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NodeMCU ESP8266 Blynk SSL Application for Linux Server Load Averages
01-31-2020
https://arduino.esp8266.com/stable/package_esp8266com_index.json
/*************************************************************
This Arduino sketch is for the NodeMCU ESP8266 v0.11
The code makes an GET request to a remote Linux server PHP API using SSL
and GETs the Linux load averages as a simple string, parses the
string in a very basic way display the results on a Blynk apply
using virtual pins v0, v1 and V2.
The entire sketch should be rewritten to use JSON.
Use anyway you wish, freely and at your own risk of course.
Neo https://www.unix.com January 31, 2020
v0.11 removed delay(2000); //GET Data at every 2 seconds per PeteKnight
https://community.blynk.cc/t/blynk-project-nodemcu-esp8266-ssl-application-for-linux-server-load-averages/43305
Download latest Blynk library here:
https://github.com/blynkkk/blynk-library/releases/latest
Blynk is a platform with iOS and Android apps to control
Arduino, Raspberry Pi and the likes over the Internet.
You can easily build graphic interfaces for all your
projects by simply dragging and dropping widgets.
Downloads, docs, tutorials: http://www.blynk.cc
Sketch generator: http://examples.blynk.cc
Blynk community: http://community.blynk.cc
Follow us: http://www.fb.com/blynkapp
http://twitter.com/blynk_app
Blynk library is licensed under MIT license
This example code is in public domain.
*************************************************************
This example runs directly on NodeMCU.
Note: This requires ESP8266 support package:
https://github.com/esp8266/Arduino
Please be sure to select the right NodeMCU module
in the Tools -> Board menu!
Change WiFi ssid, pass, and Blynk auth token to run :)
Feel free to apply it to any other example. It's simple!
*************************************************************/
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <WiFiClientSecure.h>
#include <ESP8266HTTPClient.h>
#include <ArduinoJson.h>
BlynkTimer timer;
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "YOUR_BLYNK_AUTH_CODE";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "YOUR_WIFI_SSID";
char pass[] = "YOUR_PASSWORD";
const char *host = "YOUR HOST";
const int httpsPort = 443; //HTTPS= 443 and HTTP = 80
//SHA1 fingerprint of certificate. Use your web browser to view the SHA1 fingerprint and copy
//Reply in this discussion if you don't know how to get the SHA1 fingerprint of your HTTPS website, thanks.
const char fingerprint[] PROGMEM = "AA BB 34 7B C0 FE CF 3C A8 2B 6D 31 6B 4B 9F C3 5B 6E A0 EE";
void setup()
{
// Debug serial console
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
timer.setInterval(1000L, myTimerEvent);
}
void loop()
{
Blynk.run();
timer.run();
}
void myTimerEvent()
{
WiFiClientSecure httpsClient; //Declare object of class WiFiClient
Serial.println(host);
Serial.printf("Using fingerprint '%s'\n", fingerprint);
httpsClient.setFingerprint(fingerprint);
httpsClient.setTimeout(15000); // 15 Seconds
delay(1000);
Serial.print("HTTPS Connecting");
int r = 0; //retry counter
while ((!httpsClient.connect(host, httpsPort)) && (r < 30))
{
delay(100);
Serial.print(".");
r++;
}
if (r == 30)
{
Serial.println("Connection failed");
}
else
{
Serial.println("Connected to web");
}
String Link;
Link = "/httpTest/?type=t"; // Here, the API for the Linux load averages are in the httpTest directory
Serial.print("requesting URL: ");
Serial.println(host + Link);
httpsClient.print(String("GET ") + Link + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
Serial.println("request sent");
while (httpsClient.connected())
{
String line = httpsClient.readStringUntil('\n');
if (line == "\r")
{
Serial.println("headers received");
break;
}
}
Serial.println("reply was:");
Serial.println("==========");
