# \[WP7605\]\[SW\] Relation to MCU busy and No return after cm command

**URL:** <https://forum.legato.io/t/wp7605-sw-relation-to-mcu-busy-and-no-return-after-cm-command/5300>\
**Category:** Legato Linux distribution (Yocto project)\
**Created:** [July 13, 2020, 6:21am UTC](https://forum.legato.io/t/wp7605-sw-relation-to-mcu-busy-and-no-return-after-cm-command/5300 "2020-07-13T06:21:23Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![HIROKI11976](https://avatars.discourse-cdn.com/v4/letter/h/a9adbd/32.png) [@HIROKI11976](https://forum.legato.io/u/HIROKI11976)\
**Post date:** [July 13, 2020, 6:21am UTC](https://forum.legato.io/t/wp7605-sw-relation-to-mcu-busy-and-no-return-after-cm-command/5300/1 "2020-07-13T06:21:23Z")

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Back Ground:  
This question is related the following question.

> [@\[WP7605\]\[cm\] No return after "Testing connection.." message](https://forum.legato.io/t/wp7605-cm-no-return-after-testing-connection-message/5281):
>
> Back Ground: I faced the issue that module have never been returned after “Testing connection” message by sending “cm data connection”. [2020-07-02 08:59:17.431] root@swi-mdm9x28-wp:~# cm data connect [2020-07-02 08:59:24.531] Setting up profile 1 [2020-07-02 08:59:24.548] Connecting … ok [2020-07-02 08:59:24.707] Checking if device ‘rmnet\_data0’ is up … ok [2020-07-02 08:59:24.803] Routing inet … ok [2020-07-02 08:59:24.820] mv: can’t remove ‘/etc/resolv.conf’: Device or resource busy […

Regarding to this behavior, SFDC answered this issue is caused by MCU busy during no return after executing “cm data connection”.  
However, jyijyi and fpereiraEWC said this issue is related to test connection to [www.akamari.com](http://www.akamari.com).  
So I’m not sure the relation between MCU busy and root-cause of this behavior.

Question:  
Could you tell me the detail whether this behavior is related to MCU busy or not.

Best Regards,

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**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:** [July 13, 2020, 6:51am UTC](https://forum.legato.io/t/wp7605-sw-relation-to-mcu-busy-and-no-return-after-cm-command/5300/2 "2020-07-13T06:51:12Z")

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If you have account in SFDC, better check with SWI officially.