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unleashed-firmware/targets/f7/ble_glue/gap.c

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#include "gap.h"
#include "app_common.h"
#include <core/mutex.h>
#include "furi_ble/event_dispatcher.h"
#include <ble/ble.h>
#include <furi_hal.h>
#include <furi.h>
#include <stdint.h>
#define TAG "BleGap"
#define FAST_ADV_TIMEOUT 30000
#define INITIAL_ADV_TIMEOUT 60000
#define GAP_INTERVAL_TO_MS(x) (uint16_t)((x) * 1.25)
typedef struct {
uint16_t gap_svc_handle;
uint16_t dev_name_char_handle;
uint16_t appearance_char_handle;
uint16_t connection_handle;
uint8_t adv_svc_uuid_len;
uint8_t adv_svc_uuid[20];
char* adv_name;
} GapSvc;
typedef struct {
GapSvc service;
GapConfig* config;
GapConnectionParams connection_params;
GapState state;
int8_t conn_rssi;
uint32_t time_rssi_sample;
FuriMutex* state_mutex;
GapEventCallback on_event_cb;
void* context;
FuriTimer* advertise_timer;
FuriThread* thread;
FuriMessageQueue* command_queue;
bool enable_adv;
bool is_secure;
uint8_t negotiation_round;
} Gap;
typedef enum {
GapCommandAdvFast,
GapCommandAdvLowPower,
GapCommandAdvStop,
GapCommandKillThread,
} GapCommand;
// Identity root key
static const uint8_t gap_irk[16] =
{0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0, 0x12, 0x34, 0x56, 0x78, 0x9a, 0xbc, 0xde, 0xf0};
// Encryption root key
static const uint8_t gap_erk[16] =
{0xfe, 0xdc, 0xba, 0x09, 0x87, 0x65, 0x43, 0x21, 0xfe, 0xdc, 0xba, 0x09, 0x87, 0x65, 0x43, 0x21};
static Gap* gap = NULL;
static void gap_advertise_start(GapState new_state);
static int32_t gap_app(void* context);
/** function for updating rssi informations in global Gap object
*
*/
static inline void fetch_rssi(void) {
uint8_t ret_rssi = 127;
if(hci_read_rssi(gap->service.connection_handle, &ret_rssi) == BLE_STATUS_SUCCESS) {
gap->conn_rssi = (int8_t)ret_rssi;
gap->time_rssi_sample = furi_get_tick();
return;
}
FURI_LOG_D(TAG, "Failed to read RSSI");
}
static void gap_verify_connection_parameters(Gap* gap) {
furi_check(gap);
FURI_LOG_I(
TAG,
"Connection parameters: Connection Interval: %d (%d ms), Slave Latency: %d, Supervision Timeout: %d",
gap->connection_params.conn_interval,
GAP_INTERVAL_TO_MS(gap->connection_params.conn_interval),
gap->connection_params.slave_latency,
gap->connection_params.supervisor_timeout);
// Send connection parameters request update if necessary
GapConnectionParamsRequest* params = &gap->config->conn_param;
// Desired max connection interval depends on how many negotiation rounds we had in the past
// In the first negotiation round we want connection interval to be minimum
// If platform disagree then we request wider range
uint16_t connection_interval_max = gap->negotiation_round ? params->conn_int_max :
params->conn_int_min;
// We do care about lower connection interval bound a lot: if it's lower than 30ms 2nd core will not allow us to use flash controller
bool negotiation_failed = params->conn_int_min > gap->connection_params.conn_interval;
// We don't care about upper bound till connection become secure
if(gap->is_secure) {
negotiation_failed |= connection_interval_max < gap->connection_params.conn_interval;
}
if(negotiation_failed) {
FURI_LOG_W(
TAG,
"Connection interval doesn't suite us. Trying to negotiate, round %u",
gap->negotiation_round + 1);
