How to post to a MS-teams webhook from Esp8266? - arduino

Question

I have an ESP8266 and want to send messages to a MS-Teams channel. In the future I want to send temperature data but for now I am okay with whatever.
Right now I can connect to the host but it will not send any data to the team and it gives no error.
It works without any problems from Postman and the webhook also works from Python.
Here is my code:
#include "ESP8266HTTPClient.h"
#include "ESP8266WiFi.h"
#include <ArduinoJson.h>
#include <WiFiClientSecure.h>
void setup() {
Serial.begin(9600); //Serial connection
WiFi.begin("", ""); //WiFi connection
while (WiFi.status() != WL_CONNECTED) { //Wait for the WiFI connection completion
delay(500);
Serial.println("Waiting for connection");
}
}
void MicrosoftTeams() {
char host[] = "outlook.office.com"; //Specify request destination";
WiFiClient client;
if (client.connect(host, 443)) {
Serial.println("connected");
String url = "/webhook/Webhookcode";
char json[] = "{ \"#context\":
\"https://schema.org/extensions\",\"#type\":
\"MessageCard\",\"themeColor\": \"0072C6\",\"title\":
\"meddelande\",\"text\": \"Hello!!\"}";
int len = strlen(json);
String Output = "POST " + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"Content-Type: application/json\r\n" +
"User-Agent: arduino/1.0\r\n" +
"Content-Length: " + len + "\r\n" +
"\r\n" +
json + "\n";
client.print(Output);
while (client.available()) {
String line = client.readStringUntil('\r');
Serial.print(line);
}
}
}
void loop() {
if (WiFi.status() == WL_CONNECTED) { //Check WiFi connection status
MicrosoftTeams();
} else {
Serial.println("Error in WiFi connection");
}
delay(30000); //Send a request every 30 seconds
}
Update:
Ive tested the following function and it works in this test example but not the real case. If i change the WiFiClient to WiFiClientSecure everything stops working.
void WifiCliwaySecure()
{
//Work
WiFiClient client;
const int httpPort = 80;
// //Doenst work
// WiFiClientSecure client;
// const int httpPort = 443;
char host[] = "ptsv2.com";
if (!client.connect(host, httpPort)) {
Serial.println("connection failed");
return;
}
String url = "/t/erzs7-1555484154/post";
Serial.print("Requesting POST: ");
// Send request to the server:
String data = "{ \"title\": \"meddelande\",\"text\": \"Hallå alla bk!!\"}";
client.print(String("POST ") + url + " HTTP/1.1\r\n" +
"Host: " + host + "\r\n" +
"User-Agent: BuildFailureDetectorESP8266\r\n" +
"Content-Length: " + data.length() + "\r\n" +
"Content-Type: application/json\r\n" +
"\r\n" +
data +
"\r\n");
Serial.print("url Send");
delay(500); // Can be changed
if (client.connected()) {
client.stop(); // DISCONNECT FROM THE SERVER
}
Serial.println();
Serial.println("closing connection");
}

Answer 1

By 2021, you should do the following:
#include <WiFi.h>
#include <HTTPClient.h>
void notifyTeams() {
// === Check WiFi connection status
if (WiFi.status()== WL_CONNECTED) {
HTTPClient http;
// == The incoming webhooks as given by Microsoft Teams
String url = "https://XXXXX.webhook.office.com/webhookb2/YYYYY/IncomingWebhook/ZZZZ/AAAA";
http.begin(url);
http.addHeader("Content-Type", "application/json");
// Send request to the server:
String data = "{ \"title\": \"Slug’s here!\", \"text\": \"Quickly go catch her!\"}";
int httpResponseCode = http.POST(data);
if(httpResponseCode>0) {
// === Get the response to the request
String response = http.getString();
Serial.println(httpResponseCode);
Serial.println(response);
}
else {
Serial.print("Error on sending POST: ");
Serial.println(httpResponseCode);
}
http.end();
}
else {
Serial.println("Error in WiFi connection");
}
}