Latitude 7400 sms empfangen

Hello i've got a Latitude 7400 (Win10) with integrated snapdrgon x20 modem.

I try to send and receive sms using at-commands in self written application.

Send sms works well but receive sms dont work.

I can read sms from sim inbox (received with sim in mobile phone) but can't receive new one.

Incomming sms can are shown in Windows 10 Message App but i need them in own App.

Any Idea?

Irgendwelche Ideen? Wenn Windows die Nachrichten bekommen kann wie geht das?