# Error when starting Bluetooth Util **URL:** \ **Category:** Tutorials\ **Created:** [October 23, 2017, 7:41am UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834 "2017-10-23T07:41:33Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![GabiSRC](https://avatars.discourse-cdn.com/v4/letter/g/ecccb3/32.png) [@GabiSRC](https://mangoh.discourse.group/u/GabiSRC)\ **Post date:** [October 23, 2017, 7:41am UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/1 "2017-10-23T07:41:33Z")
Hi, I am currently trying to run the bluetoothUtil demo on my mangoH Green. But I get the following errors when starting the app: `Jan 6 00:16:21 | =ERR= | bt-init.sh[2995] | /legato/systems/current/apps/bluetoothUtil/read-only/bin/bt-init.sh:` `Jan 6 00:16:21 | =ERR= | bt-init.sh[2995] | line 27:` `Jan 6 00:16:21 | =ERR= | bt-init.sh[2995] | mux: not found` `Jan 6 00:16:21 | =ERR= | bt-init.sh[2995] |` `Jan 6 00:16:21 | =ERR= | bt-init.sh[2995] | /legato/systems/current/apps/bluetoothUtil/read-only/bin/bt-init.sh:` `Jan 6 00:16:21 | =ERR= | bt-init.sh[2995] | line 28:` `Jan 6 00:16:21 | =ERR= | bt-init.sh[2995] | mux: not found` `Jan 6 00:16:21 | =ERR= | bt-init.sh[2995] |` I installed the muxControl from the github [https://github.com/mangOH/MuxControl](https://github.com/mangOH/MuxControl) and they are running: `root@swi-mdm9x15:~# app status` `[running] atClient` `[running] atServer` `[running] audioService` `[running] avcService` `[running] cellNetService` `[running] dataConnectionService` `[running] fwupdateService` `[running] gpioService` `[running] modemService` `[running] positioningService` `[running] powerMgr` `[running] secStore` `[stopped] smsInboxService` `[stopped] spiService` `[stopped] tools` `[stopped] voiceCallService` `[stopped] wifi` `[stopped] wifiApTest` `[stopped] wifiClientTest` `[running] wifiService` `[stopped] wifiWebAp` `[running] bluetoothUtil` `[running] muxCtrlService` `[running] muxCtrlTools` Has anyone having the same issue? Thank you 🙂 ---
**Author:** ![dfrey](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/dfrey/32/303_2.png) [@dfrey](https://mangoh.discourse.group/u/dfrey)\ **Post date:** [October 23, 2017, 3:06pm UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/2 "2017-10-23T15:06:34Z")
OK, this is going to be a bit of a long story… MuxCtrlService and MuxCtrlTools are apps that were written a while back to manage muxing of IO on the mangOH Green from userspace using a Legato app. Later we came up with the idea of the IoT framework which was a kernel based system for setting up IoT cards including the muxing of IOs. This code lives in the legato repository under `drivers/mangoh`. More recently, we have split out the driver loading from the IoT framework. The driver loading is now done by `linux_kernel_modules/mangoh` in the mangOH repository. This driver is incompatible with the mangoh driver in the legato repository. For the IoT framework, I have been working on migrating the mangoh driver from legato into a driver that will work for the mangOH Red and Green. mangOH Red support is 95% complete. I will update the forum when I post the source for the IoT framework driver that supports mangOH Red. While you’re waiting, you can remove the `mux` commands and the echo commands from [bt-init.sh](http://bt-init.sh) and replace it with this: ``` # Set IoT card GPIO3 to high echo 7 > /sys/class/gpio/export echo out > /sys/class/gpio/gpio7/direction echo 1 > /sys/class/gpio/gpio7/value # Take the IoT card out of reset echo 2 > /sys/class/gpio/export echo out > /sys/class/gpio/direction echo 1 > /sys/class/gpio/gpio2/value ``` Let me know if you’re still stuck after trying that. ---
**Author:** ![GabiSRC](https://avatars.discourse-cdn.com/v4/letter/g/ecccb3/32.png) [@GabiSRC](https://mangoh.discourse.group/u/GabiSRC)\ **Post date:** [October 24, 2017, 6:59am UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/3 "2017-10-24T06:59:20Z")
> [@dfrey](#): > > # Set IoT card GPIO3 to high > > echo 7 \> /sys/class/gpio/export > echo out \> /sys/class/gpio/gpio7/direction > echo 1 \> /sys/class/gpio/gpio7/value > > # Take the IoT card out of reset > > echo 2 \> /sys/class/gpio/export > echo out \> /sys/class/gpio/direction > echo 1 \> /sys/class/gpio/gpio2/value Thank you for the story, it’s always pleasant to know the story behind 🙂 So, I did what you suggested and I get `root@swi-mdm9x15:/legato/systems/current/appsWriteable/bluetoothUtil/bin# ./bt-init.sh ` `PWD is: /legato/systems/current/appsWriteable/bluetoothUtil/bin` `./bt-init.sh: line 36: can't create /sys/class/gpio/direction: Permission denied` `sh: write error: Operation not permitted` `Can't set device: Device or resource busy` `Can't initialize device: Device or resource busy` `hci0: Type: BR/EDR Bus: UART` ` BD Address: 00:00:00:00:00:00 ACL MTU: 0:0 SCO MTU: 0:0` ` DOWN` ` RX bytes:0 acl:0 sco:0 events:0 errors:0` ` TX bytes:24 acl:0 sco:0 commands:6 errors:0` `Can't init device hci0: Connection timed out (110)` I really don’t know how to get rid of this permission error… ---
