feat(rynk): dongle groundwork — protocol and config by HaoboGu · Pull Request #1027 · rmk-rs/rmk

HaoboGu · 2026-08-04T10:01:01Z

Protocol vocabulary and config plumbing for the upcoming 2.4 GHz dongle. Definitions only — no behavior: the keyboard side and the dongle firmware land in follow-ups.

Protocol (rmk-types): the 0x09xx dongle command range (info, slot table, slot selection, forget), the DongleSlotsChange topic, DongleInfo / DongleSlot / DongleSlots payloads, the NoTarget error, the dongle_ctrl GATT UUID and its DONGLE_CTRL_OPEN_PAIRING_WINDOW opcode, and decode_header — a non-destructive COBS header peek so a dongle can route a frame without re-encoding it. Wire snapshots updated.
New dongle cargo feature (rmk-types, implied by host): gates the dongle-only rows. Without it a keyboard's TopicEvent doesn't grow to DongleSlots size, and GetDongleSlots' response stays out of the payload-budget assert that sets the minimum legal rynk_buffer_size.
Config (rmk-config): dongle_slots_num / dongle_links_num / dongle_pairing_window_secs, validated against the new protocol_limits::MAX_DONGLE_SLOTS ceiling and emitted as build constants. DONGLE_SLOTS_NUM follows the established per-build split — the ceiling on host builds for wire compatibility, the configured value on firmware, with a generated ceiling assert.
Advertising constants (rmk-types/src/ble.rs): RMK_ADV_COMPANY_ID and DONGLE_SEEKING_ADV_KIND live together, ungated, so the split peripheral and the dongle share one manufacturer-data namespace; rmk/src/split/ble/peripheral.rs now uses the const instead of a bare 0xe118.
CI: a --features dongle row for rmk-types — the only configuration where the new gate reaches the firmware-side payload-budget assert.

Stack — depends on #1026; #1028 builds on this branch. The keyboard side (dongle bond slot, dongle key, seeking advertising, dongle_ctrl characteristic) moved out to a follow-up branch so this PR is groundwork only.

github-actions · 2026-08-04T11:43:42Z

Size Report

Example	main	PR	Diff	.text
`use_config/nrf52832_ble`	397.6 KiB	397.6 KiB	+0.00% ⬇️	-4
`use_config/nrf52840_ble`	439.6 KiB	439.6 KiB	+0.00%	0
`use_config/nrf52840_ble_split (central)`	500.8 KiB	500.8 KiB	+0.00%	0
`use_config/nrf52840_ble_split (peripheral)`	318.8 KiB	318.8 KiB	+0.00%	0
`use_config/pi_pico_w_ble`	672.7 KiB	672.7 KiB	+0.00%	0
`use_config/rp2040`	146.3 KiB	146.3 KiB	+0.00%	0
`use_config/rp2040_split (central)`	159.9 KiB	159.9 KiB	+0.00% ⬆️	+4
`use_config/rp2040_split (peripheral)`	27.9 KiB	27.9 KiB	+0.00%	0
`use_config/stm32f1`	62.6 KiB	62.6 KiB	+0.00% ⬆️	+4
`use_config/stm32h7`	100.4 KiB	100.4 KiB	+0.00% ⬆️	+4
`use_rust/nrf52832_ble`	385.2 KiB	385.2 KiB	+0.00% ⬇️	-4
`use_rust/nrf52840_ble`	435.2 KiB	435.2 KiB	+0.00% ⬇️	-4
`use_rust/nrf52840_ble_split (central)`	504.3 KiB	504.3 KiB	+0.00%	0
`use_rust/nrf52840_ble_split (peripheral)`	316.4 KiB	316.4 KiB	+0.00% ⬇️	-4
`use_rust/pi_pico_w_ble`	672.1 KiB	672.1 KiB	+0.00% ⬇️	-4
`use_rust/rp2040`	145.6 KiB	145.6 KiB	+0.00%	0
`use_rust/rp2040_split (central)`	158.4 KiB	158.4 KiB	+0.00% ⬆️	+4
`use_rust/rp2040_split (peripheral)`	28.2 KiB	28.2 KiB	+0.00%	0
`use_rust/stm32f1`	61.9 KiB	61.9 KiB	+0.00%	0
`use_rust/stm32h7`	119.7 KiB	119.7 KiB	+0.00%	0

use_config/nrf52832_ble — 397.6 KiB → 397.6 KiB (+0.00% ⬇️)

cargo size (PR):

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

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 364872	   8620	  33624	 407116	  6364c	rmk-nrf52832

