cool to see MBox driver for INDI. To be honest I use the driver also for interfacing the Stickstation (as I still have one). In a first EKOS start the driver crashed, could be connected afterwards again and runs fine. Attached parts of the log file. Hope this helps:
INFO 0.015602 sec : Session log file /home/mw/.indi/logs/2017-10-22/indi_mbox_weather/indi_mbox_weather_14:16:12.log
DEBUG 0.663725 sec : Connecting to /dev/ttyUSB0
DEBUG 0.665802 sec : Port FD 3
DEBUG 0.666001 sec : Connection successful, attempting handshake...
DEBUG 0.666055 sec : CMD <:calget*>
DEBUG 0.668082 sec : RES <ÿ÷5*1Ô>
ERROR 0.668231 sec : CRC check failed!
DEBUG 0.668272 sec : Handshake failed.
WARNING 0.668309 sec : Communication with /dev/ttyUSB0 @ 38400 failed. Starting Auto Search...
DEBUG 0.668361 sec : Trying connection to /dev/ttyUSB0 @ 38400 ...
DEBUG 0.668398 sec : Connecting to /dev/ttyUSB0
DEBUG 0.669012 sec : Port FD 5
DEBUG 0.669149 sec : Connection successful, attempting handshake...
DEBUG 0.669201 sec : CMD <:calget*>
DEBUG 0.885114 sec : RES <$PXDR,P,95083,P,0,C,27.5,C,1,H,35.0,P,2,C,10.7,C,3,1.35*1A>
INFO 0.885266 sec : MBox is online.
DEBUG 0.887749 sec : Configuration successfully saved for DEVICE_PORT.
DEBUG 0.908112 sec : Configuration successfully saved for DEVICE_BAUD_RATE.
DEBUG 0.910200 sec : Configuration successfully saved for CONNECTION_MODE.
INFO 0.918394 sec : Weather update is in progress...
DEBUG 5.339125 sec : RES <$PXDR,P,95088,P,0,C,27.5,C,1,H,35.0,P,2,C,10.7,C,3,1.35*11>
DEBUG 9.791482 sec : RES <$PXDR,P,95085,P,0,C,27.5,C,1,H,35.0,P,2,C,10.7,C,3,1.35*1C>
DEBUG 9.798535 sec : Toggle Debug Level -- Driver Debug
DEBUG 9.798691 sec : Toggle Logging Level -- Driver Debug
INFO 9.798780 sec : Session log file /home/mw/.indi/logs/2017-10-22/indi_mbox_weather/indi_mbox_weather_14:16:12.log
DEBUG 9.799417 sec : Configuration successfully loaded.
DEBUG 14.245782 sec : RES <$PXDR,P,95090,P,0,C,27.5,C,1,H,35.1,P,2,C,10.7,C,3,1.35*19>
DEBUG 18.699489 sec : RES <$PXDR,P,95089,P,0,C,27.5,C,1,H,35.1,P,2,C,10.7,C,3,1.35*11>
DEBUG 23.153096 sec : RES <$PXDR,P,95088,P,0,C,27.5,C,1,H,35.1,P,2,C,10.7,C,3,1.35*10>
DEBUG 27.606634 sec : RES <$PXDR,P,95088,P,0,C,27.4,C,1,H,35.1,P,2,C,10.7,C,3,1.35*11>
DEBUG 32.059851 sec : RES <$PXDR,P,95084,P,0,C,27.4,C,1,H,35.1,P,2,C,10.7,C,3,1.35*1D>
DEBUG 36.513980 sec : RES <$PXDR,P,95086,P,0,C,27.4,C,1,H,35.1,P,2,C,10.7,C,3,1.35*1F>
DEBUG 40.967498 sec : RES <$PXDR,P,95086,P,0,C,27.4,C,1,H,35.2,P,2,C,10.7,C,3,1.35*1C>
DEBUG 45.421207 sec : RES <$PXDR,P,95086,P,0,C,27.4,C,1,H,35.2,P,2,C,10.7,C,3,1.35*1C>
DEBUG 49.875035 sec : RES <$PXDR,P,95087,P,0,C,27.4,C,1,H,35.2,P,2,C,10.7,C,3,1.35*1D>
DEBUG 54.327879 sec : RES <$PXDR,P,95089,P,0,C,27.4,C,1,H,35.1,P,2,C,10.7,C,3,1.35*10>
DEBUG 58.782234 sec : RES <$PXDR,P,95086,P,0,C,27.4,C,1,H,35.2,P,2,C,10.7,C,3,1.35*1C>
DEBUG 63.236027 sec : RES <$PXDR,P,95087,P,0,C,27.4,C,1,H,35.2,P,2,C,10.7,C,3,1.35*1D>
DEBUG 67.689078 sec : RES <$PXDR,P,95083,P,0,C,27.4,C,1,H,35.1,P,2,C,10.7,C,3,1.35*1A>