Refine _bleio

This PR refines the _bleio API. It was originally motivated by
the addition of a new CircuitPython service that enables reading
and modifying files on the device. Moving the BLE lifecycle outside
of the VM motivated a number of changes to remove heap allocations
in some APIs.

It also motivated unifying connection initiation to the Adapter class
rather than the Central and Peripheral classes which have been removed.
Adapter now handles the GAP portion of BLE including advertising, which
has moved but is largely unchanged, and scanning, which has been enhanced
to return an iterator of filtered results.

Once a connection is created (either by us (aka Central) or a remote
device (aka Peripheral)) it is represented by a new Connection class.
This class knows the current connection state and can discover and
instantiate remote Services along with their Characteristics and
Descriptors.

Relates to #586

1 files changed, 42 insertions, 1 deletions

diff --git a/shared-module/_bleio/ScanEntry.c b/shared-module/_bleio/ScanEntry.c
index 8dfa17f31..785209c4a 100644
--- a/shared-module/_bleio/ScanEntry.c
+++ b/shared-module/_bleio/ScanEntry.c
@@ -37,9 +37,50 @@ mp_obj_t common_hal_bleio_scanentry_get_address(bleio_scanentry_obj_t *self) {
 }
 
 mp_obj_t common_hal_bleio_scanentry_get_advertisement_bytes(bleio_scanentry_obj_t *self) {
-    return self->data;
+    return MP_OBJ_FROM_PTR(self->data);
 }
 
 mp_int_t common_hal_bleio_scanentry_get_rssi(bleio_scanentry_obj_t *self) {
     return self->rssi;
 }
+
+bool common_hal_bleio_scanentry_get_connectable(bleio_scanentry_obj_t *self) {
+    return self->connectable;
+}
+
+bool common_hal_bleio_scanentry_get_scan_response(bleio_scanentry_obj_t *self) {
+    return self->scan_response;
+}
+
+bool bleio_scanentry_data_matches(const uint8_t* data, size_t len, const uint8_t* prefixes, size_t prefixes_length, bool any) {
+    if (prefixes_length == 0) {
+        return true;
+    }
+    size_t i = 0;
+    while(i < prefixes_length) {
+        uint8_t prefix_length = prefixes[i];
+        i += 1;
+        size_t j = 0;
+        while (j < len) {
+            uint8_t structure_length = data[j];
+            j += 1;
+            if (structure_length == 0) {
+                break;
+            }
+            if (structure_length >= prefix_length && memcmp(data + j, prefixes + i, prefix_length) == 0) {
+                if (any) {
+                    return true;
+                }
+            } else if (!any) {
+                return false;
+            }
+            j += structure_length;
+        }
+        i += prefix_length;
+    }
+    return !any;
+}
+
+bool common_hal_bleio_scanentry_matches(bleio_scanentry_obj_t *self, const uint8_t* prefixes, size_t prefixes_len, bool all) {
+    return bleio_scanentry_data_matches(self->data->data, self->data->len, prefixes, prefixes_len, !all);
+}