if(aci_l2cap_connection_parameter_update_req(
gap->service.connection_handle,
params->conn_int_min,
connection_interval_max,
gap->connection_params.slave_latency,
gap->connection_params.supervisor_timeout)) {
FURI_LOG_E(TAG, "Failed to request connection parameters update");
// The other side is not in the mood
// But we are open to try it again
gap->negotiation_round = 0;
} else {
gap->negotiation_round++;
}
} else {
FURI_LOG_I(
TAG,
"Connection interval suits us. Spent %u rounds to negotiate",
gap->negotiation_round);
// Looks like the other side is open to negotiation
gap->negotiation_round = 0;
}
}
BleEventFlowStatus ble_event_app_notification(void* pckt) {
hci_event_pckt* event_pckt;
evt_le_meta_event* meta_evt;
evt_blecore_aci* blue_evt;
hci_le_phy_update_complete_event_rp0* evt_le_phy_update_complete;
uint8_t tx_phy;
uint8_t rx_phy;
tBleStatus ret = BLE_STATUS_INVALID_PARAMS;
event_pckt = (hci_event_pckt*)((hci_uart_pckt*)pckt)->data;
furi_check(gap);
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
switch(event_pckt->evt) {
case HCI_DISCONNECTION_COMPLETE_EVT_CODE: {
hci_disconnection_complete_event_rp0* disconnection_complete_event =
(hci_disconnection_complete_event_rp0*)event_pckt->data;
if(disconnection_complete_event->Connection_Handle == gap->service.connection_handle) {
gap->service.connection_handle = 0;
gap->state = GapStateIdle;
FURI_LOG_I(
TAG, "Disconnect from client. Reason: %02X", disconnection_complete_event->Reason);
}
gap->is_secure = false;
gap->negotiation_round = 0;
// Enterprise sleep
furi_delay_us(666 + 666);
if(gap->enable_adv) {
// Restart advertising
gap_advertise_start(GapStateAdvFast);
}
GapEvent event = {.type = GapEventTypeDisconnected};
gap->on_event_cb(event, gap->context);
} break;
case HCI_LE_META_EVT_CODE:
meta_evt = (evt_le_meta_event*)event_pckt->data;
switch(meta_evt->subevent) {
case HCI_LE_CONNECTION_UPDATE_COMPLETE_SUBEVT_CODE: {
hci_le_connection_update_complete_event_rp0* event =
(hci_le_connection_update_complete_event_rp0*)meta_evt->data;
gap->connection_params.conn_interval = event->Conn_Interval;
gap->connection_params.slave_latency = event->Conn_Latency;
gap->connection_params.supervisor_timeout = event->Supervision_Timeout;
FURI_LOG_I(TAG, "Connection parameters event complete");
gap_verify_connection_parameters(gap);
// Save rssi for current connection
fetch_rssi();
break;
}
case HCI_LE_PHY_UPDATE_COMPLETE_SUBEVT_CODE:
evt_le_phy_update_complete = (hci_le_phy_update_complete_event_rp0*)meta_evt->data;
if(evt_le_phy_update_complete->Status) {
FURI_LOG_E(
TAG, "Update PHY failed, status %d", evt_le_phy_update_complete->Status);
} else {
FURI_LOG_I(TAG, "Update PHY succeed");
}
ret = hci_le_read_phy(gap->service.connection_handle, &tx_phy, &rx_phy);
if(ret) {
FURI_LOG_E(TAG, "Read PHY failed, status: %d", ret);
} else {
FURI_LOG_I(TAG, "PHY Params TX = %d, RX = %d ", tx_phy, rx_phy);
}
break;
case HCI_LE_CONNECTION_COMPLETE_SUBEVT_CODE: {
hci_le_connection_complete_event_rp0* event =
(hci_le_connection_complete_event_rp0*)meta_evt->data;
gap->connection_params.conn_interval = event->Conn_Interval;
gap->connection_params.slave_latency = event->Conn_Latency;
gap->connection_params.supervisor_timeout = event->Supervision_Timeout;
// Stop advertising as connection completed
