---
- name: check if wifi-connection(-file) exists
  stat:
    path: /etc/NetworkManager/system-connections/SchulWLAN.nmconnection
  register: stat_result
- name: connect device to internal wifi "schulnetz"
  block:
  - name: add hidden wifi
    command: nmcli connection add type wifi con-name SchulWLAN ifname {{ wifi_ifname }} ssid {{ wlan-ssid }}
  - name: modify wifi password
    command: nmcli connection modify SchulWLAN wifi-sec.key-mgmt wpa-psk wifi-sec.psk "{{ wlan-pw }}"
  - name: autoconnect wifi
    command: nmcli connection modify SchulWLAN connection.autoconnect yes
  - name: modify wifi hidden
    command: nmcli connection modify SchulWLAN 802-11-wireless.hidden yes
  - name: connect wifi
    command: nmcli connection up SchulWLAN
  when: not stat_result.stat.exists and ("notebooks" in group_names)
...