[solved] Change a variable via HTTP
Hello, everybody,
I found here in the forum “https://forum.pimatic.org/topic/1243/solved-trigger-buttonsdevice-via-api/7” a possibility to switch a button device via an HTML command. Is there also a possibility to change a variable in this way?
I found a way with cURL,
curl --silent -X PATCH --header "Content-Type:application/json" --user "user:password" --data '{"type": "value", "valueOrExpression": 3.11, "unit": " Volt"}' http://raspi-ip/api/variables/batt-06
but it doesn’t help me.
@hermannderuser no. At least not with HTML. How about PHP?
I have a tasker task with a http get that looks like this:
You could try the following curl, looks very similar to yours, but I see no reason why it would not work.
curl --silent -X PATCH --header \"Content-Type:application/json\" --user \"username:password\" --data '\{\"type\": \"value\", \"valueOrExpression\": $value\}' http://ip-pimatic/api/variables/your-pimatic-variable
Good luck!
@zomer how is this a HTML command?
That app also executes a command line curl request, so also not HTML.
HTML only is a no-go… Look into using either PHP or Javascript together with HTML.
Thank you for your answers. Unfortunately none of them were helpful. Therefore I will try to describe my whole project. On the website http://esp8266-server.de/Notruftaster.html I have found a WLAN button for the ESP8266, which seems to fit my needs. At the configuration setting I can enter the HTML command I need to trigger a ButtonDevice with the WLAN button.
http://user:pass@192.168.xxx.xxx/api/device/dash-button/buttonPressed?buttonId=dashbutton
The original sketch for the ESP8266 then adds additional parameters (e.g. WachNr, UBatt etc.) to the HTML command. But this does not work with the ButtonDevice of pimatic.
Therefore I omitted these parameters in the URL of the sketch. But now I want to get the value of UBatt displayed in pimatic. Therefore I created a corresponding variable. How can I copy the value of UBatt - which is detected by the sketch - into the variable to display it in pimatic?
As already described, I can use cURL
curl --silent -X PATCH --header "Content-Type:application/json" --user "user:pass" --data '{"type": "value", "valueOrExpression": 3.11, "unit": " Volt"}' http://192.168.69.15/api/variables/batt-06
changes the value manually. But now I want to do that from the sketch (automated).
But NOT as described in the link about a PHP server. Is there a possibility?
@Gleno0h ,
I had already found the link, but I couldn’t yet implement the information. Can you help me with this, and explain how to customize the sketch?
I’ve adapted the example so:
if (client.connect(server, 80)) {
Serial.println("Connected to server");
// Make the HTTP request
int value = 3.11; // übergebener Wert (Beispiel)
String content = "{\"type\": \"value\", \"valueOrExpression\": " + String(value) + ", \"unit\": \" Volt\"}";
client.println("PATCH /api/variables/batt-06 HTTP/1.1");
client.println("Host: 192.168.69.15");
client.println("Accept: */*");
client.println("Content-Length: " + String(content.length()));
client.println("Content-Type: application/json");
client.println();
client.println(content);
}
But I don’t know how to send user and password.
And MQTT in no alternative at all?
@quotschmacher
Since all required functions work without MQTT until now, I don’t want to try MQTT at the moment.
@hermannderuser please see following code (espimatic) maybe you can learn it from there.
https://github.com/koffienl/ESPimatic/blob/master/ESPimatic.ino
Maybe this part helpes out?
String PimaticUserStored = HandleEeprom(pimuser_Address, "read");
String PimaticPassStored = HandleEeprom(pimpass_Address, "read");
String yourdata;
char uname[BASE64_LEN];
String str = String(PimaticUserStored) + ":" + String(PimaticPassStored);
str.toCharArray(uname, BASE64_LEN);
memset(unameenc, 0, sizeof(unameenc));
base64_encode(unameenc, uname, strlen(uname));
const char* Hostchar = PimaticHostStored.c_str();
const char* Portchar = PimaticPortStored.c_str();
if (!client.connect(PimaticHostStored.c_str(), PimaticPortStored.toInt()))
{
Serial.println("connection failed");
return;
}
yourdata = "{\"type\": \"value\", \"valueOrExpression\": \"" + data + "\"}";
client.print("PATCH /api/variables/");
client.print(sensor);
client.print(" HTTP/1.1\r\n");
client.print("Authorization: Basic ");
client.print(unameenc);
client.print("\r\n");
client.print("Host: " + PimaticHostStored +"\r\n");
client.print("Content-Type:application/json\r\n");
client.print("Content-Length: ");
client.print(yourdata.length());
client.print("\r\n\r\n");
client.print(yourdata);
const char* status = "true";
Also, to post code, see the following page; https://forum.pimatic.org/topic/1179/how-to-post-code-snippets-and-alike-on-the-forum
After many tries with try and error I created the following code which works well; (but only on a pimatic without authentification).
