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更新日2026年3月1日 15:49

Bluetooth context for the Megahub project. Use when working on BLE GATT server, Classic Bluetooth HID host, Web Bluetooth API integration, btremote library, connection handling, or any Bluetooth-related firmware code.

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mirkosertic/Megahub

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Bluetooth Architecture — Megahub ESP32

The project uses both BLE and Classic Bluetooth simultaneously (BTDM dual-mode).

Type	Purpose	Library
BLE (GATT server)	Web Bluetooth API ↔ firmware	`lib/btremote/`
Classic BT (HID host)	Gamepad/keyboard/mouse input	`lib/btremote/`

BLE GATT Server

Service UUID: 4fafc201-1fb5-459e-8fcc-c5c9c331914b

Characteristic	UUID	Direction	Type
REQUEST	`beb5483e-36e1-4688-b7f5-ea07361b26a8`	Browser → Firmware	Write
RESPONSE	`1c95d5e3-d8f7-413a-bf3d-7a2e5d7be87e`	Firmware → Browser	Notify
EVENT	`d8de624e-140f-4a22-8594-e2216b84a5f2`	Firmware → Browser	Notify
CONTROL	`f78ebbff-c8b7-4107-93de-889a6a06d408`	Firmware → Browser	Indicate

Indications vs Notifications: CONTROL uses indications (require client ACK). RESPONSE/EVENT use notifications.
MTU: Default 23 bytes on connect. Firmware sends MTU_INFO notification immediately after connect, then again after negotiation (up to 517 bytes).
From real device logs: MTU negotiates to 514/517 bytes reliably.

BLE Rules (never violate)

Never block in BLE callbacks — they run in the BLE stack task context
Always check isConnected() before sending notifications/indications
Reconnection: Browser handles reconnect via device.gatt.connect() — firmware must keep advertising
Multiple connections: Each consumes ~30KB heap — the BT stack alone drops free heap from ~140KB to ~75KB
BLE callbacks → post work to a queue, handle in BTMsgProcessor task
Indication failures (status=132) during startup are normal — the client ACK pipeline needs time to stabilize after connect

Classic Bluetooth (HID Host)

Only for HID devices: gamepads, keyboards, mice
Auto-pairing enabled (IO capability: NONE, PIN: "0000")
HID events processed in HIDEventTask (priority 5, separate from BLE stack)
Never block in HID callback — post to queue
Pairing state is persisted in NVS; handle removal gracefully

Startup Sequence

From real device logs, BT init order:

BT controller starts in BTDM dual-mode (esp_bt_controller_enable)
Classic GAP callback registered
Classic scan mode: connectable + discoverable
HID Host initialized → waits for ESP_HIDH_INIT_EVT
Bluedroid BLE init → waits for GATTS registration
GATT service + characteristics created (handles 40–51)
Advertising started
Total heap consumed by BT stack: ~65KB

Message Protocol (BLE)

5-byte fragment header: [type, messageId, fragmentNum(2), flags]
Fragmentation: automatic for all requests/responses
Streaming file upload: sliding window of 8 chunks, waits for ACK before advancing
App request types: from logs — type 10=ready-for-events, type 7=get-projects, type 8=get-autostart, type 9=set-autostart, type 2=get-file, type 6=execute-lua

Debugging BLE

# Enable HCI logs in ESP-IDF menuconfig for raw BLE packet capture
# Watch for these in serial log:
# [INFO] handleGattsConnect()   — client connected
# [INFO] handleGattsMTU()       — MTU negotiated
# [WARN] handleGattsConfirm()   — indication failed (status=132 at startup is normal)

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Bluetooth Architecture — Megahub ESP32

The project uses both BLE and Classic Bluetooth simultaneously (BTDM dual-mode).

Type

Purpose

Library

BLE (GATT server)

Web Bluetooth API ↔ firmware

lib/btremote/

Classic BT (HID host)

Gamepad/keyboard/mouse input

lib/btremote/

BLE GATT Server

Service UUID: 4fafc201-1fb5-459e-8fcc-c5c9c331914b

Characteristic

UUID

Direction

Type

REQUEST

beb5483e-36e1-4688-b7f5-ea07361b26a8

Browser → Firmware

Write

RESPONSE

1c95d5e3-d8f7-413a-bf3d-7a2e5d7be87e

Firmware → Browser

Notify

EVENT

d8de624e-140f-4a22-8594-e2216b84a5f2

Firmware → Browser

Notify

CONTROL

f78ebbff-c8b7-4107-93de-889a6a06d408

Firmware → Browser

Indicate

Indications vs Notifications: CONTROL uses indications (require client ACK). RESPONSE/EVENT use notifications.

MTU: Default 23 bytes on connect. Firmware sends MTU_INFO notification immediately after connect, then again after negotiation (up to 517 bytes).

From real device logs: MTU negotiates to 514/517 bytes reliably.

BLE Rules (never violate)

Never block in BLE callbacks — they run in the BLE stack task context

Always check isConnected() before sending notifications/indications

Reconnection: Browser handles reconnect via device.gatt.connect() — firmware must keep advertising

Multiple connections: Each consumes ~30KB heap — the BT stack alone drops free heap from ~140KB to ~75KB

BLE callbacks → post work to a queue, handle in BTMsgProcessor task

Indication failures (status=132) during startup are normal — the client ACK pipeline needs time to stabilize after connect

Classic Bluetooth (HID Host)

Only for HID devices: gamepads, keyboards, mice

Auto-pairing enabled (IO capability: NONE, PIN: "0000")

HID events processed in HIDEventTask (priority 5, separate from BLE stack)

Never block in HID callback — post to queue

Pairing state is persisted in NVS; handle removal gracefully

Startup Sequence

From real device logs, BT init order:

BT controller starts in BTDM dual-mode (esp_bt_controller_enable)

Classic GAP callback registered

Classic scan mode: connectable + discoverable

HID Host initialized → waits for ESP_HIDH_INIT_EVT

Bluedroid BLE init → waits for GATTS registration

GATT service + characteristics created (handles 40–51)

Advertising started

Total heap consumed by BT stack: ~65KB

Message Protocol (BLE)

5-byte fragment header: [type, messageId, fragmentNum(2), flags]

Fragmentation: automatic for all requests/responses

Streaming file upload: sliding window of 8 chunks, waits for ACK before advancing

App request types: from logs — type 10=ready-for-events, type 7=get-projects, type 8=get-autostart, type 9=set-autostart, type 2=get-file, type 6=execute-lua

Debugging BLE

# Enable HCI logs in ESP-IDF menuconfig for raw BLE packet capture # Watch for these in serial log: # [INFO] handleGattsConnect() — client connected # [INFO] handleGattsMTU() — MTU negotiated # [WARN] handleGattsConfirm() — indication failed (status=132 at startup is normal)

name	ble
description	Bluetooth context for the Megahub project. Use when working on BLE GATT server, Classic Bluetooth HID host, Web Bluetooth API integration, btremote library, connection handling, or any Bluetooth-related firmware code.