habe nun einen zweiten Raspberry (Zero W) als Slave eingebunden.
Alles nach Anleitung und hat soweit geklappt.

Bekomme nun allerdings ständig die Fehlermeldungen:

host.Cam1	2020-06-13 15:29:46.126	error	Multihost discovery server: error: Error: bind EADDRINUSE 0.0.0.0:50005 at state.handle.lookup (dgram.js:242:18) at process._tickCallback (internal/process/next_tick.js:63:19)
host.Cam1	2020-06-13 15:29:41.116	error	at process._tickCallback (internal/process/next_tick.js:63:19)
host.Cam1	2020-06-13 15:29:41.116	error	at state.handle.lookup (dgram.js:242:18)
host.Cam1	2020-06-13 15:29:41.116	error	Multihost discovery server: error: Error: bind EADDRINUSE 0.0.0.0:50005
host.Cam1	2020-06-13 15:29:36.106	error	at process._tickCallback (internal/process/next_tick.js:63:19)
host.Cam1	2020-06-13 15:29:36.106	error	at state.handle.lookup (dgram.js:242:18)
host.Cam1	2020-06-13 15:29:36.106	error	Multihost discovery server: error: Error: bind EADDRINUSE 0.0.0.0:50005
host.Cam1	2020-06-13 15:29:31.086	error	at process._tickCallback (internal/process/next_tick.js:63:19)
host.Cam1	2020-06-13 15:29:31.086	error	at state.handle.lookup (dgram.js:242:18)
host.Cam1	2020-06-13 15:29:31.086	error	Multihost discovery server: error: Error: bind EADDRINUSE 0.0.0.0:50005
host.Cam1	2020-06-13 15:29:26.048	error	at process._tickCallback (internal/process/next_tick.js:63:19)
host.Cam1	2020-06-13 15:29:26.048	error	at state.handle.lookup (dgram.js:242:18)
host.Cam1	2020-06-13 15:29:26.048	error	Multihost discovery server: error: Error: bind EADDRINUSE 0.0.0.0:50005
host.Cam1	2020-06-13 15:29:25.393	info	Do not restart adapter system.adapter.rpi2.1 because desired by instance
host.Cam1	2020-06-13 15:29:25.352	error	instance system.adapter.rpi2.1 terminated by request of the instance itself and will not be restarted, before user restarts it.

Auf dem Slave ist nebenbei noch MotionEye installiert. Möchte mit dem iOBroke die Gpio ansteuern und damit die Infrarotlampen schalten.
Bisher habe ich nur rausgefunden, dass man nach doppelten Diensten schauen soll, kein erfolg.

Dienste Host:

