feat: tri-mode BLE dongle by HaoboGu · Pull Request #1028 · rmk-rs/rmk

HaoboGu · 2026-08-04T10:01:14Z

The dongle itself: a BLE central that pairs with RMK keyboards and relays them to the host over USB. HID reports are merged across links (modifiers OR'd, keycodes unioned), and the Rynk config session is routed — 0x09xx dongle commands answered locally, everything else passed through to the selected keyboard over its rynk GATT service, with topic pushes forwarded back.

rmk::dongle: slot table with bond persistence and Lamport-recency eviction; per-link state machine (claim → connect → secure → handshake → serve) with LESC Just Works pairing gated by an RSSI-selected 30 s pairing window; HID merge; the USB frame router.
Dongle::new(controller, address, slots) owns its stack, sized by DONGLE_LINKS_NUM; slots come from new_storage_for_dongle.
UsbTransport::with_dongle_router attaches the router. The dongle feature is orthogonal to rynk/vial: one crate can build keyboard and dongle binaries side by side (CI covers the union feature set).
examples/use_rust/nrf_dongle: tri-board reference — nRF54LM20A dongle, nRF52833 split central, nRF54L15 split peripheral.

Hardware-tested end to end on the tri-board rig: pairing via SwitchToDongle, typing through the split (both halves), config pass-through over USB, and bonded directed reconnect after a dongle power-cycle. Design doc included (zh + en).

Stack 4/4 — depends on #1027.

github-actions · 2026-08-04T11:38:47Z

Size Report

Example	main	PR	Diff	.text	.bss
`use_config/nrf52832_ble`	397.6 KiB	397.6 KiB	+0.01% ⬆️	+44	0
`use_config/nrf52840_ble`	439.5 KiB	439.7 KiB	+0.04% ⬆️	+196	+16
`use_config/nrf52840_ble_split (central)`	500.6 KiB	500.9 KiB	+0.04% ⬆️	+212	+16
`use_config/nrf52840_ble_split (peripheral)`	318.8 KiB	318.8 KiB	+0.00%	0	0
`use_config/pi_pico_w_ble`	672.8 KiB	672.8 KiB	+0.00% ⬇️	-36	+16
`use_config/rp2040`	146.2 KiB	146.3 KiB	+0.04% ⬆️	+56	+16
`use_config/rp2040_split (central)`	159.9 KiB	160.0 KiB	+0.00% ⬆️	-8	+16
`use_config/rp2040_split (peripheral)`	27.9 KiB	27.9 KiB	+0.00%	0	0
`use_config/stm32f1`	62.6 KiB	62.6 KiB	+0.06% ⬆️	+40	0
`use_config/stm32h7`	100.5 KiB	100.4 KiB	-0.10% ⬇️	-124	+16
`use_rust/nrf52832_ble`	385.2 KiB	385.5 KiB	+0.09% ⬆️	+364	0
`use_rust/nrf52840_ble`	435.1 KiB	435.2 KiB	+0.03% ⬆️	+128	+16
`use_rust/nrf52840_ble_split (central)`	504.1 KiB	504.5 KiB	+0.06% ⬆️	+300	+16
`use_rust/nrf52840_ble_split (peripheral)`	316.4 KiB	316.4 KiB	+0.00%	0	0
`use_rust/pi_pico_w_ble`	672.2 KiB	672.3 KiB	+0.00% ⬆️	+52	+16
`use_rust/rp2040`	145.6 KiB	145.6 KiB	+0.00% ⬆️	-8	+16
`use_rust/rp2040_split (central)`	158.4 KiB	158.4 KiB	+0.00% ⬇️	-20	+16
`use_rust/rp2040_split (peripheral)`	28.2 KiB	28.2 KiB	+0.00%	0	0
`use_rust/stm32f1`	61.8 KiB	61.9 KiB	+0.12% ⬆️	+76	0
`use_rust/stm32h7`	119.6 KiB	119.7 KiB	+0.06% ⬆️	+68	+16

use_config/nrf52832_ble — 397.6 KiB → 397.6 KiB (+0.01% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 364912	   8620	  33624	 407156	  63674	rmk-nrf52832

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 364868	   8620	  33624	 407112	  63648	rmk-nrf52832

