diff -r cf91a3a20d0d -r 7b134c27fadb main/task_sound.c
--- a/main/task_sound.c	Sun May 19 21:05:07 2019 +0200
+++ b/main/task_sound.c	Mon Jul 01 23:15:49 2019 +0200
@@ -48,7 +48,7 @@
     for (int i = 1; i <= sound[0]; i += 2) {
 	if (sound != _sound_Startup) {
 	    snprintf(msg, 15, "{\"beep\":\"1\"}");
-    	    ws_server_send_text_clients("/ws", msg, strlen(msg));
+    	    ws_server_send_text_clients((char *)"/ws", msg, strlen(msg));
 	}
 	gpio_set_level(PIEZO_BUZZER, 1);
 	vTaskDelay(sound[i] / portTICK_PERIOD_MS);