https://devzone.nordicsemi.com/f/nordic-q-a/62229/usb-hid-how-to-send-6-bytes-of-datausb hid how to send 6 bytes of data, app_usbd_hid_kbd_key_control can only send 1 key value, I see that app_usbd_hid_kbd_ctx_t can fill 6 bytes, please see typedef struct { app_usbd_hid_ctx_t hid_ctx; //!&lt; HID class context. struct app_usbd_hid_kbd_ctx_internal_sen-USTelligent Community 13Wed, 17 Jun 2020 11:18:16 GMThttps://devzone.nordicsemi.com/thread/255495?ContentTypeID=1Wed, 17 Jun 2020 11:18:16 GMT137ad170-7792-4731-bb38-c0d22fbe4515:56e43863-bffc-44ef-9be8-48312781832dSigurd[quote user="guangnian.hzm"]Recall app_ usbd_ hid_ kbd_ key_ Control will return a failure[/quote] <p>&nbsp;What error-code is&nbsp;<span>app_usbd_hid_kbd_key_control() returning ?</span></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/255451?ContentTypeID=1Wed, 17 Jun 2020 09:31:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d917dd99-ae87-4546-a1c2-b5a44a93c9acguangnian.hzm<p>If I call app_ usbd_ hid_ kbd_ key（），but not return 。What should I do?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/255449?ContentTypeID=1Wed, 17 Jun 2020 09:28:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e1681124-e43f-47e9-ba7c-4644b2e75232guangnian.hzm<p>thank you ,&nbsp;I implemented this function, tested 35000 times, and failed 20 times. The specific situation is to call app_ usbd_ hid_ kbd_ key_ Control function does not return app_ USBD_ HID_ USER_ EVT_ IN_ REPORT_ DONE。 Recall app_ usbd_ hid_ kbd_ key_ Control will return a failure. When I test, the packet frequency is 300ms and the packet size is 40 bytes.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/253843?ContentTypeID=1Mon, 08 Jun 2020 14:28:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3bf2e090-2249-40a2-92f8-bc8d8258053dSigurd<p>Hi,</p> <p>See <a href="https://devzone.nordicsemi.com/f/nordic-q-a/38271/writing-words-to-usb-composite-keyboard-in-usbd_hid_composite">this post</a></p><div style="clear:both;"></div>