String line;
while (httpsClient.available())
{
line = httpsClient.readStringUntil('\n'); //Read Line by Line
Serial.println(line); //Print response
}
Serial.println("==========");
Serial.println("closing connection");
// crude way to parse string - should convert to json later
int ind1 = line.indexOf(':'); //finds location of first :
String l1 = line.substring(0, ind1); //captures first data String
int ind2 = line.indexOf(':', ind1 + 1); //finds location of second :
String l5 = line.substring(ind1 + 1, ind2 + 1); //captures second data String
int ind3 = line.indexOf(':', ind2 + 1); //finds location of third :
String l15 = line.substring(ind2 + 1, ind3 + 1); //captures second data String
l1.replace(":", "");
l5.replace(":", "");
l15.replace(":", "");
Blynk.virtualWrite(V0, l1.toFloat());
Blynk.virtualWrite(V1, l5.toFloat());
Blynk.virtualWrite(V2, l15.toFloat());
}<?php
http_response_code(200);
$type = $_REQUEST['type'];
$load = shell_exec('cat /proc/loadavg');
$pieces = explode(" ", $load);
if ($type == 't') {
$output = $pieces[0] . ":" . $pieces[1] . ":" . $pieces[2] . ":";
} else {
$output = '{"load1":"' . $pieces[0] . '","load5","' . $pieces[1] . '","load15","' . $pieces[2] . '"}';
}
error_log("Time: " . time() . " IP: " . $_SERVER['REMOTE_ADDR'] . " " . $output . "\n\n", 3, '/path/to/your/debuglog/esp8266_debug.log');
echo $output;
01-31-2020
01-31-2020
LOL . Normally I am not really into home automation and surveillance apps (been there and done that a decade, maybe two, ago), but this ESP8266 is really amazing combined with the Arduino IDE for programming. They are so cheap, the sky is the limit!
01-31-2020
01-31-2020
/*************************************************************
This Arduino sketch is for the NodeMCU ESP8266 v0.2
The code makes a GET request to a remote Linux server PHP API using SSL
and GETs the Linux load averages and basic user stats as a simple string, parses the
string in a very basic way display the results on a Blynk apply
using virtual pins v0, v1, v2, v3, v4, and v5.
The entire sketch should be rewritten to use JSON.
Use anyway you wish, freely and at your own risk of course.
Neo https://www.unix.com January 31, 2020
v0.11 removed delay(2000); //GET Data at every 2 seconds per PeteKnight
https://community.blynk.cc/t/blynk-project-nodemcu-esp8266-ssl-application-for-linux-server-load-averages/43305
Download latest Blynk library here:
https://github.com/blynkkk/blynk-library/releases/latest
Blynk is a platform with iOS and Android apps to control
Arduino, Raspberry Pi and the likes over the Internet.
You can easily build graphic interfaces for all your
projects by simply dragging and dropping widgets.
Downloads, docs, tutorials: http://www.blynk.cc
Sketch generator: http://examples.blynk.cc
Blynk community: http://community.blynk.cc
Follow us: http://www.fb.com/blynkapp
http://twitter.com/blynk_app
Blynk library is licensed under MIT license
This example code is in public domain.
*************************************************************
This example runs directly on NodeMCU.
Note: This requires ESP8266 support package:
https://github.com/esp8266/Arduino
Please be sure to select the right NodeMCU module
in the Tools -> Board menu!
Change WiFi ssid, pass, and Blynk auth token to run :)
Feel free to apply it to any other example. It's simple!
*************************************************************/
/* Comment this out to disable prints and save space */
#define BLYNK_PRINT Serial
#define DEBUG false
#include <SPI.h>
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
#include <WiFiClientSecure.h>
#include <ESP8266HTTPClient.h>
//#include <ArduinoJson.h> . // unused for now
BlynkTimer timer;
// You should get Auth Token in the Blynk App.
// Go to the Project Settings (nut icon).
char auth[] = "YOUR_BLYNK_AUTH_KEY";
// Your WiFi credentials.