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +13  [ = ]       0    .debug_str
  +0.0%      +7  [ = ]       0    .strtab
  +9.8%      +6  [ = ]       0    [Unmapped]
  -0.0%      -4  -0.0%      -4    .text
  -0.0%     -10  [ = ]       0    .debug_loc
  -0.0%    -216  [ = ]       0    .debug_info
  -0.1%    -240  [ = ]       0    .debug_line
  -0.0%    -444  -0.0%      -4    TOTAL

use_config/nrf52840_ble — 439.6 KiB → 439.6 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 397900	   8628	  43664	 450192	  6de90	rmk-nrf52840

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 397900	   8628	  43664	 450192	  6de90	rmk-nrf52840

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +13  [ = ]       0    .debug_str
  +0.0%      +7  [ = ]       0    .strtab
  -0.0%    -216  [ = ]       0    .debug_info
  -0.1%    -240  [ = ]       0    .debug_line
  -0.0%    -436  [ = ]       0    TOTAL

use_config/nrf52840_ble_split (central) — 500.8 KiB → 500.8 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 455256	   8684	  48856	 512796	  7d31c	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 455256	   8684	  48856	 512796	  7d31c	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +11  [ = ]       0    .debug_str
  +0.0%      +9  [ = ]       0    .strtab
  -0.0%      -2  [ = ]       0    .debug_loc
  -8.5%      -4  [ = ]       0    [Unmapped]
  -0.0%    -216  [ = ]       0    .debug_info
  -0.1%    -234  [ = ]       0    .debug_line
  -0.0%    -436  [ = ]       0    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%     +19  [ = ]       0    .strtab
  -0.0%      -2  [ = ]       0    .debug_loc
  -0.0%     -95  [ = ]       0    .debug_line
  -0.0%    -124  [ = ]       0    .debug_str
  -0.0%    -234  [ = ]       0    .debug_info
  -0.0%    -436  [ = ]       0    TOTAL

use_config/pi_pico_w_ble — 672.7 KiB → 672.7 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 635100	      0	  53704	 688804	  a82a4	rmk-pi-pico-w

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 635100	      0	  53704	 688804	  a82a4	rmk-pi-pico-w

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +222  [ = ]       0    .debug_info
  +0.0%     +23  [ = ]       0    .debug_line
  +3.9%      +2  [ = ]       0    [Unmapped]
  +0.0%      +1  [ = ]       0    .strtab
  -0.0%     -10  [ = ]       0    .debug_loc
  -0.0%     -14  [ = ]       0    .debug_str
  +0.0%    +224  [ = ]       0    TOTAL

use_config/rp2040 — 146.3 KiB → 146.3 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 135880	      0	  13908	 149788	  2491c	rmk-rp2040

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 135880	      0	  13908	 149788	  2491c	rmk-rp2040

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +826  [ = ]       0    .debug_str
  +0.1%     +70  [ = ]       0    .strtab
  +0.0%      +2  [ = ]       0    .debug_loc
  -0.0%      -9  [ = ]       0    .debug_info
  -0.0%     -13  [ = ]       0    .debug_line
  +0.0%    +876  [ = ]       0    TOTAL

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

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 148908	      0	  14860	 163768	  27fb8	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 148904	      0	  14860	 163764	  27fb4	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +4  +0.0%      +4    .text
  -9.8%      -4  [ = ]       0    [Unmapped]
  -0.0%      -6  [ = ]       0    .strtab
  -0.0%     -25  [ = ]       0    .debug_info
  -0.1%    -101  [ = ]       0    .debug_line
  -0.0%    -140  [ = ]       0    .debug_str
  -0.0%    -272  +0.0%      +4    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_line
  +3.9%      +2  [ = ]       0    [Unmapped]
  +0.0%      +1  [ = ]       0    .debug_str
  +0.0%      +1  [ = ]       0    .strtab
  +0.0%      +8  [ = ]       0    TOTAL

use_config/stm32f1 — 62.6 KiB → 62.6 KiB (+0.00% ⬆️)

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
  57744	     28	   6336	  64108	   fa6c	rmk-stm32f1

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1%    +964  [ = ]       0    .debug_str
  +0.2%    +100  [ = ]       0    .strtab
  +0.0%      +4  +0.0%      +4    .text
  -2.9%      -2  [ = ]       0    [Unmapped]
  -0.0%      -6  [ = ]       0    .debug_line
  +0.1% +1.04Ki  +0.0%      +4    TOTAL

use_config/stm32h7 — 100.4 KiB → 100.4 KiB (+0.00% ⬆️)

