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PPP Library seems work only on debug mode

Hi all,

i'm using network library PPP over USART1 on Nucleo STM32F410. USART1 is connected with a external Telit Modem at the moment using only TX and RX pin (PA9 tx and PA10 rx).
Also i'm using stdout user on ST-Link usb2serial virtual port towards win7 pc.

If i using a RTE ipv4/ipv6 network component 7.8.0 in release mode my simple application is not able to obtain PPP ip address and DNS address from the network. If i use RTE ipv4/ipv6 rel 7.8.0 network component in full debug mode (stdout debug) my application alway obtain PPP ip address and DNS address.

I've tested a lot of time .... obtaining always the same results.

Somebody know if there are some reason fro that or if i wrong somethings ?

Thanks in advance
B/R
Fabio