# Interfacing BT module **URL:** \ **Category:** Legato Linux distribution (Yocto project)\ **Created:** [June 18, 2021, 5:50am UTC](https://forum.legato.io/t/interfacing-bt-module/5847 "2021-06-18T05:50:50Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![akshaysk](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/akshaysk/32/1212_2.png) [@akshaysk](https://forum.legato.io/u/akshaysk)\ **Post date:** [June 18, 2021, 5:50am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/1 "2021-06-18T05:50:50Z")
Hi there , I am trying to bring up a BT (HCI interface) module using hciconfig but it fails with error no.99 . Note : ttyUSB here is a cp210x (USB-UART bridge) connected via HSIC Below are the logs **root@swi-mdm9x28-wp:~# hciattach -s 115200 /dev/ttyUSB2 any 115200 noflow nosleep** **Device setup complete** **root@swi-mdm9x28-wp:~# hciconfig -a** **hci0: Type: Primary Bus: UART** \*\* BD Address: 00:00:00:00:00:00 ACL MTU: 27:7 SCO MTU: 0:0\*\* \*\* DOWN \*\* \*\* RX bytes:205 acl:0 sco:0 events:14 errors:0\*\* \*\* TX bytes:80 acl:0 sco:0 commands:14 errors:0\*\* \*\* Features: 0x00 0x00 0x00 0x00 0x60 0x00 0x00 0x00\*\* \*\* Packet type: DM1 DH1 HV1 \*\* \*\* Link policy: \*\* \*\* Link mode: MASTER\*\* **root@swi-mdm9x28-wp:~# hciconfig hci0 up** **Can’t init device hci0: Cannot assign requested address (99)** **root@swi-mdm9x28-wp:~# hciconfig hci0 up** **Can’t init device hci0: Cannot assign requested address (99)** **root@swi-mdm9x28-wp:~# hciconfig hci0 up** **Can’t init device hci0: Cannot assign requested address (99)** **root@swi-mdm9x28-wp:~# hciconfig hci0 up** **Can’t init device hci0: Cannot assign requested address (99)** **root@swi-mdm9x28-wp:~# hciconfig hci0 up** **Can’t init device hci0: Cannot assign requested address (99)** **root@swi-mdm9x28-wp:~# dmesg** **[279.364430] Bluetooth: cb613de8** **[279.364460] Bluetooth: cb613de0Bluetooth: cb613de0** **[279.364489] Bluetooth: cb613de0Bluetooth: cb613de0** **[279.364509] Bluetooth: cb613de0** **root@swi-mdm9x28-wp:~# lsmod** Not tainted **hci\_uart 40947 1 - Live 0xbf099000** **cp210x 14719 1 - Live 0xbf090000** **usbserial 32675 3 cp210x, Live 0xbf082000** **bnep 13580 2 - Live 0xbf07a000** **bluetooth 387916 7 hci\_uart,bnep, Live 0xbf000000** **root@swi-mdm9x28-wp:~#** **root@swi-mdm9x28-wp:/usr/libexec# ./bluetooth/bluetoothd -v** **5.50** **root@swi-mdm9x28-wp:~# bluetoothctl --v** **bluetoothctl: 5.50** **root@swi-mdm9x28-wp:~# uname -r** **3.18.140** **root@swi-mdm9x28-wp:~# cm info** **Device: WP7608** **IMEI: 352913090221431** **IMEISV: E** **FSN: XG910670081610** **Firmware Version: SWI9X07Y\_02.37.03.00 73df45 jenkins 2020/04/08 10:59:14** **Bootloader Version: SWI9X07Y\_02.37.03.00 73df45 jenkins 2020/04/08 10:59:14** **MCU Version: 002.015** **PRI Part Number (PN): 9908665** **PRI Revision: 001.001** **Carrier PRI Name: GENERIC** **Carrier PRI Revision: 002.095\_000** **SKU: 1104194** **Last Reset Cause: Reset, User Requested** **Resets Count: Expected: 93 Unexpected: 0** Same BT module works fine with a raspberry pi B and the Laptop . Did someone face this kind of error ? Any other configs need to be enabled on the kernel ? ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [June 18, 2021, 6:48am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/2 "2021-06-18T06:48:21Z")
you can see this document on what has been enabled in kernel for testing bluetooth WL18xx IOT card > **[Bluetooth/BLE working with WL18xx?](https://forum.mangoh.io/t/bluetooth-ble-working-with-wl18xx/5432/2)** > > I have tried on WP77 FW R9, you can have a look on this document: ---