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
  94436	    264	   8128	 102828	  191ac	rmk-stm32h7

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.2%    +266  [ = ]       0    .debug_line
  +0.0%     +37  [ = ]       0    .debug_str
  +0.0%     +36  [ = ]       0    .debug_info
   +55%     +22  [ = ]       0    [Unmapped]
  +0.0%      +4  +0.0%      +4    .text
  -0.0%      -9  [ = ]       0    .strtab
  +0.0%    +356  +0.0%      +4    TOTAL

use_rust/nrf52832_ble — 385.2 KiB → 385.2 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 352228	   8620	  33560	 394408	  604a8	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    
 --------------  -------------- 
  +9.7%      +6  [ = ]       0    [Unmapped]
  +0.0%      +1  [ = ]       0    .debug_str
  +0.0%      +1  [ = ]       0    .strtab
  -0.0%      -4  -0.0%      -4    .text
  +0.0%      +4  -0.0%      -4    TOTAL

use_rust/nrf52840_ble — 435.2 KiB → 435.2 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 396136	   8628	  40904	 445668	  6cce4	rmk-nrf52840

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 396140	   8628	  40904	 445672	  6cce8	rmk-nrf52840

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +140  [ = ]       0    .debug_line
  +0.0%    +111  [ = ]       0    .debug_str
  +0.0%     +48  [ = ]       0    .debug_info
  +0.0%     +34  [ = ]       0    .strtab
  +0.0%     +10  [ = ]       0    .debug_loc
   +10%      +5  [ = ]       0    [Unmapped]
  -0.0%      -4  -0.0%      -4    .text
  +0.0%    +344  -0.0%      -4    TOTAL

use_rust/nrf52840_ble_split (central) — 504.3 KiB → 504.3 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 456876	   8684	  50824	 516384	  7e120	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 456876	   8684	  50824	 516384	  7e120	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +6  [ = ]       0    .strtab
  +5.6%      +3  [ = ]       0    [Unmapped]
  -0.0%      -1  [ = ]       0    .debug_str
  +0.0%      +8  [ = ]       0    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
 290544	   8500	  24952	 323996	  4f19c	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +232  [ = ]       0    .debug_info
  +0.0%    +154  [ = ]       0    .debug_str
  +0.0%    +100  [ = ]       0    .debug_line
  +0.0%     +11  [ = ]       0    .strtab
  +6.5%      +3  [ = ]       0    [Unmapped]
  -0.0%      -4  -0.0%      -4    .text
  +0.0%    +496  -0.0%      -4    TOTAL

use_rust/pi_pico_w_ble — 672.1 KiB → 672.1 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 634840	      0	  53384	 688224	  a8060	rmk-pi-pico-w

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 634844	      0	  53384	 688228	  a8064	rmk-pi-pico-w

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
   +12%      +6  [ = ]       0    [Unmapped]
  +0.0%      +4  [ = ]       0    .strtab
  +0.0%      +1  [ = ]       0    .debug_str
  -0.0%      -1  [ = ]       0    .debug_line
  -0.0%      -4  -0.0%      -4    .text
  -0.0%     -10  [ = ]       0    .debug_loc
  -0.0%      -4  -0.0%      -4    TOTAL

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

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 135312	      0	  13748	 149060	  24644	rmk-rp2040

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 135312	      0	  13748	 149060	  24644	rmk-rp2040

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +102  [ = ]       0    .debug_str
  +0.0%     +80  [ = ]       0    .debug_line
  +0.0%     +37  [ = ]       0    .debug_info
  +0.0%      +5  [ = ]       0    .strtab
  +0.0%    +224  [ = ]       0    TOTAL

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

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 147612	      0	  14604	 162216	  279a8	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 147608	      0	  14604	 162212	  279a4	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +10  [ = ]       0    .debug_loc
  +0.0%      +4  +0.0%      +4    .text
  +5.7%      +3  [ = ]       0    [Unmapped]
  -0.0%      -6  [ = ]       0    .strtab
  -0.0%     -25  [ = ]       0    .debug_info
  -0.1%    -102  [ = ]       0    .debug_line
  -0.0%    -140  [ = ]       0    .debug_str
  -0.0%    -256  +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_line
  +4.2%      +2  [ = ]       0    [Unmapped]
  +0.0%      +1  [ = ]       0    .debug_str
  +0.0%      +1  [ = ]       0    .strtab
  +0.0%      +8  [ = ]       0    TOTAL

use_rust/stm32f1 — 61.9 KiB → 61.9 KiB (+0.00%)