furi_timer_stop(gap->advertise_timer);
// Update connection status and handle
gap->state = GapStateConnected;
gap->service.connection_handle = event->Connection_Handle;
gap_verify_connection_parameters(gap);
// Save rssi for current connection
fetch_rssi();
// Start pairing by sending security request
aci_gap_slave_security_req(event->Connection_Handle);
} break;
default:
break;
}
break;
case HCI_VENDOR_SPECIFIC_DEBUG_EVT_CODE:
blue_evt = (evt_blecore_aci*)event_pckt->data;
switch(blue_evt->ecode) {
aci_gap_pairing_complete_event_rp0* pairing_complete;
case ACI_GAP_LIMITED_DISCOVERABLE_VSEVT_CODE:
FURI_LOG_I(TAG, "Limited discoverable event");
break;
case ACI_GAP_PASS_KEY_REQ_VSEVT_CODE: {
// Generate random PIN code
uint32_t pin = rand() % 999999; //-V1064
aci_gap_pass_key_resp(gap->service.connection_handle, pin);
if(furi_hal_rtc_is_flag_set(FuriHalRtcFlagLock)) {
FURI_LOG_I(TAG, "Pass key request event. Pin: ******");
} else {
FURI_LOG_I(TAG, "Pass key request event. Pin: %06ld", pin);
}
GapEvent event = {.type = GapEventTypePinCodeShow, .data.pin_code = pin};
gap->on_event_cb(event, gap->context);
} break;
case ACI_ATT_EXCHANGE_MTU_RESP_VSEVT_CODE: {
aci_att_exchange_mtu_resp_event_rp0* pr = (void*)blue_evt->data;
FURI_LOG_I(TAG, "Rx MTU size: %d", pr->Server_RX_MTU);
// Set maximum packet size given header size is 3 bytes
GapEvent event = {
.type = GapEventTypeUpdateMTU, .data.max_packet_size = pr->Server_RX_MTU - 3};
gap->on_event_cb(event, gap->context);
} break;
case ACI_GAP_AUTHORIZATION_REQ_VSEVT_CODE:
FURI_LOG_D(TAG, "Authorization request event");
break;
case ACI_GAP_SLAVE_SECURITY_INITIATED_VSEVT_CODE:
FURI_LOG_D(TAG, "Slave security initiated");
gap->is_secure = true;
break;
case ACI_GAP_BOND_LOST_VSEVT_CODE:
FURI_LOG_D(TAG, "Bond lost event. Start rebonding");
aci_gap_allow_rebond(gap->service.connection_handle);
break;
case ACI_GAP_ADDR_NOT_RESOLVED_VSEVT_CODE:
FURI_LOG_D(TAG, "Address not resolved event");
break;
case ACI_GAP_KEYPRESS_NOTIFICATION_VSEVT_CODE:
FURI_LOG_D(TAG, "Key press notification event");
break;
case ACI_GAP_NUMERIC_COMPARISON_VALUE_VSEVT_CODE: {
uint32_t pin =
((aci_gap_numeric_comparison_value_event_rp0*)(blue_evt->data))->Numeric_Value;
FURI_LOG_I(TAG, "Verify numeric comparison: %06lu", pin);
GapEvent event = {.type = GapEventTypePinCodeVerify, .data.pin_code = pin};
bool result = gap->on_event_cb(event, gap->context);
aci_gap_numeric_comparison_value_confirm_yesno(gap->service.connection_handle, result);
break;
}
case ACI_GAP_PAIRING_COMPLETE_VSEVT_CODE:
pairing_complete = (aci_gap_pairing_complete_event_rp0*)blue_evt->data;
if(pairing_complete->Status) {
FURI_LOG_E(
TAG,
"Pairing failed with status: %d. Terminating connection",
pairing_complete->Status);
aci_gap_terminate(gap->service.connection_handle, 5);
} else {
// Save RSSI
fetch_rssi();
FURI_LOG_I(TAG, "Pairing complete");
GapEvent event = {.type = GapEventTypeConnected};
gap->on_event_cb(event, gap->context); //-V595
}
break;
case ACI_L2CAP_CONNECTION_UPDATE_RESP_VSEVT_CODE:
FURI_LOG_D(TAG, "Procedure complete event");
break;
case ACI_L2CAP_CONNECTION_UPDATE_REQ_VSEVT_CODE: {
uint16_t result =
((aci_l2cap_connection_update_resp_event_rp0*)(blue_evt->data))->Result;
if(result == 0) {
FURI_LOG_D(TAG, "Connection parameters accepted");
