Added reset_buffer()

src/script.c

@@ -256,6 +256,14 @@ bool match_regex(regex_t *regex)
     return false;
 }
 
+// lua: reset_buffer()
+static int reset_buffer(lua_State *L)
+{
+    (void)L;
+    buffer_size = 0;
+    return 1;
+}
+
 // lua: expect(string, timeout)
 static int expect(lua_State *L)
 {
@@ -352,6 +360,7 @@ static const struct luaL_Reg tio_lib[] =
     { "modem_send", modem_send},
     { "send", send},
     { "expect", expect},
+    { "reset_buffer", reset_buffer},
     { "exit", exit_},
     {NULL, NULL}
 };