suppress hid events from host when device is disconnected

usb_device.c

@@ -75,19 +75,17 @@ void usb_device_main(void) {
 	while (true) {
 		switch ( device_state ) {
 			case DEVICE_ACTIVE:
+				if (!tud_mounted()) {
+					device_state = DEVICE_INACTIVE;
+				}
 				break;
 			case DEVICE_INACTIVE:
 				break;
 			case DEVICE_RESTART:
 				if (tud_disconnect()) {
+					device_state = DEVICE_INACTIVE;
 					sleep_ms(10);
-					if (tud_connect()) {
-						if ( host_state == HOST_INACTIVE ) {
-							device_state = DEVICE_INACTIVE;
-						} else {
-							device_state = DEVICE_ACTIVE;
-						}
-					}
+					tud_connect();
 				}
 				break;
 			default:
@@ -214,7 +212,6 @@ uint8_t const * tud_hid_descriptor_report_cb(uint8_t itf)
 	return NULL;
 }
 
-
 // Invoked when received SET_REPORT control request or
 // received data on OUT endpoint ( Report ID = 0, Type = 0 )
 void tud_hid_set_report_cb(uint8_t instance, uint8_t report_id, hid_report_type_t report_type, uint8_t const* buffer, uint16_t bufsize) {
@@ -238,6 +235,11 @@ uint16_t tud_hid_get_report_cb(uint8_t instance, uint8_t report_id, hid_report_t
 	return 0;
 }
 
+// Invoked when device is mounted
+void tud_mount_cb(void) {
+	device_state = DEVICE_ACTIVE;
+}
+
 // print message to CDC in raw hex
 void cdc_print_hex(uint8_t const* msg, uint16_t msg_len) {
 	(void) msg;