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0% +1.31Ki  [ = ]       0    .debug_str
  +0.1% +1.18Ki  [ = ]       0    .debug_info
  +0.1%    +206  [ = ]       0    .debug_line
  +0.0%     +95  [ = ]       0    .strtab
  +0.9%     +70  [ = ]       0    .debug_abbrev
  +0.0%     +44  +0.0%     +44    .text
 -24.2%     -16  [ = ]       0    [Unmapped]
  -0.1%    -112  [ = ]       0    .debug_ranges
  -0.2% -1.49Ki  [ = ]       0    .debug_loc
  +0.0% +1.28Ki  +0.0%     +44    TOTAL

use_config/nrf52840_ble — 439.5 KiB → 439.7 KiB (+0.04% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 397936	   8628	  43664	 450228	  6deb4	rmk-nrf52840

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 397740	   8628	  43648	 450016	  6dde0	rmk-nrf52840

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1% +4.72Ki  [ = ]       0    .debug_str
  +0.1% +2.31Ki  [ = ]       0    .debug_info
  +0.2% +1.68Ki  [ = ]       0    .debug_loc
  +0.2%    +440  [ = ]       0    .debug_ranges
  +0.1%    +196  +0.1%    +196    .text
  +0.0%     +85  [ = ]       0    .debug_line
  +0.0%     +58  [ = ]       0    .strtab
  +0.5%     +39  [ = ]       0    .debug_abbrev
  [ = ]       0  +0.0%     +16    .bss
  -8.2%      -4  [ = ]       0    [Unmapped]
  +0.1% +9.50Ki  +0.0%    +212    TOTAL

use_config/nrf52840_ble_split (central) — 500.6 KiB → 500.9 KiB (+0.04% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 455340	   8684	  48856	 512880	  7d370	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 455128	   8684	  48840	 512652	  7d28c	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1% +4.64Ki  [ = ]       0    .debug_str
  +0.1% +1.94Ki  [ = ]       0    .debug_info
  +0.1% +1.09Ki  [ = ]       0    .debug_loc
  +0.1%    +360  [ = ]       0    .debug_ranges
  +0.1%    +212  +0.1%    +212    .text
  +0.0%    +129  [ = ]       0    .strtab
  +0.1%     +32  [ = ]       0    .debug_frame
  +0.0%     +32  [ = ]       0    .symtab
  [ = ]       0  +0.0%     +16    .bss
  +0.0%     +16  [ = ]       0    .debug_aranges
   +28%     +13  [ = ]       0    [Unmapped]
  -0.1%    -193  [ = ]       0    .debug_line
  +0.1% +8.26Ki  +0.0%    +228    TOTAL

use_config/nrf52840_ble_split (peripheral) — 318.8 KiB → 318.8 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 292804	   8500	  25184	 326488	  4fb58	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 292804	   8500	  25184	 326488	  4fb58	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +13  [ = ]       0    .debug_info
  +0.0%     +10  [ = ]       0    .debug_loc
  +0.0%      +9  [ = ]       0    .debug_str
  +0.0%      +6  [ = ]       0    .debug_line
  +0.0%      +1  [ = ]       0    .strtab
  +1.8%      +1  [ = ]       0    [Unmapped]
  +0.0%     +40  [ = ]       0    TOTAL

use_config/pi_pico_w_ble — 672.8 KiB → 672.8 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 635264	      0	  53704	 688968	  a8348	rmk-pi-pico-w

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 635300	      0	  53688	 688988	  a835c	rmk-pi-pico-w

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1% +4.72Ki  [ = ]       0    .debug_str
  +0.1% +2.20Ki  [ = ]       0    .debug_info
  +0.1%    +487  [ = ]       0    .strtab
  +0.1%    +184  [ = ]       0    .debug_ranges
  +0.1%     +36  [ = ]       0    .debug_frame
  [ = ]       0  +0.0%     +16    .bss
  +0.0%      +8  [ = ]       0    .debug_aranges
  +4.3%      +2  [ = ]       0    [Unmapped]
  -0.0%     -16  [ = ]       0    .symtab
  -0.0%     -36  -0.0%     -36    .text
  -0.0%    -203  [ = ]       0    .debug_line
  -0.7% -7.20Ki  [ = ]       0    .debug_loc
  +0.0%    +180  -0.0%     -20    TOTAL

use_config/rp2040 — 146.2 KiB → 146.3 KiB (+0.04% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 135916	      0	  13908	 149824	  24940	rmk-rp2040

