extmod/btstack: Update BTstack bindings to work with latest BTstack.

The following multi-tests pass (eg with PYBD_SF6+LEGO_HUB_NO6):

    ble_gap_advertise.py
    ble_gap_connect.py
    ble_gap_device_name.py
    ble_gattc_discover_services.py
    ble_gatt_data_transfer.py
    perf_gatt_char_write.py
    perf_gatt_notify.py
    stress_log_filesystem.py

These are the same tests that passed prior to this BTstack update.

Also tested on the unix port using H4 transport.

Signed-off-by: Damien George <damien@micropython.org>

extmod/btstack/btstack_config.h

@@ -6,7 +6,7 @@
 #define ENABLE_LE_PERIPHERAL
 #define ENABLE_LE_CENTRAL
 // #define ENABLE_CLASSIC
-#define ENABLE_LE_DATA_CHANNELS
+#define ENABLE_L2CAP_LE_CREDIT_BASED_FLOW_CONTROL_MODE
 // #define ENABLE_LOG_INFO
 // #define ENABLE_LOG_DEBUG
 #define ENABLE_LOG_ERROR

extmod/btstack/btstack_hci_uart.c

@@ -159,6 +159,12 @@ const btstack_uart_block_t mp_bluetooth_btstack_hci_uart_block = {
     &btstack_uart_get_supported_sleep_modes,
     &btstack_uart_set_sleep,
     &btstack_uart_set_wakeup_handler,
+
+    // The following are needed for H5 mode only.
+    NULL, // set_frame_received
+    NULL, // set_frame_sent,
+    NULL, // receive_frame,
+    NULL, // send_frame,
 };
 
 void mp_bluetooth_btstack_hci_uart_process(void) {

extmod/btstack/btstack_hci_uart.h

@@ -28,7 +28,7 @@
 #ifndef MICROPY_INCLUDED_EXTMOD_BTSTACK_HCI_UART_H
 #define MICROPY_INCLUDED_EXTMOD_BTSTACK_HCI_UART_H
 
-#include "lib/btstack/src/btstack.h"
+#include "lib/btstack/src/btstack_uart_block.h"
 
 // --- Used by the port to create the HCI transport ---------------------------
 extern const btstack_uart_block_t mp_bluetooth_btstack_hci_uart_block;

extmod/btstack/modbluetooth_btstack.c

@@ -368,7 +368,7 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
                event_type == SM_EVENT_PAIRING_COMPLETE ||
                // event_type == GAP_EVENT_DEDICATED_BONDING_COMPLETED || // No conn_handle
                event_type == HCI_EVENT_ENCRYPTION_CHANGE) {
-        DEBUG_printf("  --> enc/auth/pair/bond change\n", );
+        DEBUG_printf("  --> enc/auth/pair/bond change\n");
         #if MICROPY_PY_BLUETOOTH_ENABLE_PAIRING_BONDING
         uint16_t conn_handle;
         switch (event_type) {
@@ -420,6 +420,11 @@ STATIC void btstack_packet_handler(uint8_t packet_type, uint8_t *packet, uint8_t
         mp_bluetooth_gap_on_scan_result(address_type, address, adv_event_type, rssi, data, length);
     #endif // MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
     #if MICROPY_PY_BLUETOOTH_ENABLE_GATT_CLIENT
+    } else if (event_type == GATT_EVENT_MTU) {
+        // This is triggered in client mode.
+        uint16_t conn_handle = gatt_event_mtu_get_handle(packet);
+        uint16_t mtu = gatt_event_mtu_get_MTU(packet);
+        mp_bluetooth_gatts_on_mtu_exchanged(conn_handle, mtu);
     } else if (event_type == GATT_EVENT_QUERY_COMPLETE) {
         uint16_t conn_handle = gatt_event_query_complete_get_handle(packet);
         uint16_t status = gatt_event_query_complete_get_att_status(packet);
@@ -625,6 +630,19 @@ STATIC void set_random_address(void) {
     DEBUG_printf("set_random_address: Address loaded by controller\n");
 }
 
+STATIC void deinit_stack(void) {
+    mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
+
+    // Deinitialise BTstack components.
+    sm_deinit();
+    l2cap_deinit();
+    hci_deinit();
+    btstack_memory_deinit();
+    btstack_run_loop_deinit();
+
+    MP_STATE_PORT(bluetooth_btstack_root_pointers) = NULL;
+}
+
 int mp_bluetooth_init(void) {
     DEBUG_printf("mp_bluetooth_init\n");
 
@@ -702,8 +720,8 @@ int mp_bluetooth_init(void) {
         // Attempt a shutdown (may not do anything).
         mp_bluetooth_btstack_port_deinit();
 
-        // Clean up.
-        MP_STATE_PORT(bluetooth_btstack_root_pointers) = NULL;
+        // Clean up BTstack.
+        deinit_stack();
 
         return timeout ? MP_ETIMEDOUT : MP_EINVAL;
     }
@@ -757,8 +775,8 @@ void mp_bluetooth_deinit(void) {
     }
     btstack_run_loop_remove_timer(&btstack_init_deinit_timeout);
 
