extmod/btstack: Schedule notify/indicate/write ops for bg completion.

The goal of this commit is to allow using ble.gatts_notify() at any time,
even if the stack is not ready to send the notification right now.  It also
addresses the same issue for ble.gatts_indicate() and ble.gattc_write()
(without response).  In addition this commit fixes the case where the
buffer passed to write-with-response wasn't copied, meaning it could be
modified by the caller, affecting the in-progress write.

The changes are:

- gatts_notify/indicate will now run in the background if the ACL buffer is
  currently full, meaning that notify/indicate can be called at any time.

- gattc_write(mode=0) (no response) will now allow for one outstanding
  write.

- gattc_write(mode=1) (with response) will now copy the buffer so that it
  can't be modified by the caller while the write is in progress.

All four paths also now track the buffer while the operation is in
progress, which prevents the GC free'ing the buffer while it's still
needed.

1 files changed, 3 insertions, 0 deletions

diff --git a/extmod/btstack/modbluetooth_btstack.h b/extmod/btstack/modbluetooth_btstack.h
index 3bdb5f271e..c943b6d72d 100644
--- a/extmod/btstack/modbluetooth_btstack.h
+++ b/extmod/btstack/modbluetooth_btstack.h
@@ -33,6 +33,8 @@
 
 #include "lib/btstack/src/btstack.h"
 
+typedef struct _mp_btstack_pending_op_t mp_btstack_pending_op_t;
+
 typedef struct _mp_bluetooth_btstack_root_pointers_t {
     // This stores both the advertising data and the scan response data, concatenated together.
     uint8_t *adv_data;
@@ -45,6 +47,7 @@ typedef struct _mp_bluetooth_btstack_root_pointers_t {
     #if MICROPY_PY_BLUETOOTH_ENABLE_CENTRAL_MODE
     // Registration for notify/indicate events.
     gatt_client_notification_t notification;
+    btstack_linked_list_t pending_ops;
     #endif
 } mp_bluetooth_btstack_root_pointers_t;