Your ROOT_URL in app.ini is https://source.parasitstudio.de:63000/ but you are visiting https://source.parasitstudio.de/wirtz/esp-link/src/commit/b652fb42dbc9387825640a53f719f56bbe234b60/mqtt You should set ROOT_URL correctly, otherwise the web may not work correctly.

Thorsten von Eicken 65ba42d5ee fix MQTT start-up		9 years ago
..
mqtt.c	Change MQTT hostname to 64 chars, fixes #147 An error occurred	9 years ago
mqtt.h	fix mqtt for new slip protocol	9 years ago
mqtt_cmd.c	fix MQTT start-up	9 years ago
mqtt_cmd.h	new SLIP protocol; basic REST working	9 years ago
mqtt_msg.c	massive rework of MQTT	10 years ago
mqtt_msg.h	Merge branch 'master' into windows	10 years ago
pktbuf.c	Fix for services page syslog filter select list	9 years ago
pktbuf.h	lots of ifdef	10 years ago