ESP8266 Developer Zone The Official ESP8266 Forum 2015-02-05T16:23:18+08:00 https://bbs.espressif.com:443/feed.php?f=16&t=123 2015-02-05T16:23:18+08:00 2015-02-05T16:23:18+08:00 https://bbs.espressif.com:443/viewtopic.php?t=123&p=640#p640 <![CDATA[Re: AT+CIPSTART bug when using UDP and DNS lookup]]>
please have a try and feel free to let us know if you have any question ~

http://bbs.espressif.com/viewtopic.php?f=5&t=154

Thanks for your interest in ESP8266 !

Statistics: Posted by ESP_Faye — Thu Feb 05, 2015 4:23 pm

]]> 2015-01-06T15:36:57+08:00 2015-01-06T15:36:57+08:00 https://bbs.espressif.com:443/viewtopic.php?t=123&p=452#p452 <![CDATA[Re: AT+CIPSTART bug when using UDP and DNS lookup]]> :oops: oops.. I totally forgot github.. so sorry for the inconvenience..

I have replicated your problem, we are working on it.

Thanks for the bug report.

Statistics: Posted by ESP_Faye — Tue Jan 06, 2015 3:36 pm

]]> 2015-01-06T04:40:16+08:00 2015-01-06T04:40:16+08:00 https://bbs.espressif.com:443/viewtopic.php?t=123&p=449#p449 <![CDATA[AT+CIPSTART bug when using UDP and DNS lookup]]>
I am using at_v0.20_14_11_28 to contact a NTP server via UDP. If I use the IP address it works ok as below

AT+CIPMUX=0
AT+CIPSTART="UDP","134.130.4.17",123
AT+CIPSEND=48
(NTP data Recieved OK)

However if I use a domain name, the DNS lookup works correctly but the following AT+CIPSEND hangs with no > data prompt

AT+CIPMUX=0
AT+CIPSTART="UDP","pool.ntp.org",123
AT+CIPSTATUS - returns +CIPSTATUS:0,"UDP","217.114.59.3",123,25349,0 (which is correct at the time)
AT+CIPSEND=48 - hangs with no > data prompt

I have looked at the source code for AT+CIPSTART in 'at_ipCmd.c' and i see that for a UDP start with IP address
espconn_create is called at line 818 (TCP calls espconn_connect). However if a DNS lookup is required, the callback function
at_dns_found calls espconn_connect for both TCP and UDP !

I think at_dns_found should call espconn_create for UDP ?

Also at line 731 "ALREAY CONNECT\r\n" should be "ALREADY CONNECT\r\n" or even better english is "ALREADY CONNECTED\r\n"

I hope you can correct this problem. I cannot build the code myself yet. If you like to post new user.bin file I can test it out

Congratulations on a great device !

Thankyou
Dennis Tricker
UK

Statistics: Posted by trickedj — Tue Jan 06, 2015 4:40 am

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