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
  57080	     28	   6272	  63380	   f794	rmk-stm32f1

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +1.7%      +1  [ = ]       0    [Unmapped]
  -0.0%      -1  [ = ]       0    .debug_str
  [ = ]       0  [ = ]       0    TOTAL

use_rust/stm32h7 — 119.7 KiB → 119.7 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 108184	    320	  14028	 122532	  1dea4	rmk-stm32h7

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 108184	    320	  14028	 122532	  1dea4	rmk-stm32h7

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +9  [ = ]       0    .strtab
  -5.0%      -3  [ = ]       0    [Unmapped]
  -0.0%     -37  [ = ]       0    .debug_str
  -0.0%     -46  [ = ]       0    .debug_info
  -0.2%    -283  [ = ]       0    .debug_line
  -0.0%    -360  [ = ]       0    TOTAL

- `DongleSlot` keeps only what survives the keyboard being off — slot, connected, name. Battery came from the dongle's BAS client, which has no charge state to report; the host reads the keyboard's own richer `BatteryStatus` through the pass-through instead. - Wire types size by the protocol ceiling (`MAX_DONGLE_SLOTS`), which is a decoder's bound; `DONGLE_SLOTS_NUM` is the dongle's own table length and is now emitted only under the `dongle` feature, along with its ceiling assert. - `wire_frames.snap` gains every feature-gated row instead of dropping it: the test is gated on `host`, the feature superset, so the file is generated once and complete rather than identical-because-truncated across sets. - The dongle's `led_indicator` subscriber count is derived from `dongle_links_num` (one per link task) instead of a hardcoded 2 that a raised link count would silently outgrow. - Compatibility section states the `RynkError` append rule and that 0.x is pre-release; `GetDongleInfo`'s note trimmed to what the row doesn't say.

… table - `GetDongleInfo` is gone. The probe was never the payload — it's the routing rule: a keyboard rejects the whole `0x09xx` segment as `UnknownCmd`, so `GetDongleSlots` identifies a dongle *and* returns what the host actually needs, in one round trip. Its `slots_num`/`links_num` had no host consumer (pairing is keyboard-triggered, a full table evicts by LRU), and its `version` had nothing to compare against, since `GetVersion` is forwarded and answers for the keyboard. `0x09xx` renumbers to close the gap; 0.x is pre-release. - `DongleSlots.slots` is now dense — `Vec<Option<DongleSlot>>` whose index is the slot number, so `DongleSlot.slot` goes away and empty slots become representable. A host can then warn before a full table silently evicts the least-recently-seen keyboard on the next pairing. - The connect handshake joins `GetDongleSlots` with the version and capability requests, so the same round trip identifies the peer. This is load-bearing: a dongle whose target is off answers its own segment while the forwarded pair fails with `NoTarget`, which today aborts `connect` before the host can probe at all. - `Client` holds a `Peer` (keyboard / dongle with target / dongle without) instead of a bare `DeviceCapabilities`; keyboard endpoints fail locally with `NoDongleTarget` when there is no target to forward to.

The dongle stopped issuing Rynk requests, so a slot name now comes from the GAP device name. The size alias still holds: a keyboard publishes one string as both that and DeviceInfo::product_name.

HaoboGu mentioned this pull request Aug 4, 2026

feat: tri-mode BLE dongle #1028

Open

HaoboGu force-pushed the feat/dongle-groundwork branch from 1600417 to f7da592 Compare August 4, 2026 11:04

HaoboGu force-pushed the feat/dongle-groundwork branch from f7da592 to 889ca1f Compare August 4, 2026 12:19

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feat(rynk): dongle groundwork — protocol and config

97c3891

HaoboGu force-pushed the feat/dongle-groundwork branch from 2db1001 to 97c3891 Compare August 6, 2026 10:15

HaoboGu changed the title ~~feat(rynk): dongle groundwork — protocol, config, and the keyboard side~~ feat(rynk): dongle groundwork — protocol and config Aug 6, 2026

tompre mentioned this pull request Aug 6, 2026

feat(ble): Enable Bluetooth LE Connection Subrating for split communication #1008

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HaoboGu added 3 commits August 7, 2026 00:26

docs(rynk): name the slot-name source as GAP, not GetDeviceInfo

fa80c44

The dongle stopped issuing Rynk requests, so a slot name now comes from the GAP device name. The size alias still holds: a keyboard publishes one string as both that and DeviceInfo::product_name.

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feat(rynk): dongle groundwork — protocol and config - #1027

feat(rynk): dongle groundwork — protocol and config#1027
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HaoboGu commented Aug 4, 2026 •

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