7.1.1 MQTT-Update
- NEW: 7.1.1: bug fix wlan password with "=" (again)
- MQTT error message: changes "no error", send retain flag
- Update wlan handling to esp-idf 4.1
- Upgrade digital CNN to v8.7.0 (added new images)
- Bug fix: MQTT, WLAN, LED-Controll, GPIO usage, fixed IP, calculation flow rate