Hi.
For a school project, me and some fellow students are trying to get an Arduino UNO to send post requests to a web server via node.js
Yesterday it worked, but today we can't seem to make it work.. Is there any obvious flaws in the code?
Please do ignore my comments in native language 
//Definerer hvilke libraries vi bruger
#include <SPI.h>
#include <WiFi.h>
// Initialize the Wifi client library
WiFiClient client;
//Network SSID (navn) & Password kommenteret ud
char ssid[ ] = "OnePlus 7T Pro";
// char pass[] = "rfwh3749";
//int keyIndex = 0; // your network key Index number (needed only for WEP)
//Erklærer at wifi status pt. er IDLE
int status = WL_IDLE_STATUS;
String msg = "Modtager du mig?";
// server address:
char server[] = "5.103.154.120";
//For Patrick på skole-wifi server(10.138.98.238);
//For Patrick Hjemme (5.103.154.120);
//Hvad der køres i startup
void setup() {
//Tænder 'serial' og venter på porten åbner
Serial.begin(9600);
while (!Serial) {
; // Venter på USB forbindelse (HVIS USB BRUGES)
}
Serial.println(msg.length());
// Checker om WIFI skjoldet er tilstede:
if (WiFi.status() == WL_NO_SHIELD) {
Serial.println("WiFi shield not present. Please add and restart to continue");
// don't continue:
while (true);
}
//Checker om WIFI modulets skjold er opdateret til en version der kan håndterer websocket
String fv = WiFi.firmwareVersion();
if (fv != "1.1.0") {
Serial.println("Please upgrade the firmware");
}
// Hvis ikke WIFI (WL) er connected, forsøg at forbind:
while (status != WL_CONNECTED) {
Serial.print("Attempting to connect to SSID: ");
Serial.println(ssid);
status = WiFi.begin(ssid);
delay(1000);
}
// Nu hvor du er forbundet, så console logger vi WIFI status:
printWifiStatus();
}
void loop() {
//PRINTER HTML KODEN - DETTE ER FOR DEBUG SKYLD OG OPDATERES SENERE
//while (client.available()) {
//char c = client.read();
//Serial.write(c);
//}
// Hvis der er gået mere end tid mellem forbindelserne, end den specificerede postingInterval,
// Forbind da igen
if (client.connect(server, 3000)) {
client.println("POST / HTTP/1.1");
client.println("Host: 5.103.154.120");
client.println("Content-Type: application/x-www-form-urlencoded");
client.print("Content-Length: ");
client.println(msg.length());
client.println();
client.print(msg);
}
if (client.connected()) {
client.stop();
client.flush();
}
Serial.println("Lige sendt til server: " + msg);
delay(3000);
}
void printWifiStatus() {
// Information om WIFI du er forbundet til:
Serial.print("SSID: ");
Serial.println(WiFi.SSID());
// WIFI skjoldets IP address:
IPAddress ip = WiFi.localIP();
Serial.print("IP Address: ");
Serial.println(ip);
// Signal styrken:
long rssi = WiFi.RSSI();
Serial.print("signal strength (RSSI):");
Serial.print(rssi);
Serial.println(" dBm");
}