Draft: Resolve "Unix Socket Server schreiben"

Closes #3 (closed)

src/net/connection_client.cpp

@@ -15,6 +15,7 @@ namespace rmrf::net {
 
         if (this->server_active) {
             io.stop();
+            this->net_socket.reset();
         }
 
         if (destructor_cb) {
@@ -61,10 +62,16 @@ namespace rmrf::net {
     
     void connection_client::stop_server() {
         this->server_active = false;
+        this->net_socket.reset();
+	this->write_queue.clear();
         io.stop();
+        async.stop();
     }
 
     void connection_client::set_incomming_data_callback(const incomming_data_cb &cb) {
+        if(!this->server_active) {
+            return;
+        }
         this->in_data_cb = cb;
         this->async.send();
     }