Below you find the links to the manual of the APN settings on your TP-Link device. First create a profile with TP-Link (step 1), then you can define a new APN in your TP-Link account (step 2). 

Step 1: https://www.tp-link.com/de/support/faq/964/ or attachment Anleitung_Schritt 1.pdf

Step 2: https://www.tp-link.com/de/support/faq/966/ or attachment Anleitung_Schritt 2.pdf

Our APN information as follow: 

APN: dr.m2m.ch 

User: (leave field empty) 

Password: (leave field empty) 

Important: Authentication Type: Select PAP instead of CHAP