- Wed Oct 14, 2015 11:12 pm
#31371
I want to read current time from internet using ESP8266 which is interfaced with Arduino Uno. I want to display the current time read on LCD display interfaced with Arduino. Which AT command is used to get current time?
Moderator: igrr
- Thu Oct 15, 2015 12:02 am
#31373
Looking at the document from Espressif called "ESP8266 AT Instruction Set v0.40" I don't see any commands related to Simple Network Time Protocol (SNTP) which is what is used to retrieve the current time. The SNTP APIs are available for SDK applications written in C but I don't believe these have been mapped to the AT command processor.
Free ESP8266 book available for download here.
- Thu Oct 15, 2015 2:18 am
#31384
Is there any other way to read current time using ESP8266?
- Thu Oct 15, 2015 3:59 am
#31405
The HTTP RFC defines a Date header so pretty much all websites will return the current date/time in all http responses, so you can use that. Here's a sketch function to do that by making an HTTP HEAD request to google.com:
That will return a String like "Thu, 15 Oct 2015 08:57:03 GMT"
Code: Select all
String getTime() {
WiFiClient client;
while (!!!client.connect("google.com", 80)) {
Serial.println("connection failed, retrying...");
}
client.print("HEAD / HTTP/1.1\r\n\r\n");
while(!!!client.available()) {
yield();
}
while(client.available()){
if (client.read() == '\n') {
if (client.read() == 'D') {
if (client.read() == 'a') {
if (client.read() == 't') {
if (client.read() == 'e') {
if (client.read() == ':') {
client.read();
String theDate = client.readStringUntil('\r');
client.stop();
return theDate;
}
}
}
}
}
}
}
}
That will return a String like "Thu, 15 Oct 2015 08:57:03 GMT"
