- Wed Jan 28, 2015 5:59 am
#8396
I have been trying to get current time from NTP server, using ESP8266 module.
I used following set of commands:
When ">" symbol apeared, I sent 48 bytes of NTP request. Then strange thing happened - module was still waiting for more data! I finaly received "ERROR" message after continuously feeding it with more bytes (or maybe sending \r\n - I don't remember). After that any operation on any connection resulted id "Busy intet..." message, so I had to reset my module once again.
I also tried with other NTP servers host names, with exactly the same result.
The strange thing is, everything is fine, when I am using IP number of the server, instead of host name. Module returns "SEND OK" after receiving 48 bytes of data.
It looks like there is something wrong with DNS query mechanism, but only when I am using it with UDP client. Everything is fine with TCP connection. I was able to connect to the google.com using its host name and send some data back and forth.
Is there any remedy for this?
I used following set of commands:
Code: Select all
AT+RST
AT+CIPMUX=1
AT+CIPSTART=4,"UDP","time.windows.com",123
AT+CIPSEND=4,48
When ">" symbol apeared, I sent 48 bytes of NTP request. Then strange thing happened - module was still waiting for more data! I finaly received "ERROR" message after continuously feeding it with more bytes (or maybe sending \r\n - I don't remember). After that any operation on any connection resulted id "Busy intet..." message, so I had to reset my module once again.
I also tried with other NTP servers host names, with exactly the same result.
The strange thing is, everything is fine, when I am using IP number of the server, instead of host name. Module returns "SEND OK" after receiving 48 bytes of data.
It looks like there is something wrong with DNS query mechanism, but only when I am using it with UDP client. Everything is fine with TCP connection. I was able to connect to the google.com using its host name and send some data back and forth.
Is there any remedy for this?