  PID TTY          TIME CMD
    1 ?        00:00:03 systemd
    2 ?        00:00:00 kthreadd
    3 ?        00:00:00 rcu_gp
    4 ?        00:00:00 rcu_par_gp
    8 ?        00:00:00 mm_percpu_wq
    9 ?        00:00:01 ksoftirqd/0
   10 ?        00:00:05 rcu_sched
   11 ?        00:00:00 rcu_bh
   12 ?        00:00:00 migration/0
   13 ?        00:00:00 cpuhp/0
   14 ?        00:00:00 cpuhp/1
   15 ?        00:00:00 migration/1
   16 ?        00:00:00 ksoftirqd/1
   19 ?        00:00:00 cpuhp/2
   20 ?        00:00:00 migration/2
   21 ?        00:00:00 ksoftirqd/2
   24 ?        00:00:00 cpuhp/3
   25 ?        00:00:00 migration/3
   26 ?        00:00:00 ksoftirqd/3
   29 ?        00:00:00 kdevtmpfs
   30 ?        00:00:00 netns
   32 ?        00:00:00 kworker/1:1-mm_percpu_wq
   34 ?        00:00:00 khungtaskd
   35 ?        00:00:00 oom_reaper
   36 ?        00:00:00 writeback
   37 ?        00:00:00 kcompactd0
   38 ?        00:00:00 crypto
   39 ?        00:00:00 kblockd
   41 ?        00:00:00 watchdogd
   42 ?        00:00:00 rpciod
   43 ?        00:00:00 kworker/u9:0-hci0
   44 ?        00:00:00 xprtiod
   45 ?        00:00:00 kworker/u8:1-events_unbound
   47 ?        00:00:00 kswapd0
   48 ?        00:00:00 nfsiod
   59 ?        00:00:00 kthrotld
   60 ?        00:00:00 iscsi_eh
   62 ?        00:00:00 dwc_otg
   64 ?        00:00:00 DWC Notificatio
   65 ?        00:00:00 vchiq-slot/0
   66 ?        00:00:00 vchiq-recy/0
   67 ?        00:00:00 vchiq-sync/0
   68 ?        00:00:00 vchiq-keep/0
   69 ?        00:00:00 SMIO
   71 ?        00:00:00 irq/39-brcmstb_
   72 ?        00:00:00 irq/40-mmc1
   74 ?        00:00:00 irq/40-mmc0
   75 ?        00:00:00 mmc_complete
   76 ?        00:00:00 kworker/0:1H-mmc_complete
   77 ?        00:00:00 jbd2/mmcblk0p2-
   78 ?        00:00:00 ext4-rsv-conver
   80 ?        00:00:00 kworker/3:1H-kblockd
   82 ?        00:00:00 ipv6_addrconf
   97 ?        00:00:00 kworker/1:1H-kblockd
   98 ?        00:00:00 kworker/2:2H-kblockd
  103 ?        00:00:00 systemd-journal
  144 ?        00:00:00 systemd-udevd
  192 ?        00:00:00 SMIO
  223 ?        00:00:00 mmal-vchiq
  224 ?        00:00:00 mmal-vchiq
  225 ?        00:00:00 mmal-vchiq
  234 ?        00:00:00 v3d_bin
  235 ?        00:00:00 cfg80211
  237 ?        00:00:00 v3d_render
  238 ?        00:00:00 v3d_tfu
  239 ?        00:00:00 v3d_csd
  240 ?        00:00:00 v3d_cache_clean
  242 ?        00:00:00 brcmf_wq/mmc1:0
  243 ?        00:00:00 brcmf_wdog/mmc1
  264 ?        00:00:00 kworker/u8:3-events_unbound
  290 ?        00:00:00 systemd-timesyn
  326 ?        00:00:00 udisksd
  327 ?        00:00:00 alsactl
  328 ?        00:00:00 cron
  332 ?        00:00:16 deCONZ-WIFI2.sh
  336 ?        00:00:00 systemd-logind
  342 ?        00:00:00 rsyslogd
  345 ?        00:00:00 avahi-daemon
  349 ?        00:01:20 deCONZ
  350 ?        00:00:05 deCONZ-update2.
  375 ?        00:00:00 dbus-daemon
  389 ?        00:00:00 wpa_supplicant
  390 ?        00:00:00 rngd
  391 ?        00:00:00 thd
  418 ?        00:00:00 avahi-daemon
  443 ?        00:00:00 dhcpcd
  496 ?        00:00:00 polkitd
  508 ?        00:00:00 wpa_supplicant
  513 ?        00:00:00 sshd
  514 ?        00:00:00 xrdp-sesman
  525 ?        00:01:17 redis-server
  538 tty1     00:00:00 login
  546 ?        00:00:00 xrdp
  604 ?        00:00:00 systemd
  607 ?        00:00:00 (sd-pam)
  616 ?        00:00:02 io.text2command
  624 tty1     00:00:00 bash
  629 ?        00:00:00 kworker/u9:1-hci0
  630 ?        00:00:00 hciattach
  633 ?        00:00:00 bluetoothd
  648 ?        00:00:00 bluealsa
  655 ?        00:00:00 krfcommd
  673 ?        00:00:53 io.shelly.0
  734 ?        00:00:09 io.web.0
  862 ?        00:00:04 io.fullybrowser
  943 ?        00:00:04 io.history.0
  983 ?        00:00:03 io.yeelight-2.0
 1022 ?        00:00:05 io.backitup.0
 1090 ?        00:00:07 io.mihome-vacuu
 1131 ?        00:00:06 io.alexa2.0
 1200 ?        00:00:04 io.deconz.0
 1246 ?        00:00:04 io.fritzdect.0
 1395 ?        00:00:02 io.simple-api.0
 3964 ?        00:00:00 kworker/2:2-events
 3984 ?        00:00:00 kworker/0:1-events_freezable
 5230 ?        00:00:00 kworker/2:0H
 5231 ?        00:00:00 kworker/3:0H
 6032 ?        00:00:00 kworker/0:2H
 7213 ?        00:00:00 kworker/1:2H
 7993 ?        00:00:00 kworker/0:0-events
 8921 ?        00:00:00 kworker/2:1H
 9738 ?        00:00:00 sleep
 9792 ?        00:00:00 ping
 9798 ?        00:00:00 sleep
 9799 pts/0    00:00:00 ps
12303 ?        00:00:00 kworker/3:0-events
16983 ?        00:00:00 kworker/1:0
23049 ?        00:00:00 kworker/3:1-mm_percpu_wq
28930 ?        00:00:00 sshd
28995 ?        00:00:00 sshd
28998 pts/0    00:00:00 bash
31087 ?        00:00:00 kworker/2:0-events
32259 ?        00:00:32 iobroker.js-con
32295 ?        00:00:00 kworker/0:2-events
32296 ?        00:00:10 io.admin.0
32330 ?        00:00:04 io.info.0
32410 ?        00:00:22 io.javascript.0
32530 ?        00:00:00 kworker/1:0H
32626 ?        00:00:05 io.ping.0

