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JAndrassy / WiFiEspAT

Arduino networking library. Standard Arduino WiFi networking API over ESP8266 or ESP32 AT commands.
GNU Lesser General Public License v2.1
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DNS fail in WebClient example #23

Closed charizord closed 4 years ago

charizord commented 4 years ago

Hello, when I attempt to use the WebClient example during the connection to the server [line 54] if (client.connect(server, 80)) I receive DNS fail (from the debug) yet when I change the the "server" char pointer to an IP address, connection is made succesfully.

JAndrassy commented 4 years ago

do you have a valid DNS server address? what is the server name, which fails?

charizord commented 4 years ago

I have tried multiple servers such as: arduino.cc , google.com , and a random http webpage I found. I haven't defined a specific DNS server, I presume my home router takes care of that as is with my computer web browser or was I supposed to define something specific with the ESP?

This is the debug when I try to connect with a URL (not ip): ` Connected to WiFi network. Starting connection to server... esp INFO: free linkId is 4 esp INFO: start TCP to arduino.cc:80 on link 4 esp> AT+CIPSTART=4,"TCP","arduino.cc",80 ...sent esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> ? esp> busy p... ...ignored esp> DNS Fail ...ignored esp> ERROR ...error esp ERROR: expected OK got ERROR

disconnecting from server. `

JAndrassy commented 4 years ago

did you try the WebClient example?

charizord commented 4 years ago

Like I said, I am using the WebClient example other than these changes : -the rx/tx pins of the software serial to pins 2/3 -the arduino serial baud rate to 9600

this is my firmware data: AT version:1.7.4.0(May 11 2020 19:13:04) SDK version:3.0.4(9532ceb) compile time:May 27 2020 10:12:17 Bin version(Wroom 02):1.7.4

this is my persistent wifi settings: Station MAC: 2C:F4:32:XX:XX:XX hostname ESP-80FD0A SSID: XXXXXX BSSID: B0:7F:B9:XX:XX:XX RSSI:-76 dBm DHCP: enabled IP Address: 192.168.XX.XX gateway IP Address: 192.168.XX.XX subnet IP mask: 255.255.255.0 ### DNS server: 255.255.255.255 <---- I noticed this is should be 1.1.1.1 in my country, could this be my issue? If yes how do I defined the DNS server in the persistent settings?

JAndrassy commented 4 years ago

in a home local network with router the DNS server is usually the router. but with DHCP the router should send the right DNS server IP.

this is not a problem of this library and I guess even not a problem of the AT firmware.