} else if(result == 1) {
FURI_LOG_D(TAG, "Connection parameters denied");
}
break;
}
}
default:
break;
}
furi_mutex_release(gap->state_mutex);
return BleEventFlowEnable;
}
static void set_advertisment_service_uid(uint8_t* uid, uint8_t uid_len) {
if(uid_len == 2) {
gap->service.adv_svc_uuid[0] = AD_TYPE_16_BIT_SERV_UUID;
} else if(uid_len == 4) {
gap->service.adv_svc_uuid[0] = AD_TYPE_32_BIT_SERV_UUID;
} else if(uid_len == 16) {
gap->service.adv_svc_uuid[0] = AD_TYPE_128_BIT_SERV_UUID_CMPLT_LIST;
}
memcpy(&gap->service.adv_svc_uuid[gap->service.adv_svc_uuid_len], uid, uid_len);
gap->service.adv_svc_uuid_len += uid_len;
}
static void gap_init_svc(Gap* gap) {
tBleStatus status;
uint32_t srd_bd_addr[2];
// Configure mac address
aci_hal_write_config_data(
CONFIG_DATA_PUBADDR_OFFSET, CONFIG_DATA_PUBADDR_LEN, gap->config->mac_address);
/* Static random Address
* The two upper bits shall be set to 1
* The lowest 32bits is read from the UDN to differentiate between devices
* The RNG may be used to provide a random number on each power on
*/
srd_bd_addr[1] = 0x0000ED6E;
srd_bd_addr[0] = LL_FLASH_GetUDN();
aci_hal_write_config_data(
CONFIG_DATA_RANDOM_ADDRESS_OFFSET, CONFIG_DATA_RANDOM_ADDRESS_LEN, (uint8_t*)srd_bd_addr);
// Set Identity root key used to derive LTK and CSRK
aci_hal_write_config_data(CONFIG_DATA_IR_OFFSET, CONFIG_DATA_IR_LEN, (uint8_t*)gap_irk);
// Set Encryption root key used to derive LTK and CSRK
aci_hal_write_config_data(CONFIG_DATA_ER_OFFSET, CONFIG_DATA_ER_LEN, (uint8_t*)gap_erk);
// Set TX Power to 0 dBm
aci_hal_set_tx_power_level(1, 0x19);
// Initialize GATT interface
aci_gatt_init();
// Initialize GAP interface
// Skip first symbol AD_TYPE_COMPLETE_LOCAL_NAME
char* name = gap->service.adv_name + 1;
aci_gap_init(
GAP_PERIPHERAL_ROLE,
0,
strlen(name),
&gap->service.gap_svc_handle,
&gap->service.dev_name_char_handle,
&gap->service.appearance_char_handle);
// Set GAP characteristics
status = aci_gatt_update_char_value(
gap->service.gap_svc_handle,
gap->service.dev_name_char_handle,
0,
strlen(name),
(uint8_t*)name);
if(status) {
FURI_LOG_E(TAG, "Failed updating name characteristic: %d", status);
}
uint8_t gap_appearence_char_uuid[2] = {
gap->config->appearance_char & 0xff, gap->config->appearance_char >> 8};
status = aci_gatt_update_char_value(
gap->service.gap_svc_handle,
gap->service.appearance_char_handle,
0,
2,
gap_appearence_char_uuid);
if(status) {
FURI_LOG_E(TAG, "Failed updating appearence characteristic: %d", status);
}
// Set default PHY
hci_le_set_default_phy(ALL_PHYS_PREFERENCE, TX_2M_PREFERRED, RX_2M_PREFERRED);
// Set I/O capability
uint8_t auth_req_mitm_mode = MITM_PROTECTION_REQUIRED;
uint8_t auth_req_use_fixed_pin = USE_FIXED_PIN_FOR_PAIRING_FORBIDDEN;
bool keypress_supported = false;
if(gap->config->pairing_method == GapPairingPinCodeShow) {
aci_gap_set_io_capability(IO_CAP_DISPLAY_ONLY);
} else if(gap->config->pairing_method == GapPairingPinCodeVerifyYesNo) {
aci_gap_set_io_capability(IO_CAP_DISPLAY_YES_NO);
keypress_supported = true;
} else if(gap->config->pairing_method == GapPairingNone) {
// "Just works" pairing method (iOS accepts it, it seems Android and Linux don't)
auth_req_mitm_mode = MITM_PROTECTION_NOT_REQUIRED;
auth_req_use_fixed_pin = USE_FIXED_PIN_FOR_PAIRING_ALLOWED;
