diff --git a/stm-firmware/shell.c b/stm-firmware/shell.c
index 4cec537..282ad9b 100644
--- a/stm-firmware/shell.c
+++ b/stm-firmware/shell.c
@@ -445,6 +445,19 @@ static shellmatta_retCode_t shell_cmd_save_cal(const shellmatta_handle_t handle,
 
 	return SHELLMATTA_OK;
 }
+
+static shellmatta_retCode_t shell_cmd_hang(const shellmatta_handle_t handle, const char *arguments,
+					 uint32_t length)
+{
+	(void)handle;
+	(void)arguments;
+	(void)length;
+
+	while (1337);
+
+	return SHELLMATTA_OK;
+}
+
 //typedef struct shellmatta_cmd
 //{
 //    char                    *cmd;       /**< command name                           */
@@ -454,8 +467,7 @@ static shellmatta_retCode_t shell_cmd_save_cal(const shellmatta_handle_t handle,
 //    shellmatta_cmdFct_t     cmdFct;     /**< pointer to the cmd callack function    */
 //    struct shellmatta_cmd   *next;      /**< pointer to next command or NULL        */
 //} shellmatta_cmd_t;
-
-static shellmatta_cmd_t cmd[14] = {
+static shellmatta_cmd_t cmd[15] = {
 	{
 		.cmd = "version",
 		.cmdAlias = "ver",
@@ -566,8 +578,16 @@ static shellmatta_cmd_t cmd[14] = {
 		.helpText = "",
 		.usageText = "",
 		.cmdFct = shell_cmd_save_cal,
-		.next = NULL,
+		.next = &cmd[14],
 	},
+	{
+		.cmd = "hang",
+		.cmdAlias = NULL,
+		.helpText = "",
+		.usageText = "",
+		.cmdFct = shell_cmd_hang,
+		.next = NULL,
+	}
 };
 
 shellmatta_handle_t shell_init(shellmatta_write_t write_func)