINGER:7"
hm-rega.0 2018-04-07 18:46:10.344 info renamed hm-rpc.1.CUX2803002.8 to "PINGER:8"
hm-rega.0 2018-04-07 18:46:10.335 info renamed hm-rpc.1.CUX2803002.9 to "PINGER:9"
hm-rega.0 2018-04-07 18:46:10.327 info renamed hm-rpc.1.CUX2803002.10 to "PINGER:10"
hm-rega.0 2018-04-07 18:46:10.315 info renamed hm-rpc.1.CUX2803002.11 to "PINGER:11"
hm-rega.0 2018-04-07 18:46:10.307 info renamed hm-rpc.1.CUX2803002.12 to "PINGER:12"
hm-rega.0 2018-04-07 18:46:10.298 info renamed hm-rpc.1.CUX2803002.13 to "PINGER:13"
hm-rega.0 2018-04-07 18:46:10.284 info renamed hm-rpc.1.CUX2803002.14 to "PINGER:14"
hm-rega.0 2018-04-07 18:46:10.269 info renamed hm-rpc.1.CUX2803002.15 to "PINGER:15"
hm-rega.0 2018-04-07 18:46:10.254 info renamed hm-rpc.1.CUX2803002.16 to "PINGER:16"
hm-rpc.1 2018-04-07 18:46:08.160 info new CUxD devices/channels after filter: 0
hm-rpc.1 2018-04-07 18:46:08.121 info xmlrpc -> listDevices 0
hm-rega.0 2018-04-07 18:42:40.259 info renamed hm-rpc.1.CUX2803002 to "PINGER"
hm-rega.0 2018-04-07 18:42:40.243 info renamed hm-rpc.1.CUX2803002.0 to "PINGER:0"
hm-rega.0 2018-04-07 18:42:40.233 info renamed hm-rpc.1.CUX2803002.1 to "PING_K1"
hm-rega.0 2018-04-07 18:42:40.223 info renamed hm-rpc.1.CUX2803002.2 to "PING_K2"
hm-rega.0 2018-04-07 18:42:40.213 info renamed hm-rpc.1.CUX2803002.3 to "PING_R1"
hm-rega.0 2018-04-07 18:42:40.203 info renamed hm-rpc.1.CUX2803002.4 to "PING_R2"
hm-rega.0 2018-04-07 18:42:40.194 info renamed hm-rpc.1.CUX2803002.5 to "PING_P1"
hm-rega.0 2018-04-07 18:42:40.185 info renamed hm-rpc.1.CUX2803002.6 to "PINGER:6"
hm-rega.0 2018-04-07 18:42:40.177 info renamed hm-rpc.1.CUX2803002.7 to "PINGER:7"
hm-rega.0 2018-04-07 18:42:40.167 info renamed hm-rpc.1.CUX2803002.8 to "PINGER:8"
hm-rega.0 2018-04-07 18:42:40.158 info renamed hm-rpc.1.CUX2803002.9 to "PINGER:9"
hm-rega.0 2018-04-07 18:42:40.149 info renamed hm-rpc.1.CUX2803002.10 to "PINGER:10"
hm-rega.0 2018-04-07 18:42:40.135 info renamed hm-rpc.1.CUX2803002.11 to "PINGER:11"
hm-rega.0 2018-04-07 18:42:40.124 info renamed hm-rpc.1.CUX2803002.12 to "PINGER:12"
hm-rega.0 2018-04-07 18:42:40.114 info renamed hm-rpc.1.CUX2803002.13 to "PINGER:13"
hm-rega.0 2018-04-07 18:42:40.103 info renamed hm-rpc.1.CUX2803002.14 to "PINGER:14"
hm-rega.0 2018-04-07 18:42:40.095 info renamed hm-rpc.1.CUX2803002.15 to "PINGER:15"
hm-rega.0 2018-04-07 18:42:40.085 info renamed hm-rpc.1.CUX2803002.16 to "PINGER:16"
hm-rpc.1 2018-04-07 18:42:38.054 info new CUxD devices/channels after filter: 0
hm-rpc.1 2018-04-07 18:42:37.564 info xmlrpc -> listDevices 0
hm-rega.0 2018-04-07 18:39:09.873 info renamed hm-rpc.1.CUX2803002 to "PINGER"
hm-rega.0 2018-04-07 18:39:09.865 info renamed hm-rpc.1.CUX2803002.0 to "PINGER:0"
hm-rega.0 2018-04-07 18:39:09.857 info renamed hm-rpc.1.CUX2803002.1 to "PING_K1"
hm-rega.0 2018-04-07 18:39:09.849 info renamed hm-rpc.1.CUX2803002.2 to "PING_K2"
hm-rega.0 2018-04-07 18:39:09.842 info renamed hm-rpc.1.CUX2803002.3 to "PING_R1"
hm-rega.0 2018-04-07 18:39:09.831 info renamed hm-rpc.1.CUX2803002.4 to "PING_R2"
hm-rega.0 2018-04-07 18:39:09.823 info renamed hm-rpc.1.CUX2803002.5 to "PING_P1"
hm-rega.0 2018-04-07 18:39:09.814 info renamed hm-rpc.1.CUX2803002.6 to "PINGER:6"
hm-rega.0 2018-04-07 18:39:09.805 info renamed hm-rpc.1.CUX2803002.7 to "PINGER:7"
hm-rega.0 2018-04-07 18:39:09.794 info renamed hm-rpc.1.CUX2803002.8 to "PINGER:8"
hm-rega.0 2018-04-07 18:39:09.738 info renamed hm-rpc.1.CUX2803002.9 to "PINGER:9"
hm-rega.0 2018-04-07 18:39:09.727 info renamed hm-rpc.1.CUX2803002.10 to "PINGER:10"
hm-rega.0 2018-04-07 18:39:09.708 info renamed hm-rpc.1.CUX2803002.11 to "PINGER:11"
hm-rega.0 2018-04-07 18:39:09.698 info renamed hm-rpc.1.CUX2803002.12 to "PINGER:12"
hm-rega.0 2018-04-07 18:39:09.678 info renamed hm-rpc.1.CUX2803002.13 to "PINGER:13"
hm-rega.0 2018-04-07 18:39:09.669 info renamed hm-rpc.1.CUX2803002.14 to "PINGER:14"
hm-rega.0 2018-04-07 18:39:09.651 info renamed hm-rpc.1.CUX2803002.15 to "PINGER:15"
hm-rega.0 2018-04-07 18:39:09.640 info renamed hm-rpc.1.CUX2803002.16 to "PINGER:16"
hm-rpc.1 2018-04-07 18:39:07.487 info new CUxD devices/channels after filter: 0
hm-rpc.1 2018-04-07 18:39:07.428 info xmlrpc -> listDevices 0
Aber abgesehen davon läuft iobroker jetzt wirklich sehr stabil bei mir.
Danke!