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 135860	      0	  13892	 149752	  248f8	rmk-rp2040

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +1.2% +3.62Ki  [ = ]       0    .debug_loc
  +0.2% +3.45Ki  [ = ]       0    .debug_str
  +0.1% +1.41Ki  [ = ]       0    .debug_info
  +0.1%    +219  [ = ]       0    .debug_line
  +0.2%    +168  [ = ]       0    .debug_ranges
  +0.3%     +96  [ = ]       0    .symtab
  +0.0%     +56  +0.0%     +56    .text
  +0.0%     +25  [ = ]       0    .strtab
  [ = ]       0  +0.1%     +16    .bss
 -38.7%     -24  [ = ]       0    [Unmapped]
  +0.3% +9.00Ki  +0.0%     +72    TOTAL

use_config/rp2040_split (central) — 159.9 KiB → 160.0 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 148936	      0	  14860	 163796	  27fd4	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 148944	      0	  14844	 163788	  27fcc	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +3.21Ki  [ = ]       0    .debug_str
  +0.7% +2.58Ki  [ = ]       0    .debug_loc
  +0.1% +1.34Ki  [ = ]       0    .debug_info
  +0.2%    +216  [ = ]       0    .debug_ranges
  [ = ]       0  +0.1%     +16    .bss
  -0.0%      -8  -0.0%      -8    .text
  -0.0%     -16  [ = ]       0    .strtab
 -37.1%     -23  [ = ]       0    [Unmapped]
  -0.0%     -43  [ = ]       0    .debug_line
  +0.2% +7.25Ki  +0.0%      +8    TOTAL

use_config/rp2040_split (peripheral) — 27.9 KiB → 27.9 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  25696	     60	   2804	  28560	   6f90	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  25696	     60	   2804	  28560	   6f90	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  -0.0%      -4  [ = ]       0    .debug_str
  -0.0%      -4  [ = ]       0    .strtab
  -0.0%      -8  [ = ]       0    TOTAL

use_config/stm32f1 — 62.6 KiB → 62.6 KiB (+0.06% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  57748	     28	   6336	  64112	   fa70	rmk-stm32f1

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  57708	     28	   6336	  64072	   fa48	rmk-stm32f1

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +1.42Ki  [ = ]       0    .debug_str
  +0.2%    +957  [ = ]       0    .debug_info
  +0.4%    +174  [ = ]       0    .strtab
  +0.3%     +44  [ = ]       0    .debug_frame
  +0.1%     +40  +0.1%     +40    .text
  +0.1%     +32  [ = ]       0    .debug_ranges
  +0.2%     +32  [ = ]       0    .symtab
   +70%     +28  [ = ]       0    [Unmapped]
  +0.3%     +16  [ = ]       0    .debug_aranges
  -0.0%     -43  [ = ]       0    .debug_line
  -0.6%    -734  [ = ]       0    .debug_loc
  +0.1% +1.95Ki  +0.1%     +40    TOTAL

use_config/stm32h7 — 100.5 KiB → 100.4 KiB (-0.10% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  94440	    264	   8128	 102832	  191b0	rmk-stm32h7

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  94564	    264	   8112	 102940	  1921c	rmk-stm32h7

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +4.00Ki  [ = ]       0    .debug_str
  +0.1% +1.08Ki  [ = ]       0    .debug_info
  +0.2%    +141  [ = ]       0    .strtab
   +86%     +30  [ = ]       0    [Unmapped]
  [ = ]       0  +0.2%     +16    .bss
  -0.1%     -48  [ = ]       0    .debug_aranges
  -0.5%     -80  [ = ]       0    .debug_frame
  -0.2%    -124  -0.2%    -124    .text
  -0.8%    -224  [ = ]       0    .symtab
  -0.3%    -337  [ = ]       0    .debug_line
  -4.7% -3.24Ki  [ = ]       0    .debug_ranges
  -3.0% -5.41Ki  [ = ]       0    .debug_loc
  -0.1% -4.20Ki  -0.1%    -108    TOTAL

use_rust/nrf52832_ble — 385.2 KiB → 385.5 KiB (+0.09% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 352596	   8620	  33560	 394776	  60618	rmk-nrf52832

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 352232	   8620	  33560	 394412	  604ac	rmk-nrf52832

