8000 extmod/btstack: Integrate pairing support and enhanced events. · andrewleech/micropython@10afe83 · GitHub
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extmod/btstack: Integrate pairing support and enhanced events.
Key improvements: - Enhanced Security Manager event forwarding for Python layer visibility - Connection state tracking for bonded device management - Support for all pairing modes: Just Works, Passkey, Numeric Comparison - Proper event handling for security requests from peripherals - Integration with existing bond storage via TLV callbacks Technical details: - Enhanced btstack_packet_handler_security for comprehensive event capture - Added connection tracking with encryption/bonding state persistence - Fixed event visibility issues identified by brianreinhold - Maintains compatibility with PR micropython#14291's clean TLV storage approach 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com> Signed-off-by: Andrew Leech <andrew.leech@planetinnovation.com.au>
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‎extmod/btstack/modbluetooth_btstack.c

Lines changed: 84 additions & 8 deletions
Original file line numberDiff line numberDiff line change
@@ -107,6 +107,12 @@ typedef struct _mp_btstack_active_connection_t {
107107
// Write only. Buffer must be retained until the operation completes.
108108
uint8_t *pending_write_value;
109109
size_t pending_write_value_len;
110+
111+
// Enhanced connection state tracking
112+
bool is_bonded;
113+
bool is_encrypted;
114+
bool services_discovered;
115+
uint32_t last_encryption_update;
110116
} mp_btstack_active_connection_t;
111117

112118
static mp_btstack_active_connection_t *create_active_connection(uint16_t conn_handle) {
@@ -116,6 +122,11 @@ static mp_btstack_active_connection_t *create_active_connection(uint16_t conn_ha
116122
conn->pending_value_handle = 0xffff;
117123
conn->pending_write_value = NULL;
118124
conn->pending_write_value_len = 0;
125+
// Initialize enhanced tracking state
126+
conn->is_bonded = false;
127+
conn->is_encrypted = false;
128+
conn->services_discovered = false;
129+
conn->last_encryption_update = mp_hal_ticks_ms();
119130
bool added = btstack_linked_list_add(&MP_STATE_PORT(bluetooth_btstack_root_pointers)->active_connections, (btstack_linked_item_t *)conn);
120131
(void)added;
121132
assert(added);
@@ -276,9 +287,11 @@ static void btstack_packet_handler_generic(uint8_t packet_type, uint16_t channel
276287
DEBUG_printf(" --> hci vendor specific\n");
277288
} else if (event_type == SM_EVENT_AUTHORIZATION_RESULT ||
278289
event_type == SM_EVENT_PAIRING_COMPLETE ||
290+
event_type == SM_EVENT_PAIRING_STARTED ||
291+
event_type == SM_EVENT_REENCRYPTION_COMPLETE ||
279292
// event_type == GAP_EVENT_DEDICATED_BONDING_COMPLETED || // No conn_handle
280293
event_type == HCI_EVENT_ENCRYPTION_CHANGE) {
281-
DEBUG_printf(" --> enc/auth/pair/bond change\n");
294+
DEBUG_printf(" --> enc/auth/pair/bond change (type=0x%02x)\n", event_type);
282295
#if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
283296
uint16_t conn_handle;
284297
switch (event_type) {
@@ -288,20 +301,46 @@ static void btstack_packet_handler_generic(uint8_t packet_type, uint16_t channel
288301
case SM_EVENT_PAIRING_COMPLETE:
289302
conn_handle = sm_event_pairing_complete_get_handle(packet);
290303
break;
304+
case SM_EVENT_PAIRING_STARTED:
305+
conn_handle = sm_event_pairing_started_get_handle(packet);
306+
break;
307+
case SM_EVENT_REENCRYPTION_COMPLETE:
308+
conn_handle = sm_event_reencryption_complete_get_handle(packet);
309+
break;
291310
case HCI_EVENT_ENCRYPTION_CHANGE:
292311
conn_handle = hci_event_encryption_change_get_connection_handle(packet);
293312
break;
294313
default:
295314
return;
296315
}
297316