// If "just works" isn't supported, we want the numeric comparaison method
aci_gap_set_io_capability(IO_CAP_DISPLAY_YES_NO);
keypress_supported = true;
}
// Setup authentication
aci_gap_set_authentication_requirement(
gap->config->bonding_mode,
auth_req_mitm_mode,
CFG_SC_SUPPORT,
keypress_supported,
CFG_ENCRYPTION_KEY_SIZE_MIN,
CFG_ENCRYPTION_KEY_SIZE_MAX,
auth_req_use_fixed_pin,
0,
CFG_IDENTITY_ADDRESS);
// Configure whitelist
aci_gap_configure_whitelist();
}
static void gap_advertise_start(GapState new_state) {
tBleStatus status;
uint16_t min_interval;
uint16_t max_interval;
FURI_LOG_D(TAG, "Start: %d", new_state);
if(new_state == GapStateAdvFast) {
min_interval = 0x80; // 80 ms
max_interval = 0xa0; // 100 ms
} else {
min_interval = 0x0640; // 1 s
max_interval = 0x0fa0; // 2.5 s
}
// Stop advertising timer
furi_timer_stop(gap->advertise_timer);
if((new_state == GapStateAdvLowPower) &&
((gap->state == GapStateAdvFast) || (gap->state == GapStateAdvLowPower))) {
// Stop advertising
status = aci_gap_set_non_discoverable();
if(status) {
FURI_LOG_E(TAG, "set_non_discoverable failed %d", status);
} else {
FURI_LOG_D(TAG, "set_non_discoverable success");
}
}
// Configure advertising
status = aci_gap_set_discoverable(
ADV_IND,
min_interval,
max_interval,
CFG_IDENTITY_ADDRESS,
0,
strlen(gap->service.adv_name),
(uint8_t*)gap->service.adv_name,
gap->service.adv_svc_uuid_len,
gap->service.adv_svc_uuid,
0,
0);
if(status) {
FURI_LOG_E(TAG, "set_discoverable failed %d", status);
}
gap->state = new_state;
GapEvent event = {.type = GapEventTypeStartAdvertising};
gap->on_event_cb(event, gap->context);
furi_timer_start(gap->advertise_timer, INITIAL_ADV_TIMEOUT);
}
static void gap_advertise_stop(void) {
FURI_LOG_D(TAG, "Stop");
tBleStatus ret;
if(gap->state > GapStateIdle) {
if(gap->state == GapStateConnected) {
// Terminate connection
ret = aci_gap_terminate(gap->service.connection_handle, 0x13);
if(ret != BLE_STATUS_SUCCESS) {
FURI_LOG_E(TAG, "terminate failed %d", ret);
} else {
FURI_LOG_D(TAG, "terminate success");
}
}
// Stop advertising
furi_timer_stop(gap->advertise_timer);
ret = aci_gap_set_non_discoverable();
if(ret != BLE_STATUS_SUCCESS) {
FURI_LOG_E(TAG, "set_non_discoverable failed %d", ret);
} else {
FURI_LOG_D(TAG, "set_non_discoverable success");
}
gap->state = GapStateIdle;
}
GapEvent event = {.type = GapEventTypeStopAdvertising};
gap->on_event_cb(event, gap->context);
}
void gap_start_advertising(void) {
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
if(gap->state == GapStateIdle) {
gap->state = GapStateStartingAdv;
FURI_LOG_I(TAG, "Start advertising");
gap->enable_adv = true;
GapCommand command = GapCommandAdvFast;
furi_check(furi_message_queue_put(gap->command_queue, &command, 0) == FuriStatusOk);
}
furi_mutex_release(gap->state_mutex);
}
void gap_stop_advertising(void) {
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
if(gap->state > GapStateIdle) {
FURI_LOG_I(TAG, "Stop advertising");
gap->enable_adv = false;
GapCommand command = GapCommandAdvStop;
furi_check(furi_message_queue_put(gap->command_queue, &command, 0) == FuriStatusOk);
}
furi_mutex_release(gap->state_mutex);
}
static void gap_advertise_timer_callback(void* context) {
UNUSED(context);
GapCommand command = GapCommandAdvLowPower;
furi_check(furi_message_queue_put(gap->command_queue, &command, 0) == FuriStatusOk);
