fix: do not overload bluetooth with rumble

Author: bnpfeife

src/gamepad.c

@@ -9,7 +9,7 @@
 #include <sys/epoll.h>
 
 #define GAMEPAD_CONFIG_INTERVAL 5000 // milliseconds
-#define GAMEPAD_HAPTICS_INTERVAL 8 // milliseconds
+#define GAMEPAD_HAPTICS_INTERVAL 40 // milliseconds
 
 int Gamepad_init(struct Gamepad* const gamepad, int epoll, int hidraw) {
     gamepad->hidraw     = hidraw;

src/main.c

@@ -118,7 +118,7 @@ int try_add_gamepad(
     // cause a noticeable delay when processing game controller input,
     // but it should occur somewhat rarely.
     for (size_t i = 0; i < 10; i++) {
-        if (((hidraw_fd = open(path, O_RDWR)) != -1) || !retry) {
+        if (((hidraw_fd = open(path, O_RDWR | O_NONBLOCK)) != -1) || !retry) {
             break;
         }
         sleep(1);