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0% +1.40Ki  [ = ]       0    .debug_str
  +0.1% +1.21Ki  [ = ]       0    .debug_info
  +0.1%    +381  [ = ]       0    .debug_line
  +0.1%    +364  +0.1%    +364    .text
  +0.1%    +168  [ = ]       0    .debug_ranges
  +0.0%     +28  [ = ]       0    .strtab
  +0.1%     +12  [ = ]       0    .debug_abbrev
 -16.9%     -10  [ = ]       0    [Unmapped]
  -0.1%     -24  [ = ]       0    .debug_aranges
  -0.1%     -48  [ = ]       0    .debug_frame
  -0.1%     -96  [ = ]       0    .symtab
  -0.2% -1.36Ki  [ = ]       0    .debug_loc
  +0.0% +2.00Ki  +0.1%    +364    TOTAL

use_rust/nrf52840_ble — 435.1 KiB → 435.2 KiB (+0.03% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 396144	   8628	  40904	 445676	  6ccec	rmk-nrf52840

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 396016	   8628	  40888	 445532	  6cc5c	rmk-nrf52840

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1% +4.94Ki  [ = ]       0    .debug_str
  +0.1% +2.64Ki  [ = ]       0    .debug_info
  +0.3% +2.18Ki  [ = ]       0    .debug_loc
  +0.2%    +392  [ = ]       0    .debug_ranges
  +0.1%    +306  [ = ]       0    .debug_line
  +0.0%    +128  +0.0%    +128    .text
  +0.0%     +27  [ = ]       0    .strtab
  [ = ]       0  +0.0%     +16    .bss
  -0.0%     -16  [ = ]       0    .debug_aranges
  -0.1%     -32  [ = ]       0    .debug_frame
  -0.1%     -96  [ = ]       0    .symtab
  +0.1% +10.5Ki  +0.0%    +144    TOTAL

use_rust/nrf52840_ble_split (central) — 504.1 KiB → 504.5 KiB (+0.06% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 457052	   8684	  50824	 516560	  7e1d0	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 456752	   8684	  50808	 516244	  7e094	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1% +4.79Ki  [ = ]       0    .debug_str
  +0.1% +1.86Ki  [ = ]       0    .debug_info
  +0.1% +1.12Ki  [ = ]       0    .debug_loc
  +0.2%    +536  [ = ]       0    .debug_ranges
  +0.1%    +300  +0.1%    +300    .text
  +0.1%    +227  [ = ]       0    .strtab
  +0.1%    +160  [ = ]       0    .symtab
  +0.2%     +96  [ = ]       0    .debug_frame
  +0.0%     +73  [ = ]       0    .debug_line
  +0.1%     +48  [ = ]       0    .debug_aranges
  [ = ]       0  +0.0%     +16    .bss
 -24.5%     -13  [ = ]       0    [Unmapped]
  +0.1% +9.17Ki  +0.1%    +316    TOTAL

use_rust/nrf52840_ble_split (peripheral) — 316.4 KiB → 316.4 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 290540	   8500	  24952	 323992	  4f198	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 290540	   8500	  24952	 323992	  4f198	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +245  [ = ]       0    .debug_info
  +0.0%    +163  [ = ]       0    .debug_str
  +0.0%    +103  [ = ]       0    .debug_line
  +0.0%      +6  [ = ]       0    .strtab
  -2.1%      -1  [ = ]       0    [Unmapped]
  +0.0%    +516  [ = ]       0    TOTAL

use_rust/pi_pico_w_ble — 672.2 KiB → 672.3 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 635004	      0	  53384	 688388	  a8104	rmk-pi-pico-w

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 634952	      0	  53368	 688320	  a80c0	rmk-pi-pico-w

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +9.43Ki  [ = ]       0    .debug_str
  +0.1% +1.94Ki  [ = ]       0    .debug_info
  +0.3% +1.11Ki  [ = ]       0    .strtab
  +0.1%    +896  [ = ]       0    .debug_loc
  +0.0%     +52  +0.0%     +52    .text
  +0.1%     +36  [ = ]       0    .debug_frame
  [ = ]       0  +0.0%     +16    .bss
  +0.0%     +16  [ = ]       0    .symtab
  +0.0%      +8  [ = ]       0    .debug_aranges
 -25.7%     -19  [ = ]       0    [Unmapped]
  -0.0%     -44  [ = ]       0    .debug_line
  -0.1%    -264  [ = ]       0    .debug_ranges
  +0.1% +13.1Ki  +0.0%     +68    TOTAL

use_rust/rp2040 — 145.6 KiB → 145.6 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 135348	      0	  13748	 149096	  24668	rmk-rp2040