}
bool gap_init(GapConfig* config, GapEventCallback on_event_cb, void* context) {
if(!ble_glue_is_radio_stack_ready()) {
return false;
}
furi_check(gap == NULL);
gap = malloc(sizeof(Gap));
gap->config = config;
// Create advertising timer
gap->advertise_timer = furi_timer_alloc(gap_advertise_timer_callback, FuriTimerTypeOnce, NULL);
// Initialization of GATT & GAP layer
gap->service.adv_name = config->adv_name;
gap_init_svc(gap);
ble_event_dispatcher_init();
// Initialization of the GAP state
gap->state_mutex = furi_mutex_alloc(FuriMutexTypeNormal);
gap->state = GapStateIdle;
gap->service.connection_handle = 0xFFFF;
gap->enable_adv = true;
gap->conn_rssi = 127;
gap->time_rssi_sample = 0;
// Command queue allocation
gap->command_queue = furi_message_queue_alloc(8, sizeof(GapCommand));
// Thread configuration
gap->thread = furi_thread_alloc_ex("BleGapDriver", 1024, gap_app, gap);
furi_thread_start(gap->thread);
// Set initial state
gap->is_secure = false;
gap->negotiation_round = 0;
uint8_t adv_service_uid[2];
gap->service.adv_svc_uuid_len = 1;
adv_service_uid[0] = gap->config->adv_service_uuid & 0xff;
adv_service_uid[1] = gap->config->adv_service_uuid >> 8;
set_advertisment_service_uid(adv_service_uid, sizeof(adv_service_uid));
// Set callback
gap->on_event_cb = on_event_cb;
gap->context = context;
return true;
}
// Get RSSI
uint32_t gap_get_remote_conn_rssi(int8_t* rssi) {
if(gap && gap->state == GapStateConnected) {
fetch_rssi();
*rssi = gap->conn_rssi;
if(gap->time_rssi_sample) return furi_get_tick() - gap->time_rssi_sample;
}
return 0;
}
GapState gap_get_state(void) {
GapState state;
if(gap) {
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
state = gap->state;
furi_mutex_release(gap->state_mutex);
} else {
state = GapStateUninitialized;
}
return state;
}
void gap_thread_stop(void) {
if(gap) {
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
gap->enable_adv = false;
GapCommand command = GapCommandKillThread;
furi_message_queue_put(gap->command_queue, &command, FuriWaitForever);
furi_mutex_release(gap->state_mutex);
furi_thread_join(gap->thread);
furi_thread_free(gap->thread);
// Free resources
furi_mutex_free(gap->state_mutex);
furi_message_queue_free(gap->command_queue);
furi_timer_free(gap->advertise_timer);
ble_event_dispatcher_reset();
free(gap);
gap = NULL;
}
}
static int32_t gap_app(void* context) {
UNUSED(context);
GapCommand command;
while(1) {
FuriStatus status = furi_message_queue_get(gap->command_queue, &command, FuriWaitForever);
if(status != FuriStatusOk) {
FURI_LOG_E(TAG, "Message queue get error: %d", status);
continue;
}
furi_mutex_acquire(gap->state_mutex, FuriWaitForever);
if(command == GapCommandKillThread) {
break;
}
if(command == GapCommandAdvFast) {
gap_advertise_start(GapStateAdvFast);
} else if(command == GapCommandAdvLowPower) {
gap_advertise_start(GapStateAdvLowPower);
} else if(command == GapCommandAdvStop) {
gap_advertise_stop();
}
furi_mutex_release(gap->state_mutex);
}
return 0;
}
void gap_emit_ble_beacon_status_event(bool active) {
GapEvent event = {.type = active ? GapEventTypeBeaconStart : GapEventTypeBeaconStop};
gap->on_event_cb(event, gap->context);
FURI_LOG_I(TAG, "Beacon status event: %d", active);
}
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