**Author:** ![akshaysk](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/akshaysk/32/1212_2.png) [@akshaysk](https://forum.legato.io/u/akshaysk)\ **Post date:** [June 18, 2021, 7:49am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/3 "2021-06-18T07:49:18Z")
Hi @jyijyi I Have enabled all the configs mentioned in the doc . Still no luck Did you try any other BT modules ? other than QC and Ti ? I am Trying to understand the difference ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [June 18, 2021, 8:00am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/4 "2021-06-18T08:00:19Z")
no, i only tried WL18xx IOT card before. Did you follow the bluetoothUtil.rar\bluetoothUtil\scriptbt-init.sh? ---
**Author:** ![akshaysk](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/akshaysk/32/1212_2.png) [@akshaysk](https://forum.legato.io/u/akshaysk)\ **Post date:** [June 18, 2021, 8:34am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/5 "2021-06-18T08:34:41Z")
Can you share me the file [https://github.com/mangOH/Demos/tree/master/BluetoothUtil](https://github.com/mangOH/Demos/tree/master/BluetoothUtil) this link doesn’t seems to be working . ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [June 18, 2021, 8:38am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/6 "2021-06-18T08:38:46Z")
it is inside the document ---
**Author:** ![akshaysk](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/akshaysk/32/1212_2.png) [@akshaysk](https://forum.legato.io/u/akshaysk)\ **Post date:** [June 18, 2021, 9:12am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/7 "2021-06-18T09:12:13Z")
Yes thanks got it . I am following the same initialisation sequence mentioned in the script . By any chance you can try with a BT module (like Nordic) ? Did any of sierra’s customers use BT modules other than Ti & QC ? I have a very limited support from BT module vendor as things are working on RPi and laptop . ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [June 18, 2021, 9:18am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/8 "2021-06-18T09:18:46Z")
you can see the bluetooth implementation on mangoh yellow (using WM-BN-CYW-48): > **[Bluetooth mangoH yellow launch](https://forum.mangoh.io/t/bluetooth-mangoh-yellow-launch/5665)** > > Hi, Is there a procedure to follow in order to detect the bluetooth using the mangoH yellow? Thanks ---
**Author:** ![akshaysk](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/akshaysk/32/1212_2.png) [@akshaysk](https://forum.legato.io/u/akshaysk)\ **Post date:** [June 23, 2021, 9:26am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/9 "2021-06-23T09:26:03Z")
Hi @jyijyi , It seems that Kernel 3.18.140 is too old to support controllers without a public address . As the BT module I am using has no public address embedded in the hardware memory . It fails to assign a random address which results in **Can’t init device hci0: Cannot assign requested address (99)** Source : [devel@lists.zephyrproject.org | hciconfig tools error with nrf52832 running zephyr](https://lists.zephyrproject.org/g/devel/topic/hciconfig_tools_error_with/24942075?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,60,24942075) Let me know if you have any points on this ? else we can close the topic . One can request the vendor to add a public address in the BT module firmware in order to resolve the issue . ---
**Author:** ![jyijyi](https://sea1.discourse-cdn.com/flex019/user_avatar/forum.legato.io/jyijyi/32/822_2.png) [@jyijyi](https://forum.legato.io/u/jyijyi)\ **Post date:** [June 23, 2021, 9:45am UTC](https://forum.legato.io/t/interfacing-bt-module/5847/10 "2021-06-23T09:45:20Z")
No, i don’t have other point to add