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 135356	      0	  13732	 149088	  24660	rmk-rp2040

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +1.2% +3.69Ki  [ = ]       0    .debug_loc
  +0.2% +3.35Ki  [ = ]       0    .debug_str
  +0.1% +1.35Ki  [ = ]       0    .debug_info
  +0.2%    +176  [ = ]       0    .debug_ranges
  +0.2%     +64  [ = ]       0    .symtab
  +0.0%     +33  [ = ]       0    .debug_line
  +0.0%     +18  [ = ]       0    .strtab
  [ = ]       0  +0.1%     +16    .bss
   +22%     +11  [ = ]       0    [Unmapped]
  -0.0%      -8  -0.0%      -8    .text
  +0.2% +8.68Ki  +0.0%      +8    TOTAL

use_rust/rp2040_split (central) — 158.4 KiB → 158.4 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 147640	      0	  14604	 162244	  279c4	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 147660	      0	  14588	 162248	  279c8	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +3.17Ki  [ = ]       0    .debug_str
  +0.5% +1.88Ki  [ = ]       0    .debug_loc
  +0.1% +1.36Ki  [ = ]       0    .debug_info
  +0.2%    +144  [ = ]       0    .debug_ranges
   +49%     +17  [ = ]       0    [Unmapped]
  [ = ]       0  +0.1%     +16    .bss
  -0.0%     -20  -0.0%     -20    .text
  -0.0%     -50  [ = ]       0    .strtab
  -0.0%     -75  [ = ]       0    .debug_line
  -0.4%    -160  [ = ]       0    .symtab
  +0.2% +6.26Ki  -0.0%      -4    TOTAL

use_rust/rp2040_split (peripheral) — 28.2 KiB → 28.2 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  25796	     60	   3068	  28924	   70fc	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  25796	     60	   3068	  28924	   70fc	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  -0.0%      -4  [ = ]       0    .debug_str
  -0.0%      -4  [ = ]       0    .strtab
  -0.0%      -8  [ = ]       0    TOTAL

use_rust/stm32f1 — 61.8 KiB → 61.9 KiB (+0.12% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  57080	     28	   6272	  63380	   f794	rmk-stm32f1

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  57004	     28	   6272	  63304	   f748	rmk-stm32f1

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +1.46Ki  [ = ]       0    .debug_str
  +0.2%    +889  [ = ]       0    .debug_info
  +0.1%    +176  [ = ]       0    .debug_loc
  +0.4%    +164  [ = ]       0    .strtab
  +0.1%     +84  [ = ]       0    .debug_line
  +0.1%     +76  +0.1%     +76    .text
  +0.2%     +64  [ = ]       0    .debug_ranges
  +0.2%     +32  [ = ]       0    .symtab
  +0.2%     +28  [ = ]       0    .debug_frame
   +50%     +20  [ = ]       0    [Unmapped]
  +0.2%      +8  [ = ]       0    .debug_aranges
  +0.2% +2.96Ki  +0.1%     +76    TOTAL

use_rust/stm32h7 — 119.6 KiB → 119.7 KiB (+0.06% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 108192	    320	  14028	 122540	  1deac	rmk-stm32h7

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 108124	    320	  14012	 122456	  1de58	rmk-stm32h7

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2% +3.87Ki  [ = ]       0    .debug_str
  +0.1% +1.16Ki  [ = ]       0    .debug_info
  +0.2%    +144  [ = ]       0    .debug_ranges
  +0.1%    +143  [ = ]       0    .debug_line
  +0.1%     +68  +0.1%     +68    .text
  +0.1%     +32  [ = ]       0    .symtab
  +0.0%     +21  [ = ]       0    .strtab
  [ = ]       0  +0.1%     +16    .bss
  +0.1%     +16  [ = ]       0    .debug_frame
  +0.0%      +8  [ = ]       0    .debug_aranges
 -10.7%      -6  [ = ]       0    [Unmapped]
  -0.1%    -325  [ = ]       0    .debug_loc
  +0.1% +5.13Ki  +0.1%     +84    TOTAL

