could this be the problem (timeout/disconnection). Attached is a part of the Mosquitto.log:
1539084831: Client JaroliftDongle-0003f43d has exceeded timeout, disconnecting.
1539084831: New connection from 192.168.178.35 on port 1883.
1539084831: New client connected from 192.168.178.35 as JaroliftDongle-0003f43d (c1, k15, u).
1539084831: Sending CONNACK to JaroliftDongle-0003f43d (0)
1539084831: Received SUBSCRIBE from JaroliftDongle-0003f43d
1539084831: cmd/jarolift/# (QoS 0)
1539084831: JaroliftDongle-0003f43d 0 cmd/jarolift/#
1539084831: Sending SUBACK to JaroliftDongle-0003f43d
1539084831: Sending PUBLISH to JaroliftDongle-0003f43d (d0, q0, r1, m0, 'cmd/jarolift/shutter/0', ... (1 bytes))
1539084831: Sending PUBLISH to JaroliftDongle-0003f43d (d0, q0, r1, m0, 'cmd/jarolift/shutter/1', ... (1 bytes))
1539084831: Sending PUBLISH to JaroliftDongle-0003f43d (d0, q0, r1, m0, 'cmd/jarolift/shutter/2', ... (1 bytes))
1539084831: Sending PUBLISH to JaroliftDongle-0003f43d (d0, q0, r1, m0, 'cmd/jarolift/shutter/3', ... (1 bytes))
1539084831: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r1, m0, 'tele/jarolift/LWT', ... (6 bytes))
1539084832: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r0, m0, 'stat/jarolift/shutter/0', ... (1 bytes))
1539084832: Sending PUBLISH to OpenHAB2 (d0, q0, r0, m0, 'stat/jarolift/shutter/0', ... (1 bytes))
1539084832: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r1, m0, 'stat/jarolift/devicecounter', ... (4 bytes))
1539084832: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r0, m0, 'stat/jarolift/shutter/1', ... (1 bytes))
1539084832: Sending PUBLISH to OpenHAB2 (d0, q0, r0, m0, 'stat/jarolift/shutter/1', ... (1 bytes))
1539084832: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r1, m0, 'stat/jarolift/devicecounter', ... (4 bytes))
1539084833: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r0, m0, 'stat/jarolift/shutter/2', ... (1 bytes))
1539084833: Sending PUBLISH to OpenHAB2 (d0, q0, r0, m0, 'stat/jarolift/shutter/2', ... (1 bytes))
1539084833: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r1, m0, 'stat/jarolift/devicecounter', ... (4 bytes))
1539084834: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r0, m0, 'stat/jarolift/shutter/3', ... (1 bytes))
1539084834: Sending PUBLISH to OpenHAB2 (d0, q0, r0, m0, 'stat/jarolift/shutter/3', ... (1 bytes))
1539084834: Received PUBLISH from JaroliftDongle-0003f43d (d0, q0, r1, m0, 'stat/jarolift/devicecounter', ... (4 bytes))
1539084849: Received PINGREQ from JaroliftDongle-0003f43d
1539084849: Sending PINGRESP to JaroliftDongle-0003f43d
1539084863: Received PINGREQ from JaroliftDongle-0003f43d