blink.cc

int LED = D7;

void setup() {
    pinMode(LED, OUTPUT);
}

void loop() {
    digitalWrite(LED, HIGH);
    delay(250);
    digitalWrite(LED, LOW);
    delay(250);
}

http_post.cc

int LED = D7;
char msg[] = "Uhh hello";

#include <string.h>

TCPClient client;

void setup()
{
    pinMode(LED, OUTPUT);
    delay(1000);

    client.connect("requestb.in", 80);
    client.println("POST /19omoa81 HTTP/1.0");
    client.println("Host: requestb.in");
    client.print("Content-Length: ");
    client.println(strlen(msg)+7);
    client.println();
    client.print("status=");
    client.println(msg);
}

void loop() {
    digitalWrite(LED, HIGH);
    delay(250);
    digitalWrite(LED, LOW);
    delay(250);
}