**Author:** ![dfrey](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/dfrey/32/303_2.png) [@dfrey](https://mangoh.discourse.group/u/dfrey)\ **Post date:** [October 24, 2017, 3:22pm UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/4 "2017-10-24T15:22:41Z")
oops, It should have been `echo out > /sys/class/gpio/gpio2/direction` for the second block. ---
**Author:** ![GabiSRC](https://avatars.discourse-cdn.com/v4/letter/g/ecccb3/32.png) [@GabiSRC](https://mangoh.discourse.group/u/GabiSRC)\ **Post date:** [October 24, 2017, 3:39pm UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/5 "2017-10-24T15:39:38Z")
Ok, now I do not have the permission issue anymore, thank you 🙂 I still have `sh: write error: Device or resource busy` `Can't set device: Device or resource busy` And I do not see my talon bluetooth IoT card leds ON. I put my IoT card on the slot 0; maybe it should be a different one? ---
**Author:** ![dfrey](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/dfrey/32/303_2.png) [@dfrey](https://mangoh.discourse.group/u/dfrey)\ **Post date:** [October 24, 2017, 5:10pm UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/6 "2017-10-24T17:10:20Z")
Sorry, I just realize that I sent you down the wrong path. For some reason I thought you were using a mangOH Red. Since you are using a mangOH Green, it should just be a matter of creating an appropriate SDEF and building that. Take a look at this for example: [https://github.com/mangOH/Demos/blob/master/smartBoat.sdef](https://github.com/mangOH/Demos/blob/master/smartBoat.sdef) You can take out all of the apps except for `bluetoothUtil`. The mangOH\_Green.sdef (that is reference by the above example) is what provides the `mux` command. Also, please undo the modifications to [bt-init.sh](http://bt-init.sh) that I suggested previously since those were based on my (incorrect) understanding that you are using mangOH Red. ---
**Author:** ![GabiSRC](https://avatars.discourse-cdn.com/v4/letter/g/ecccb3/32.png) [@GabiSRC](https://mangoh.discourse.group/u/GabiSRC)\ **Post date:** [October 25, 2017, 7:29am UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/7 "2017-10-25T07:29:34Z")
Hi, Ok, but I do not understand how I am suppose to build the application from a .sdef file. Could you please elaborate? I thought that to build an app, I had only to go the sample folder and run `make` or `mkapp -t wp85 <.adef file>`. When I run the `mkapp` command on the .sdef file I have: `Path 'containerTracking.sdef' does not end in '.adef'.` I ran these commands from my ubuntu VM on which the legato tools is installed. Also, I do not understand how the mux command is provided from this file. Thank you ---
**Author:** ![dfrey](https://sea2.discourse-cdn.com/flex016/user_avatar/mangoh.discourse.group/dfrey/32/303_2.png) [@dfrey](https://mangoh.discourse.group/u/dfrey)\ **Post date:** [October 25, 2017, 4:29pm UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/8 "2017-10-25T16:29:08Z")
`mksys -t wp85 path/to/system.sdef` The sdef represents an entire legato system. So it builds all the apps. ---
**Author:** ![FebinPS](https://avatars.discourse-cdn.com/v4/letter/f/fbc32d/32.png) [@FebinPS](https://mangoh.discourse.group/u/FebinPS)\ **Post date:** [March 1, 2018, 9:29am UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/9 "2018-03-01T09:29:33Z")
Hi, I am at a similar fix. why is that we get **-sh: mux: not found** when using mux commands ? ---
**Author:** ![FebinPS](https://avatars.discourse-cdn.com/v4/letter/f/fbc32d/32.png) [@FebinPS](https://mangoh.discourse.group/u/FebinPS)\ **Post date:** [March 1, 2018, 11:35am UTC](https://mangoh.discourse.group/t/error-when-starting-bluetooth-util/834/10 "2018-03-01T11:35:45Z")
Is there any way we can circumvent the use of mux commands ?