Description
Two separate ESP 12F's are set up as servers to provide temperatures from two different locations. They can both be accessed indepently from any web browser using the url 192.168.4.1 Now I try using a 3rd ESP 12F to display the data from the other two on a Nokia 5110. My sketch uses a switching scheme to access the first ESP 12F then connect with url 192.168.4.1, display the data temperature, which works fine, then disconnect from this one, access the second SSID which works up to this point, but when the client.connect is repeated on the second pass to get the other temperature, it fails, no matter what. Any suggestions?
//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
// To display temperatures from 2 servers in basement and
// kitchen on Nokia 5110
//------------------------------------------------------ Apr 30 2018
#include <ESP8266WiFi.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#include <Adafruit_PCD8544.h>
Adafruit_PCD8544 display = Adafruit_PCD8544(2, 5, 4); //DC, CE, RST (MOSI=DIN on pin 13, SCLK on pin 14)
char* ssid;
bool flip = false; //toggle flag to switch from one SSID to the other
void setup() {
display.begin();
display.setContrast(60);
display.setTextSize(1);
display.setTextColor(BLACK);
display.setCursor(0,0);
display.clearDisplay();
Serial.begin(9600);
Serial.setDebugOutput(true);
WiFi.mode(WIFI_STA);// station mode
}
unsigned long startWait;
const char* host = "192.168.4.1";
const int httpPort = 80;
String url;
void loop() {
if(!flip)ssid= "ESP 01";//if the flag is 0 start with basement server
else ssid = "ESP 12F"; //if flag is 1 switch to kitchen
WiFi.begin(ssid);// connect to either one of the two ESP8266 servers (no password)
if(!flip){
display.setCursor(0,0);
display.clearDisplay();
}
startWait = millis();
while ((WiFi.status() != WL_CONNECTED) && (millis() - startWait) < 5000 ){
delay(500);
Serial.print(".");
}
url=(String)WiFi.localIP();
if(flip) display.print("Ktch ");
else display.print("Bsmt ");
display.display();
WiFiClient client;
if(!client.connect(host, httpPort)){
display.print("fail");//this always fails on second pass
display.display();
flip=!flip;
return;//back to begining of loop()
}
//// send the request to the server (it works without url also)
client.print(String("GET /") + url+ " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n" + "r\n");
startWait=millis();
while(!client.available() && (millis()-startWait) < 5000);
if(client.available()){
String line = client.readStringUntil('\r');
String val=line.substring(0,2);//get only the first 2 characters 0,1
display.print(val);
display.println(" F");
display.display();
client.stop();
}
flip=!flip;
WiFi.disconnect();
}
I don't know how to copy-paste the debug data from the Serial Monitor but it essentially says".ap_loss" after it connects to the second SSID
P.S. I tried a scheme where I save to EEPROM the temperature data from the 1st Server then do a ESP.restart(), then access the second one (toggle flag also saved) and get the other temperature, recall the first one from EEPROM and then display them both. It works, but is there any way to solve the problem without having to reboot?