I've uploaded this to a Wemos D1 mini, the only change to the code is adding my wifi details, when monitoring the serial output I get this and it doesn't do anything else:
Connecting
Connected to VM6768509
IP address: 192.168.4.46
Starting UDP
Local port: 123
Time server IP: 255.255.255.255
Sending NTP request ...
I've uploaded this to a Wemos D1 mini, the only change to the code is adding my wifi details, when monitoring the serial output I get this and it doesn't do anything else: