ok this error disappeared. But the driver still crash- nothing in the dmesg. just some brcfmac highlighted nonsense.
The Indi log looks like this:
[2019-01-30T19:34:34.234 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: startup: /usr/bin/indiserver -v -p 7624 -f /tmp/indififob2133101 "
[2019-01-30T19:34:34.235 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: listening to port 7624 on fd 3"
[2019-01-30T19:34:34.235 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "FIFO: start indi_simulator_ccd"
[2019-01-30T19:34:34.236 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "FIFO: Starting driver indi_simulator_ccd"
[2019-01-30T19:34:34.236 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: pid=1560 rfd=4 wfd=7 efd=8"
[2019-01-30T19:34:34.236 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "FIFO: start indi_piface_focuser -n \"PiFace Focuser\""
[2019-01-30T19:34:34.236 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "With name: PiFace Focuser"
[2019-01-30T19:34:34.237 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "FIFO: Starting driver indi_piface_focuser"
[2019-01-30T19:34:34.237 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1561 rfd=5 wfd=10 efd=11"
[2019-01-30T19:34:34.237 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Client 6: new arrival from 127.0.0.1:39844 - welcome!"
[2019-01-30T19:34:34.237 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: snooping on Telescope Simulator.EQUATORIAL_EOD_COORD"
[2019-01-30T19:34:34.237 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: snooping on Telescope Simulator.TELESCOPE_INFO"
[2019-01-30T19:34:34.237 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: snooping on Telescope Simulator.GEOGRAPHIC_COORD"
[2019-01-30T19:34:34.238 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: snooping on Focuser Simulator.ABS_ROTATOR_ANGLE"
[2019-01-30T19:34:34.238 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: snooping on CCD Simulator.FILTER_SLOT"
[2019-01-30T19:34:34.238 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: snooping on CCD Simulator.FILTER_NAME"
[2019-01-30T19:34:34.238 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: snooping on SQM.SKY_QUALITY"
[2019-01-30T19:34:34.238 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_simulator_ccd: snooping on Focuser Simulator.FWHM"
[2019-01-30T19:34:34.238 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1561 died"
[2019-01-30T19:34:34.239 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.239 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #1"
[2019-01-30T19:34:34.239 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1563 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.239 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1563 died"
[2019-01-30T19:34:34.239 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.240 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #2"
[2019-01-30T19:34:34.240 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1564 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.240 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: ""
[2019-01-30T19:34:34.241 GMT CRIT ][ org.kde.kstars.indi] - INDI driver "indi_piface_focuser" crashed!
[2019-01-30T19:34:34.283 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1564 died"
[2019-01-30T19:34:34.283 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.283 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #3"
[2019-01-30T19:34:34.284 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1565 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.284 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1565 died"
[2019-01-30T19:34:34.284 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.284 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #4"
[2019-01-30T19:34:34.284 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1566 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.284 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: ""
[2019-01-30T19:34:34.288 GMT DEBG ][ org.kde.kstars.indi] - INDIListener: New device PiFace Focuser
[2019-01-30T19:34:34.309 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < CONNECTION >
[2019-01-30T19:34:34.489 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < DRIVER_INFO >
[2019-01-30T19:34:34.760 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1566 died"
[2019-01-30T19:34:34.760 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.761 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #5"
[2019-01-30T19:34:34.761 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1567 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.761 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.762 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #6"
[2019-01-30T19:34:34.762 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1568 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.763 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1567 died"
[2019-01-30T19:34:34.763 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.763 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #7"
[2019-01-30T19:34:34.764 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1569 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.764 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1568 died"
[2019-01-30T19:34:34.764 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.765 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #8"
[2019-01-30T19:34:34.765 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1570 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.765 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1569 died"
[2019-01-30T19:34:34.766 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.766 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #9"
[2019-01-30T19:34:34.766 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1571 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.766 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1570 died"
[2019-01-30T19:34:34.767 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.767 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: restart #10"
[2019-01-30T19:34:34.767 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: pid=1572 rfd=5 wfd=11 efd=12"
[2019-01-30T19:34:34.768 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1571 died"
[2019-01-30T19:34:34.768 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: stderr EOF"
[2019-01-30T19:34:34.768 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "2019-01-30T19:34:34: Driver indi_piface_focuser: Terminated after #10 restarts."
[2019-01-30T19:34:34.769 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: "Child process 1572 died"
[2019-01-30T19:34:34.769 GMT DEBG ][ org.kde.kstars.indi] - INDI Server: ""
[2019-01-30T19:34:34.825 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < DEBUG >
[2019-01-30T19:34:34.857 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < POLLING_PERIOD >
[2019-01-30T19:34:34.880 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < CONFIG_PROCESS >
[2019-01-30T19:34:34.916 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < CONNECTION_MODE >
[2019-01-30T19:34:34.920 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < DEVICE_PORT >
[2019-01-30T19:34:34.928 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < DEVICE_BAUD_RATE >
[2019-01-30T19:34:34.934 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < DEVICE_AUTO_SEARCH >
[2019-01-30T19:34:34.939 GMT DEBG ][ org.kde.kstars.indi] - < PiFace Focuser >: < DEVICE_PORT_SCAN >

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