samples: Bluetooth: Add streaming callback for unicast server

The unicast server now prints when a steam enters the streaming
state.

This commit also slightly increases the metadata size to increase
interoperability with other devices such as Android.

Signed-off-by: Emil Gydesen <emil.gydesen@nordicsemi.no>

samples/bluetooth/bap_unicast_server/prj.conf

@@ -11,6 +11,8 @@ CONFIG_BT_ISO_TX_BUF_COUNT=2
 # Support an ISO channel per ASE
 CONFIG_BT_ISO_MAX_CHAN=4
 
+CONFIG_BT_AUDIO_CODEC_CFG_MAX_METADATA_SIZE=10
+
 # Mandatory to support at least 1 for ASCS
 CONFIG_BT_ATT_PREPARE_COUNT=1
 

samples/bluetooth/bap_unicast_server/src/main.c

@@ -551,6 +551,10 @@ static void stream_stopped(struct bt_bap_stream *stream, uint8_t reason)
 	k_work_cancel_delayable(&audio_send_work);
 }
 
+static void stream_started(struct bt_bap_stream *stream)
+{
+	printk("Audio Stream %p started\n", stream);
+}
 
 static void stream_enabled_cb(struct bt_bap_stream *stream)
 {
@@ -573,6 +577,7 @@ static struct bt_bap_stream_ops stream_ops = {
 	.recv = stream_recv,
 #endif
 	.stopped = stream_stopped,
+	.started = stream_started,
 	.enabled = stream_enabled_cb,
 };