Bluetooth: CAP: Commander Reception start procedure

Add the CAP commander reception start procedure which starts reception
on one or more CAP acceptors

With the implementation of broadcast reception start procedure we also need
some mockups for unit testing

Signed-off-by: Andries Kruithof <andries.kruithof@nordicsemi.no>

Author: Andries Kruithof

include/zephyr/bluetooth/audio/cap.h

@@ -750,6 +750,20 @@ struct bt_cap_commander_cb {
 	void (*microphone_gain_changed)(struct bt_conn *conn, int err);
 #endif /* CONFIG_BT_MICP_MIC_CTLR_AICS */
 #endif /* CONFIG_BT_MICP_MIC_CTLR */
+
+#if defined(CONFIG_BT_BAP_BROADCAST_ASSISTANT)
+	/**
+	 * @brief Callback for bt_cap_commander_broadcast_reception_start().
+	 *
+	 * @param conn		Pointer to the connection where the error
+	 *			occurred. NULL if @p err is 0 or if cancelled by
+	 *			bt_cap_commander_cancel()
+	 * @param err		0 on success, BT_GATT_ERR() with a
+	 *			specific ATT (BT_ATT_ERR_*) error code or -ECANCELED if cancelled
+	 *			by bt_cap_commander_cancel().
+	 */
+	void (*broadcast_reception_start)(struct bt_conn *conn, int err);
+#endif /* CONFIG_BT_BAP_BROADCAST_ASSISTANT */
 };
 
 /**
@@ -842,7 +856,7 @@ struct bt_cap_commander_broadcast_reception_start_member_param {
 	 *
 	 * At least one bit in one of the subgroups bis_sync parameters shall be set.
 	 */
-	struct bt_bap_bass_subgroup *subgroups;
+	struct bt_bap_bass_subgroup subgroups[CONFIG_BT_BAP_BASS_MAX_SUBGROUPS];
 
 	/** Number of subgroups */
 	size_t num_subgroups;

subsys/bluetooth/audio/bap_internal.h

@@ -123,3 +123,16 @@ static inline const char *bt_bap_big_enc_state_str(uint8_t state)
 		return "unknown state";
 	}
 }
+
+static inline bool valid_bis_syncs(uint32_t bis_sync)
+{
+	if (bis_sync == BT_BAP_BIS_SYNC_NO_PREF) {
+		return true;
+	}
+
+	if (bis_sync > BIT_MASK(31)) { /* Max BIS index */
+		return false;
+	}
+
+	return true;
+}

subsys/bluetooth/audio/bap_scan_delegator.c

@@ -88,19 +88,6 @@ static bool bits_subset_of(uint32_t a, uint32_t b)
 	return (((a) & (~(b))) == 0);
 }
 
-static bool valid_bis_syncs(uint32_t bis_sync)
-{
-	if (bis_sync == BT_BAP_BIS_SYNC_NO_PREF) {
-		return true;
-	}
-
-	if (bis_sync > BIT_MASK(31)) { /* Max BIS index */
-		return false;
-	}
-
-	return true;
-}
-
 static bool bis_syncs_unique_or_no_pref(uint32_t requested_bis_syncs,
 					uint32_t aggregated_bis_syncs)
 {