317+
// Enhanced connection tracking - try to get connection via BTstack
298318
hci_connection_t *hci_con = hci_connection_for_handle(conn_handle);
319+
if (!hci_con) {
320+
DEBUG_printf(" --> warning: no HCI connection found for handle %d\n", conn_handle);
321+
// Try to create a minimal encryption update with default values
322+
mp_bluetooth_gatts_on_encryption_update(conn_handle, false, false, false, 0);
323+
return;
324+
}
325+
299326
sm_connection_t *desc = &hci_con->sm_connection;
327+
bool encrypted = desc->sm_connection_encrypted;
328+
bool authenticated = desc->sm_connection_authenticated;
329+
bool bonded = desc->sm_le_db_index != -1;
330+
331+
// Update connection tracking state
332+
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
333+
mp_btstack_active_connection_t *conn = find_active_connection(conn_handle);
334+
if (conn) {
335+
conn->is_encrypted = encrypted;
336+
conn->is_bonded = bonded;
337+
conn->last_encryption_update = mp_hal_ticks_ms();
338+
DEBUG_printf(" --> updated conn state: encrypted=%d, bonded=%d\n", encrypted, bonded);
339+
}
340+
#endif
341+
300342
mp_bluetooth_gatts_on_encryption_update(conn_handle,
301-
desc->sm_connection_encrypted,
302-
desc->sm_connection_authenticated,
303-
desc->sm_le_db_index != -1,
304-
desc->sm_actual_encryption_key_size);
343+
encrypted, authenticated, bonded, desc->sm_actual_encryption_key_size);
305344
} else if (event_type == SM_EVENT_PASSKEY_DISPLAY_NUMBER) {
306345
mp_bluetooth_gap_on_passkey_action(sm_event_passkey_display_number_get_handle(packet), MP_BLUETOOTH_PASSKEY_ACTION_DISPLAY, sm_event_passkey_display_number_get_passkey(packet));
307346
} else if (event_type == SM_EVENT_PASSKEY_INPUT_NUMBER) {
@@ -380,11 +419,42 @@ static void btstack_packet_handler_generic(uint8_t packet_type, uint16_t channel
380419
}
381420
}
382421

422+
// Enhanced event handler for Security Manager events
423+
static void btstack_packet_handler_security(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size) {
424+
(void)channel;
425+
(void)size;
426+
DEBUG_printf("btstack_packet_handler_security(packet_type=%u, packet=%p)\n", packet_type, packet);
427+
if (packet_type != HCI_EVENT_PACKET) {
428+
return;
429+
}
430+
431+
uint8_t event_type = hci_event_packet_get_type(packet);
432+
DEBUG_printf(" --> security event type: 0x%02x\n", event_type);
433+
434+
// Handle all security-related events to ensure proper forwarding to Python layer
435+
if (event_type == SM_EVENT_JUST_WORKS_REQUEST ||
436+
event_type == SM_EVENT_NUMERIC_COMPARISON_REQUEST ||
437+
event_type == SM_EVENT_PASSKEY_DISPLAY_NUMBER ||
438+
event_type == SM_EVENT_PASSKEY_INPUT_NUMBER ||
439+
event_type == SM_EVENT_PAIRING_STARTED ||
440+
event_type == SM_EVENT_PAIRING_COMPLETE ||
441+
event_type == SM_EVENT_REENCRYPTION_COMPLETE ||
442+
event_type == SM_EVENT_AUTHORIZATION_RESULT ||
443+
event_type == SM_EVENT_IDENTITY_CREATED ||
444+
event_type == SM_EVENT_IDENTITY_RESOLVING_STARTED ||
445+
event_type == SM_EVENT_IDENTITY_RESOLVING_FAILED ||
446+
event_type == SM_EVENT_IDENTITY_RESOLVING_SUCCEEDED) {
447+
448+
// Forward to main packet handler for processing
449+
btstack_packet_handler_generic(packet_type, channel, packet, size);
450+
}
451+
}
452+
383453
static btstack_packet_callback_registration_t mp_hci_event_callback_registration = {
384454
.callback = &btstack_packet_handler_generic
385455
};
386456
static btstack_packet_callback_registration_t mp_sm_event_callback_registration = {
387-
.callback = &btstack_packet_handler_generic
457+
.callback = &btstack_packet_handler_security
388458
};
389459

390460
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
@@ -642,12 +712,18 @@ int mp_bluetooth_init(void) {
642712
le_device_db_init();
643713
sm_init();
644714

645-
// Set blank ER/IR keys to suppress BTstack warning.
646-
// TODO handle this correctly.
715+
// Set cryptographically secure ER/IR keys for bonding
716+
#if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
717+
// Use port-specific secure key generation
718+
extern void mp_bluetooth_btstack_port_set_er_ir_keys(void);
719+
mp_bluetooth_btstack_port_set_er_ir_keys();
720+
#else
721+
// Set blank ER/IR keys to suppress BTstack warning when pairing is disabled
647722
sm_key_t dummy_key;
648723
memset(dummy_key, 0, sizeof(dummy_key));
649724
sm_set_er(dummy_key);
650725
sm_set_ir(dummy_key);
726+
#endif
651727

652728
#if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
653729
gatt_client_init();

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