ESP8266 Arduino WebServer stops working after few refreshes
Posted: Mon Dec 01, 2014 3:20 pmI am trying to implement a simple webserver with ESP8266 module and 3.3v Arduino mini.... Prepared a dedicated pcb with AMS117 3.3v regulator... Webserver will be posting some analog sensor data to my network, connecting to my modem-router... I am using a sketch by Ray Wang @ rayshobby.net ... everything seems ok and webserver working for a while and sending data to my browser via its IP... after some refreshes (not consistent, may work for a while) it stops sending data to my browser... but I can still ping the module via IPCONFIG and see its still working... just stops data transfer to my browser... It restarts sending if I hard reset the module.. I attached my sketch for reference... any ideas?
Dincer
Dincer
Code: Select all
/* ====== ESP8266 Demo ======
* Print out analog values
* ==========================
*
* Change SSID and PASS to match your WiFi settings.
* The IP address is displayed to soft serial upon successful connection.
*
* Ray Wang @ Rayshobby LLC
* http://rayshobby.net/?p=9734
*/
// comment this part out if not using LCD debug
#include <SoftwareSerial.h>
SoftwareSerial dbg(7, 8); // using pin 7, 8 for software serial
enum {WIFI_ERROR_NONE=0, WIFI_ERROR_AT, WIFI_ERROR_RST, WIFI_ERROR_SSIDPWD, WIFI_ERROR_SERVER, WIFI_ERROR_UNKNOWN};
#define BUFFER_SIZE 128
#define SSID "YourSSID" // change this to match your WiFi SSID
#define PASS "YourPASS" // change this to match your WiFi password
#define PORT "8080" // using port 8080 by default
char buffer[BUFFER_SIZE];
void setup() {
Serial.begin(115200);
Serial.setTimeout(5000);
dbg.begin(9600);
dbg.println("begin.");
byte err = setupWiFi();
if (err) {
// error, print error code
dbg.print("setup error:");
dbg.println((int)err);
} else {
// success, print IP
dbg.print("ip addr:");
char *ip = getIP();
if (ip) {
dbg.println(ip);
}
else {
dbg.println("none");
}
maxTimeout();
}
}
bool maxTimeout() {
// send AT command
Serial.print("AT+CIPSTO=0"); Serial.print("\r\n");
if(Serial.find("OK")) {
return true;
} else {
return false;
}
}
char* getIP() {
// send AT command
Serial.print("AT+CIFSR"); Serial.print("\r\n");
// the response from the module is:
// AT+CIFSR\n\n
// 192.168.x.x\n
// so read util \n three times
Serial.readBytesUntil('\n', buffer, BUFFER_SIZE);
Serial.readBytesUntil('\n', buffer, BUFFER_SIZE);
Serial.readBytesUntil('\n', buffer, BUFFER_SIZE);
delay(500);
buffer[strlen(buffer)-1]=0;
return buffer;
}
void loop() {
int ch_id, packet_len;
char *pb;
Serial.readBytesUntil('\n', buffer, BUFFER_SIZE);
if(strncmp(buffer, "+IPD,", 5)==0) {
// request: +IPD,ch,len:data
sscanf(buffer+5, "%d,%d", &ch_id, &packet_len);
if (packet_len > 0) {
// read serial until packet_len character received
// start from :
pb = buffer+5;
while(*pb!=':') pb++;
pb++;
if (strncmp(pb, "GET /", 5) == 0) {
serve_homepage(ch_id);
}
}
}
buffer[0] =0;
}
void serve_homepage(int ch_id) {
String header = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\nConnection: close\r\nRefresh: 5\r\n";
String content="";
// output the value of each analog input pin
for (int analogChannel = 0; analogChannel < 6; analogChannel++) {
int sensorReading = analogRead(analogChannel);
content += "analog input ";
content += analogChannel;
content += " is ";
content += sensorReading;
content += "<br />\n";
}
header += "Content-Length:";
header += (int)(content.length());
header += "\r\n\r\n";
Serial.print("AT+CIPSEND=");
Serial.print(ch_id);
Serial.print(",");
Serial.print(header.length()+content.length()); Serial.print("\r\n");
if (Serial.find(">")) {
Serial.print(header);
Serial.print(content);
delay(20);
}
/*Serial.print("AT+CIPCLOSE=");
Serial.println(ch_id);*/
}
byte setupWiFi() {
Serial.print("AT"); Serial.print("\r\n");
if(!Serial.find("OK")) {
dbg.println("WIFI_ERROR_AT");
return WIFI_ERROR_AT;
}
delay(500);
// reset WiFi module
Serial.print("AT+CWMODE=3"); Serial.print("\r\n");
Serial.print("AT+RST"); Serial.print("\r\n");
if(!Serial.find("ready")) {
dbg.println("WIFI_ERROR_RST");
return WIFI_ERROR_RST;
}
delay(500);
// set mode 3
Serial.print("AT+CWJAP=\"");
Serial.print(SSID);
Serial.print("\",\"");
Serial.print(PASS);
Serial.println("\"");
delay(2000);
if(!Serial.find("OK")) {
dbg.println("WIFI_ERROR_SSIDPWD");
return WIFI_ERROR_SSIDPWD;
}
delay(500);
// start server
Serial.print("AT+CIPMUX=1"); Serial.print("\r\n");
if(!Serial.find("OK")){
dbg.println("WIFI_ERROR_SERVER");
return WIFI_ERROR_SERVER;
}
delay(500);
Serial.print("AT+CIPSERVER=1,"); // turn on TCP service
Serial.print(PORT); Serial.print("\r\n");
if(!Serial.find("OK")){
dbg.println("WIFI_ERROR_SERVER");
return WIFI_ERROR_SERVER;
}
delay(500);
dbg.println("WIFI_ERROR_NONE");
return WIFI_ERROR_NONE;
}