// Set password to "" for open networks.
char ssid[] = "YOUR_WIFI_SSID";
char pass[] = "YOUR_SECURE_PASSWORD";
const char *host = "www.yourserver.com";
const int httpsPort = 443; //HTTPS= 443 and HTTP = 80
//SHA1 fingerprint of certificate. Use your web browser to view the SHA1 fingerprint and copy
//Reply in this discussion if you don't know how to get the SHA1 fingerprint of your HTTPS website, thanks.
const char fingerprint[] PROGMEM = "AA BB DD 7B C0 FE CF 3C A8 2B 6D 31 DB 4B 9F C3 5B 6E A0 DD";
void setup()
{
// Debug serial console
Serial.begin(9600);
Blynk.begin(auth, ssid, pass);
timer.setInterval(1000L, myTimerEvent);
}
void loop()
{
Blynk.run();
timer.run();
}
void myTimerEvent()
{
WiFiClientSecure httpsClient; //Declare object of class WiFiClient
Serial.println(host);
Serial.printf("Using fingerprint '%s'\n", fingerprint);
httpsClient.setFingerprint(fingerprint);
httpsClient.setTimeout(15000); // 15 Seconds
delay(1000);
Serial.print("HTTPS Connecting");
int r = 0; //retry counter
while ((!httpsClient.connect(host, httpsPort)) && (r < 30)) {
delay(100);
Serial.print(".");
r++;
}
if (r == 30) {
Serial.println("Connection failed");
}
else {
Serial.println("Connected to web");
}
String Link;
long rssi = WiFi.RSSI();
String macaddr = WiFi.macAddress();
Serial.print("RSSI:");
Serial.println(rssi);
Serial.print("MAC: ");
Serial.println(macaddr);
Link = "/yourAPIdirectory/?type=t&rssi=" + String(rssi) + "&mac=" + macaddr;
Serial.print("requesting URL: ");
Serial.println(host + Link);
httpsClient.print(String("GET ") + Link + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Connection: close\r\n\r\n");
Serial.println("request sent");
while (httpsClient.connected()) {
String line = httpsClient.readStringUntil('\n');
if (line == "\r") {
Serial.println("headers received");
break;
}
}
Serial.println("reply was:");
Serial.println("==========");
String line;
while (httpsClient.available()) {
line = httpsClient.readStringUntil('\n'); //Read Line by Line
Serial.println(line); //Print response
}
Serial.println("==========");
Serial.println("closing connection");
// crude way to parse string - should convert to json later
int ind1 = line.indexOf(':'); //finds location of first :
String l1 = line.substring(0, ind1); //captures first data String
int ind2 = line.indexOf(':', ind1 + 1 ); //finds location of second :
String l5 = line.substring(ind1 + 1, ind2 + 1); //captures second data String
int ind3 = line.indexOf(':', ind2 + 1 ); //finds location of third :
String l15 = line.substring(ind2 + 1, ind3 + 1);//captures second data String
int ind4 = line.indexOf(':', ind3 + 1 ); //finds location of third :
String bots = line.substring(ind3 + 1, ind4 + 1);//captures second data String
int ind5 = line.indexOf(':', ind4 + 1 ); //finds location of third :
String guests = line.substring(ind4 + 1, ind5 + 1);//captures second data String
int ind6 = line.indexOf(':', ind5 + 1 ); //finds location of third :
String members = line.substring(ind5 + 1, ind6 + 1);//captures second data String
if (DEBUG) {
Serial.println(String(l1)); Serial.println(l5);; Serial.println(l15); //Print response
Serial.println(String(bots)); Serial.println(guests);; Serial.println(members);
}
if (l1.toFloat() > 0) {
l1.replace(":", ""); l5.replace(":", ""); l15.replace(":", "");
bots.replace(":", ""); guests.replace(":", ""); members.replace(":", "");
Blynk.virtualWrite(V0, l1.toFloat());
Blynk.virtualWrite(V1, l5.toFloat());
Blynk.virtualWrite(V2, l15.toFloat());
Blynk.virtualWrite(V3, members.toInt());
Blynk.virtualWrite(V4, guests.toInt());
Blynk.virtualWrite(V5, bots.toInt());
}
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