Dienste Slave:

pi@Cam1:~ $ ps -e
  PID TTY          TIME CMD
    1 ?        00:00:06 systemd
    2 ?        00:00:00 kthreadd
    6 ?        00:00:00 mm_percpu_wq
    7 ?        00:00:00 ksoftirqd/0
    8 ?        00:00:00 kdevtmpfs
    9 ?        00:00:00 netns
   11 ?        00:00:00 khungtaskd
   12 ?        00:00:00 oom_reaper
   13 ?        00:00:00 writeback
   14 ?        00:00:00 kcompactd0
   15 ?        00:00:00 crypto
   16 ?        00:00:00 kblockd
   17 ?        00:00:00 watchdogd
   18 ?        00:00:00 rpciod
   19 ?        00:00:00 kworker/u3:0-hci0
   20 ?        00:00:00 xprtiod
   23 ?        00:00:00 kswapd0
   24 ?        00:00:00 nfsiod
   35 ?        00:00:00 kthrotld
   36 ?        00:00:00 iscsi_eh
   37 ?        00:00:00 dwc_otg
   38 ?        00:00:00 DWC Notificatio
   39 ?        00:00:00 vchiq-slot/0
   40 ?        00:00:00 vchiq-recy/0
   41 ?        00:00:00 vchiq-sync/0
   42 ?        00:00:00 vchiq-keep/0
   43 ?        00:00:00 SMIO
   44 ?        00:00:03 irq/86-mmc1
   45 ?        00:00:01 kworker/0:2-events
   47 ?        00:00:00 mmc_complete
   48 ?        00:00:01 kworker/0:1H-mmc_complete
   50 ?        00:00:00 jbd2/mmcblk0p2-
   51 ?        00:00:00 ext4-rsv-conver
   52 ?        00:00:00 ipv6_addrconf
   83 ?        00:00:01 systemd-journal
  106 ?        00:00:04 kworker/u2:2-events_unbound
  108 ?        00:00:00 systemd-udevd
  119 ?        00:00:00 SMIO
  130 ?        00:00:00 mmal-vchiq
  133 ?        00:00:00 mmal-vchiq
  140 ?        00:00:00 mmal-vchiq
  141 ?        00:00:00 mmal-vchiq
  142 ?        00:00:00 mmal-vchiq
  160 ?        00:00:00 cfg80211
  164 ?        00:00:00 brcmf_wq/mmc1:0
  165 ?        00:00:00 brcmf_wdog/mmc1
  191 ?        00:00:00 systemd-timesyn
  240 ?        00:00:15 meyectl
  244 ?        00:00:00 dbus-daemon
  251 ?        00:00:00 thd
  255 ?        00:00:00 rsyslogd
  259 ?        00:00:00 wpa_supplicant
  267 ?        00:00:00 cron
  282 ?        00:00:00 systemd-logind
  286 ?        00:00:00 alsactl
  289 ?        00:00:00 avahi-daemon
  292 ?        00:00:00 rngd
  297 ?        00:00:00 avahi-daemon
  338 ?        00:00:00 wpa_supplicant
  359 ?        00:00:00 hciattach
  360 ?        00:00:00 kworker/u3:2-hci0
  362 ?        00:00:00 bluetoothd
  424 ?        00:00:00 dhcpcd
  425 ?        00:00:50 iobroker.js-con
  434 tty1     00:00:00 agetty
  435 ?        00:00:00 sshd
  447 ?        00:00:00 meyectl
  501 ?        00:00:00 sshd
  531 ?        00:00:00 systemd
  534 ?        00:00:00 (sd-pam)
  548 ?        00:00:00 sshd
  551 pts/0    00:00:00 bash
  917 ?        00:00:03 kworker/u2:0-brcmf_wq/mmc1:0001:1
 1165 ?        00:00:00 kworker/0:0-events_power_efficient
 1304 ?        00:00:00 kworker/0:0H
 1416 ?        00:00:23 motion
 1466 ?        00:00:32 iobroker.js-con
 1558 ?        00:00:36 io.rpi2.1
 1762 ?        00:00:00 kworker/0:1-events_freezable
 1787 ?        00:00:00 kworker/u2:1-events_unbound
 1788 pts/0    00:00:00 ps