Hi Stefan,
again many thanks. It works now. I can send data to my App. The following sequence works for Quectel BC66:
Deactivate auto sleep mode
AT+QSCLK=0
Persistent network and APN setup
AT+QBAND=1,8
AT+CFUN=0
AT*MCGDEFCONT="IP","cdp.iot.t-mobile.nl"
Restart the module as some configurations only take place after a reboot.
AT+QRST=1
After reboot wakup from sleep, deactivate auto sleep mode again and wait for network connect
AT+QSCLK=0
+IP: 10.128.0.134
Create a UDP socket and for UDP server
AT+QIOPEN=1,1,"UDP","172.27.131.100",15683,1001,0,0
Send message âHello Worldâ
AT+QISEND=1,11,48656c6c6f20576f726c64