extmod/modbluetooth: Register default GATT service and fix esp32 init.

This is for the NimBLE bindings, to make sure the default GATT service
appears and that the esp32 initialises NimBLE correctly (it now matches
stm32).

extmod/nimble/modbluetooth_nimble.c

@@ -39,6 +39,7 @@
 #include "nimble/ble.h"
 #include "nimble/nimble_port.h"
 #include "services/gap/ble_svc_gap.h"
+#include "services/gatt/ble_svc_gatt.h"
 
 #ifndef MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME
 #define MICROPY_PY_BLUETOOTH_DEFAULT_GAP_NAME "MPY NIMBLE"
@@ -271,8 +272,9 @@ int mp_bluetooth_init(void) {
     nimble_port_init();
     mp_bluetooth_nimble_port_postinit();
 
-    // By default, just register the default gap service.
+    // By default, just register the default gap/gatt service.
     ble_svc_gap_init();
+    ble_svc_gatt_init();
 
     mp_bluetooth_nimble_port_start();
 
@@ -466,8 +468,9 @@ int mp_bluetooth_gatts_register_service_begin(bool append) {
     // Reset the gatt characteristic value db.
     mp_bluetooth_gatts_db_reset(MP_STATE_PORT(bluetooth_nimble_root_pointers)->gatts_db);
 
-    // By default, just register the default gap service.
+    // By default, just register the default gap/gatt service.
     ble_svc_gap_init();
+    ble_svc_gatt_init();
 
     if (!append) {
         // Unref any previous service definitions.

ports/esp32/nimble.c

@@ -44,7 +44,6 @@ void mp_bluetooth_nimble_port_preinit(void) {
 }
 
 void mp_bluetooth_nimble_port_postinit(void) {
-    nimble_port_freertos_init(ble_host_task);
 }
 
 void mp_bluetooth_nimble_port_deinit(void) {
@@ -52,6 +51,7 @@ void mp_bluetooth_nimble_port_deinit(void) {
 }
 
 void mp_bluetooth_nimble_port_start(void) {
+    nimble_port_freertos_init(ble_host_task);
 }
 
 #endif