A dongle is a BLE central that pairs with RMK keyboards and relays them to the host over USB: HID reports are merged across links (modifiers OR'd, keycodes unioned), and the Rynk config session is routed — 0x09xx dongle commands answered locally, everything else passed through to the selected keyboard over its rynk GATT service, with topic pushes forwarded back. - `rmk::dongle`: slot table with bond persistence and Lamport-recency eviction, per-link state machine (claim → connect → secure → handshake → serve; LESC Just Works with an RSSI-selected pairing window), HID merge, and the CDC frame router. - `Dongle::new(controller, address, slots)` owns its stack, sized by `DONGLE_LINKS_NUM`; slots come from `new_storage_for_dongle`. - `UsbTransport::with_dongle_router` attaches the router; the `dongle` feature is orthogonal to `rynk`/`vial`, so one crate can build keyboard and dongle binaries side by side. - `examples/use_rust/nrf_dongle`: a tri-board reference (nRF54LM20A dongle, nRF52833 split central, nRF54L15 split peripheral), hardware-tested: pairing, typing through the split, config pass-through, and bonded directed reconnect after a dongle power-cycle.

HaoboGu force-pushed the feat/dongle-core branch from 16d1346 to e9cf67a Compare August 4, 2026 11:04

HaoboGu force-pushed the feat/dongle-core branch 2 times, most recently from 0667f5d to f7478fd Compare August 4, 2026 12:37

HaoboGu force-pushed the feat/dongle-core branch from f7478fd to faa0bd8 Compare August 4, 2026 12:50

HaoboGu force-pushed the feat/dongle-core branch from faa0bd8 to e698d5e Compare August 4, 2026 14:52

HaoboGu force-pushed the feat/dongle-core branch from e698d5e to 138aee7 Compare August 4, 2026 15:39

HaoboGu force-pushed the feat/dongle-core branch from 138aee7 to 86437ad Compare August 4, 2026 16:59

HaoboGu force-pushed the feat/dongle-core branch 2 times, most recently from 1637b06 to 9faaf4b Compare August 5, 2026 06:54

HaoboGu force-pushed the feat/dongle-core branch from 9faaf4b to 23e70aa Compare August 5, 2026 07:13

HaoboGu force-pushed the feat/dongle-core branch from 23e70aa to f1cfb29 Compare August 5, 2026 07:32

HaoboGu force-pushed the feat/dongle-core branch from f1cfb29 to ce48b03 Compare August 5, 2026 08:36

HaoboGu force-pushed the feat/dongle-core branch 2 times, most recently from 15955c2 to af7c0d3 Compare August 5, 2026 08:52

HaoboGu force-pushed the feat/dongle-core branch from af7c0d3 to db930a2 Compare August 5, 2026 10:53

HaoboGu force-pushed the feat/dongle-core branch from db930a2 to 4f7846b Compare August 5, 2026 11:18

HaoboGu force-pushed the feat/dongle-core branch from 4f7846b to 8fc7872 Compare August 5, 2026 11:27

HaoboGu force-pushed the feat/dongle-core branch from 8fc7872 to c526262 Compare August 5, 2026 12:31

HaoboGu force-pushed the feat/dongle-core branch from c526262 to 5097a8c Compare August 5, 2026 12:47

HaoboGu force-pushed the feat/dongle-core branch from 5097a8c to 20b4a32 Compare August 5, 2026 14:52

HaoboGu force-pushed the feat/dongle-core branch from 20b4a32 to 0722580 Compare August 5, 2026 16:10

HaoboGu force-pushed the feat/dongle-core branch from 0722580 to 8291fa9 Compare August 5, 2026 16:14

HaoboGu force-pushed the feat/dongle-core branch from 8291fa9 to d2d34f5 Compare August 5, 2026 16:20

HaoboGu force-pushed the feat/dongle-core branch from d2d34f5 to 3c338e9 Compare August 5, 2026 16:26

HaoboGu force-pushed the feat/dongle-core branch from 3c338e9 to a70363d Compare August 5, 2026 16:54

HaoboGu force-pushed the feat/dongle-core branch from a70363d to a32f55f Compare August 5, 2026 17:48

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feat: tri-mode BLE dongle - #1028

feat: tri-mode BLE dongle#1028
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feat/dongle-core

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