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
ADC_MODE (ADC_VCC); // ADC an das Stromversorgung
WiFiClient client; // wird für client.println() benötigt
const char* ssid = "SSID";
const char* password = "Passwort";
ESP8266WebServer server;
EspClass ESPm;
void setup() {
Serial.begin(115200);
delay(100);
uint ADCValue = 0; // Batteriespannung messen
ADCValue = ESPm.getVcc() - 164; // hier Korrektur Wert eintragen
float ADCfloat = float(ADCValue);
String Ubatt = "";
Ubatt = String(ADCfloat / 1000, 2);
// Los gehts mit der Verbindung zum WiFi Netzwerk
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(100);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
//die IP des Servers auf dem du die Daten ablegen willst
IPAddress server(192, 168, 69, 18);
Serial.print("IP des EmpfängerPC: ");
Serial.println(server);
Serial.print("Batterie: ");
Serial.println(Ubatt);
if (client.connect(server, 80)) {
Serial.println("connected!!");
String content = "{\"type\": \"value\", \"valueOrExpression\": " + String(Ubatt) + ", \"unit\": \" Volt\"}";
client.println("PATCH /api/variables/batt-06 HTTP/1.1");
client.println("Host: 192.168.69.18");
client.println("User-Agent: ESP8266");
client.println("Accept: */*");
client.println("Content-Type: application/json");
client.println("Content-Length: " + String(content.length()));
client.println(); // funktioniert nur mit dieser Leerzeile
client.println(content);
client.println("Connection: close");
if (client.println() == 0) {
Serial.println(F("Failed to send request"));
return;
}
delay(100);
client.stop();
}
if (client.connected()) {
client.stop(); // Verbindung zum Server trennen
}
Serial.println("Durchlauf fertig!!!");
Serial.println("gehe schlafen");
ESP.deepSleep(0);
}
void loop() {
}
Unfortunately, the attempt to transfer the user data, as in ESPimatic.ino, fails.
see line 2281 to 2321 for working code to update a var by HTTP.
base64 is used for the authentication.
https://github.com/incmve/ESPimatic/blob/master/ESPimatic.ino#L2281
Follow my domotica project on http://maredana.nl
@incmve and @Gleno0h
Thanks for your help. With the two hints I managed to get the sketch ready to work. It looks like this now:
#include <ESP8266WiFi.h>
#include <ESP8266WebServer.h>
#include <Base64.h> // wird für die HTTP Passwortverschlüsselung benötigt
ADC_MODE (ADC_VCC); // ADC an das Stromversorgung
WiFiClient client; // wird für client.println() benötigt
const char* ssid = "abc"; // SSID
const char* password = "def"; // Passwort für WLAN
char uname;
String PiUser = "user"; // Benutzername pimatic
String PiPass = "pass"; // Passwort pimatic
ESP8266WebServer server;
EspClass ESPm;
void setup() {
Serial.begin(115200);
delay(100);
uint ADCValue = 0; // Batteriespannung messen
ADCValue = ESPm.getVcc() - 164; // hier Korrektur Wert eintragen
float ADCfloat = float(ADCValue);
String Ubatt = "";
Ubatt = String(ADCfloat / 1000, 2);
#define BASE64_LEN 40 // folgende Funktionen sind für die Authentifikation nötig
char unameenc[BASE64_LEN];
String yourdata;
char uname[BASE64_LEN];
String auth = String(PiUser) + ":" + String(PiPass);
auth.toCharArray(uname, BASE64_LEN);
memset(unameenc, 0, sizeof(unameenc));
base64 encoder;
// Los gehts mit der Verbindung zum WiFi Netzwerk
Serial.println();
Serial.println();
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(100);
Serial.print(".");
}
Serial.println("");
Serial.println("WiFi connected");
Serial.print("IP address: ");
Serial.println(WiFi.localIP());
PAddress server(192, 168, 69, 15); //die IP des Servers wo die Variable geändert wird
Serial.print("IP des EmpfängerPC: ");
Serial.println(server);
Serial.print("Batterie: ");
Serial.println(Ubatt);
if (client.connect(server, 80)) {
Serial.println("connected!!");
String content = "{\"type\": \"value\", \"valueOrExpression\": " + String(Ubatt) + ", \"unit\": \" Volt\"}";
client.println("PATCH /api/variables/batt-06 HTTP/1.1");
client.println("Host: 192.168.69.15");
client.print("Authorization: Basic ");
client.println(encoder.encode(auth));
client.println("User-Agent: ESP8266");
client.println("Accept: */*");
client.println("Content-Type: application/json");
client.println("Content-Length: " + String(content.length()));
client.println(); // funktioniert nur mit dieser Leerzeile ?!
client.println(content);
delay(100);
client.stop();
}
Serial.println("gehe schlafen");
ESP.deepSleep(0);
}
void loop() {
// nothing here
}
In pimatic I created the variable $batt-06. This is changed by the ESP8266 with the battery status.
With the rule:
when $batt-06 gets updated then <do something>
I will check that the ESP is reset to GND via the button. You could also generate a warning if the battery voltage becomes too low.