switch off Modem an on again (IDFGH-10544)

[diplfranzhoepfinger]

Answers checklist.

• I have read the documentation for esp-protocols components and the issue is not addressed there.
• I have updated my esp-protocols branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

Code:
https://github.com/diplfranzhoepfinger/esp-protocols-tree-master-components-esp_modem-examples-simple_cmux_client/tree/feature/CMUX_PWR_DOWN_UP

Log:
https://gist.github.com/diplfranzhoepfinger/744cb0e775afe25e9d8b5d70b4627d3d

I want to switch off the Modem, switch it on again,
and then make again a CMUX Session with Data and Command Channel.

but i get a URC of +PPPD: DISCONNECTED

how to solve this ?

[diplfranzhoepfinger]

i thnik we will need a new ppp and/or netif Object, but i am far away of an Expert in this. 

@david-cermak

[diplfranzhoepfinger]

i guess we need something like this:

    // UART DTE clean-up
    esp_modem_destroy(dce);
    esp_netif_destroy(esp_netif);

but this code is from pppos Sample, and 'esp_modem_destroy' is not available in C++

also which Code is required to re-establish the dce and netif ? 

this are only guesses, we need clear advice here.

[diplfranzhoepfinger]

Hi, 

i tried hard to destroy DCE and Netif, 

but it leads to crashes:

Log:

https://gist.github.com/diplfranzhoepfinger/8d679dcb099aa86aca3d977f53543111
Guru Meditation Error: Core  0 panic'ed (IllegalInstruction). Exception was unhandled.

Code:

https://github.com/diplfranzhoepfinger/esp-protocols-tree-master-components-esp_modem-examples-simple_cmux_client/tree/feature/CMUX_PWR_DOWN_UP_with_new_netif

[diplfranzhoepfinger]

made another Try:

Log: 
https://gist.github.com/diplfranzhoepfinger/2fd9c7bacefa3159fa7712361cf03455
Code: 
https://github.com/diplfranzhoepfinger/esp-protocols-tree-master-components-esp_modem-examples-simple_cmux_client/tree/feature/CMUX_PWR_DOWN_UP_with_new_netif2

Not Successful.

assert failed: spinlock_acquire spinlock.h:122 (lock->count == 0)

[diplfranzhoepfinger]

VERY Curious:

after trying forth and back,
we have now a running Configuration:

Code: https://github.com/diplfranzhoepfinger/esp-protocols-tree-master-components-esp_modem-examples-simple_cmux_client/tree/feature/leave_CMUX2
Log: https://gist.github.com/diplfranzhoepfinger/d5725e99bc821babbc180f2606c4a13a

we have here a switch-off and a switch on of the Modem,
start CMUX again,
and get a IP Address.

so now the Question shrinks down to the Question:

why does

https://github.com/diplfranzhoepfinger/esp-protocols-tree-master-components-esp_modem-examples-simple_cmux_client/tree/feature/leave_CMUX2

work

while

https://github.com/diplfranzhoepfinger/esp-protocols-tree-master-components-esp_modem-examples-simple_cmux_client/tree/feature/CMUX_PWR_DOWN_UP

does not work.

[diplfranzhoepfinger]

Curious 2:

Log: https://gist.github.com/diplfranzhoepfinger/4f945347e35d9684b53ea24eb5bca051
Code: https://github.com/diplfranzhoepfinger/esp-protocols-tree-master-components-esp_modem-examples-simple_cmux_client/tree/feature/leave_CMUX3

still working.

[diplfranzhoepfinger]

and 3

Log: https://gist.github.com/diplfranzhoepfinger/5aa5d6eee2c6a31bae07409e066a1db8
Code: https://github.com/diplfranzhoepfinger/esp-protocols-tree-master-components-esp_modem-examples-simple_cmux_client/tree/feature/leave_CMUX4

not working.

[diplfranzhoepfinger]

and next:

Log:
https://gist.github.com/diplfranzhoepfinger/4ee1a7f61b107dc1ecd80c9a1d34a4b5
Code: feature/leave_CMUX5

tokk over 3 Lines from the non-Working branch, but still working ?

isn't this curious ?

[david-cermak]

I guess you just have to send a hanpup() command (ATH) to complete the closure correctly.

[david-cermak]

Closing, feel free to reopen