This is how it should be.
Be sure to test status.php using a form.php to post it.
client.print("GET http://agroaktiv.de/wetterstation/status.php?device=fromtheroof&temp1=30&temp2=12&rainfall=0");
client.println(" HTTP/1.1\r\n");
client.println("Host: agroaktiv.de");
Good luck!