arduino_uip
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ntruchsess
WebClient only works occasionally
Hello
I'am trying to get an arduino webclient code to work. I am trying to fetch www.google.com
My issue is: It only works occasionally, lets say 1 time out of 5. 4 times out of 5 it times out and says "connection failed."
I am using an arduino UNO and ENC28J60 marked: ENC28J60-I/SO e3, 1246A7S I am using arduino ide 1.5.8 and UIPethernet 1.59
What can be wrong? I have tried the following / I know the following:
-Level translator on 3,3V data pin from ENC28J60 to arduino. No difference at all. -Turned on debugging and sees that ARP runs.
This is my sketch, and further below the response code when functioning and failing
#include <SPI.h>
#include <UIPEthernet.h>
EthernetClient client;
void setup() {
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
byte mac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
char server[] = "www.google.com";
IPAddress ip(192, 168, 77, 177);
Ethernet.begin(mac);
Serial.print("localIP: ");
Serial.println(Ethernet.localIP());
Serial.print("subnetMask: ");
Serial.println(Ethernet.subnetMask());
Serial.print("gatewayIP: ");
Serial.println(Ethernet.gatewayIP());
Serial.print("dnsServerIP: ");
Serial.println(Ethernet.dnsServerIP());
delay(1000);
Serial.println("connecting...");
// if you get a connection, report back via serial:
if (client.connect(server, 80)) {
Serial.println("connected");
// Make a HTTP request:
client.println("GET /search?q=arduino HTTP/1.1");
client.println("Host: www.google.com");
client.println("Connection: close");
client.println();
} else {
// if you didn't get a connection to the server:
Serial.println("connection failed");
}
}
void loop() {
// if there are incoming bytes available
// from the server, read them and print them:
if (client.available()) {
char c = client.read();
Serial.print(c);
}
//Serial.print("-");
// if the server's disconnected, stop the client:
if (!client.connected()) {
Serial.println();
Serial.println("disconnecting.");
client.stop();
// do nothing forevermore:
while (true) {
//Serial.print("EL");
}
}
}
***************** serial print out when functioning
localIP: 192.168.77.54
subnetMask: 255.255.255.0
gatewayIP: 192.168.77.1
dnsServerIP: 192.168.77.1
connecting...
connected
HTTP/1.1 302 Found
Location: http://www.google.se/search?q=arduino&gws_rd=cr&ei=Wa5FV9ipLMq6swHt9Lm4Cg
Cache-Control: private
Content-Type: text/html; charset=UTF-8
P3P: CP="This is not a P3P policy! See https://www.google.com/support/accounts/answer/151657?hl=en for more info."
Date: Wed, 25 May 2016 13:53:29 GMT
Server: gws
Content-Length: 278
X-XSS-Protection: 1; mode=block
X-Frame-Options: SAMEORIGIN
Set-Cookie: NID=79=H2CvpT9Y55kdPccpqfrPq5R6I3JyFXopiHP1jskstWS8mG8tOed0hHypMhuV2ww_--OdmSRGgREoNuozifunA9cPx07jL-H45UplTXJbaQFSVsbDSG59qb_3kQb6ePAy; expires=Thu, 24-Nov-2016 13:53:29 GMT; path=/; domain=.google.com; HttpOnly
Connection: close
<HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8">
<TITLE>302 Moved</TITLE></HEAD><BODY>
<H1>302 Moved</H1>
The document has moved
<A HREF="http://www.google.se/search?q=arduino&gws_rd=cr&ei=Wa5FV9ipLMq6swHt9Lm4Cg">here</A>.
</BODY></HTML>
disconnecting.
*******************
********************serial print when not functioning
localIP: 192.168.77.54
subnetMask: 255.255.255.0
gatewayIP: 192.168.77.1
dnsServerIP: 192.168.77.1
connecting...
connection failed
disconnecting.
I don't know the cause, but I can confirm that DHCP will fail for me about every other time I initialize a device, however the static configuration is reliable.
I have exactly this issue. Once it works - it works for a long time (several hundred requests), when it fails, it keeps failing. In my case, when it fails, I reset the device, and the arduino, and try again. I am using DHCP, which works reliably for me - every time I get a valid IP address, however it fails to connect to the remote server.
Any ideas appreciated !
