Sorry for my late reply. I could not control the telescope yet. please help! Here is the output: bao@bao-desktop:~$ dmesg | tail -n 20 [ 11.556640] brcmfmac: brcmf_add_if: ignore IF event [ 11.565773] brcmfmac: power management disabled [ 11.785255] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 11.785277] Bluetooth: BNEP filters: protocol multicast [ 11.785302] Bluetooth: BNEP socket layer initialized [ 12.760774] brcmfmac: brcmf_add_if: ERROR: netdev:wlan0 already exists [ 12.760798] brcmfmac: brcmf_add_if: ignore IF event [ 24.407431] fuse init (API version 7.23) [ 30.436181] Bluetooth: RFCOMM TTY layer initialized [ 30.436245] Bluetooth: RFCOMM socket layer initialized [ 30.436297] Bluetooth: RFCOMM ver 1.11 [ 72.972470] usb 1-1.2: USB disconnect, device number 4 [ 74.744076] usb 1-1.2: new high-speed USB device number 7 using dwc_otg [ 74.844944] usb 1-1.2: New USB device found, idVendor=04cc, idProduct=0000 [ 74.844965] usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 74.844979] usb 1-1.2: Product: Meade eFinder Serial Emulator [ 74.844991] usb 1-1.2: Manufacturer: Meade [ 74.845002] usb 1-1.2: SerialNumber: 1234567890 [ 74.846371] cdc_acm 1-1.2:1.0: Zero length descriptor references [ 74.846397] cdc_acm: probe of 1-1.2:1.0 failed with error -22Read More...