-    mp_bluetooth_btstack_state = MP_BLUETOOTH_BTSTACK_STATE_OFF;
-    MP_STATE_PORT(bluetooth_btstack_root_pointers) = NULL;
+    // Clean up BTstack.
+    deinit_stack();
 
     DEBUG_printf("mp_bluetooth_deinit: complete\n");
 }

ports/stm32/mpbtstackport.c

@@ -31,6 +31,7 @@
 #if MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK
 
 #include "lib/btstack/src/btstack.h"
+#include "lib/btstack/src/hci_transport_h4.h"
 #include "extmod/mpbthci.h"
 #include "extmod/btstack/btstack_hci_uart.h"
 #include "extmod/btstack/modbluetooth_btstack.h"
@@ -137,16 +138,10 @@ void mp_bluetooth_hci_poll(void) {
 }
 
 void mp_bluetooth_btstack_port_init(void) {
-    static bool run_loop_init = false;
-    if (!run_loop_init) {
-        run_loop_init = true;
-        btstack_run_loop_init(&mp_btstack_runloop_stm32);
-    } else {
-        mp_btstack_runloop_stm32.init();
-    }
+    btstack_run_loop_init(&mp_btstack_runloop_stm32);
 
     // hci_dump_open(NULL, HCI_DUMP_STDOUT);
-    const hci_transport_t *transport = hci_transport_h4_instance(&mp_bluetooth_btstack_hci_uart_block);
+    const hci_transport_t *transport = hci_transport_h4_instance_for_uart(&mp_bluetooth_btstack_hci_uart_block);
     hci_init(transport, &hci_transport_config_uart);
 
     #ifdef MICROPY_HW_BLE_BTSTACK_CHIPSET_INSTANCE

ports/unix/mpbtstackport_common.c

@@ -79,13 +79,7 @@ uint32_t hal_time_ms(void) {
 }
 
 void mp_bluetooth_btstack_port_init(void) {
-    static bool run_loop_init = false;
-    if (!run_loop_init) {
-        run_loop_init = true;
-        btstack_run_loop_init(btstack_run_loop_embedded_get_instance());
-    } else {
-        btstack_run_loop_embedded_get_instance()->init();
-    }
+    btstack_run_loop_init(btstack_run_loop_embedded_get_instance());
 
     // hci_dump_open(NULL, HCI_DUMP_STDOUT);
 

ports/unix/mpbtstackport_h4.c

@@ -32,6 +32,7 @@
 
 #if MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK && MICROPY_BLUETOOTH_BTSTACK_H4
 
+#include "lib/btstack/src/hci_transport_h4.h"
 #include "lib/btstack/chipset/zephyr/btstack_chipset_zephyr.h"
 
 #include "extmod/btstack/btstack_hci_uart.h"
@@ -42,11 +43,12 @@
 #define DEBUG_printf(...) // printf(__VA_ARGS__)
 
 STATIC hci_transport_config_uart_t hci_transport_config_uart = {
-    HCI_TRANSPORT_CONFIG_UART,
-    1000000, // initial baudrate
-    0,       // main baudrate
-    1,       // flow control
-    NULL,    // device name
+    .type = HCI_TRANSPORT_CONFIG_UART,
+    .baudrate_init = 1000000,
+    .baudrate_main = 0,
+    .flowcontrol = 1,
+    .device_name = NULL,
+    .parity = BTSTACK_UART_PARITY_OFF,
 };
 
 void mp_bluetooth_hci_poll_h4(void) {
@@ -58,7 +60,7 @@ void mp_bluetooth_hci_poll_h4(void) {
 void mp_bluetooth_btstack_port_init_h4(void) {
     DEBUG_printf("mp_bluetooth_btstack_port_init_h4\n");
 
-    const hci_transport_t *transport = hci_transport_h4_instance(&mp_bluetooth_btstack_hci_uart_block);
+    const hci_transport_t *transport = hci_transport_h4_instance_for_uart(&mp_bluetooth_btstack_hci_uart_block);
     hci_init(transport, &hci_transport_config_uart);
 
     hci_set_chipset(btstack_chipset_zephyr_instance());

ports/unix/mpbtstackport_usb.c

@@ -34,6 +34,7 @@
 #if MICROPY_PY_BLUETOOTH && MICROPY_BLUETOOTH_BTSTACK && MICROPY_BLUETOOTH_BTSTACK_USB
 
 #include "lib/btstack/src/btstack.h"
+#include "lib/btstack/src/hci_transport_usb.h"
 #include "lib/btstack/platform/embedded/btstack_run_loop_embedded.h"
 #include "lib/btstack/platform/embedded/hal_cpu.h"
 #include "lib/btstack/platform/embedded/hal_time_ms.h"