Bluetooth: Mesh: Add SAR srv persistence storage

Adds persistent storage for SAR server RX and TX set cmd parameters.
Also ensures that SAR RX and TX parameters are set back to default values
upon reset of the mesh device.

Signed-off-by: Anders Storrø <anders.storro@nordicsemi.no>

Author: Andrewpini

subsys/bluetooth/mesh/sar_cfg_srv.c

@@ -21,11 +21,28 @@
 #include "foundation.h"
 #include "mesh.h"
 #include "sar_cfg_internal.h"
+#include "settings.h"
 
 #define LOG_LEVEL CONFIG_BT_MESH_MODEL_LOG_LEVEL
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(bt_mesh_sar_cfg_srv);
 
+static int sar_rx_store(struct bt_mesh_model *model, bool delete)
+{
+	const void *data = delete ? NULL : &bt_mesh.sar_rx;
+	size_t len = delete ? 0 : sizeof(struct bt_mesh_sar_rx);
+
+	return bt_mesh_model_data_store(model, false, "sar_rx", data, len);
+}
+
+static int sar_tx_store(struct bt_mesh_model *model, bool delete)
+{
+	const void *data = delete ? NULL : &bt_mesh.sar_tx;
+	size_t len = delete ? 0 : sizeof(struct bt_mesh_sar_tx);
+
+	return bt_mesh_model_data_store(model, false, "sar_tx", data, len);
+}
+
 static void transmitter_status(struct bt_mesh_model *model,
 			       struct bt_mesh_msg_ctx *ctx)
 {
@@ -84,6 +101,10 @@ static int transmitter_set(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *
 	bt_mesh_sar_tx_decode(buf, tx);
 	transmitter_status(model, ctx);
 
+	if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
+		sar_tx_store(model, false);
+	}
+
 	return 0;
 }
 
@@ -107,6 +128,10 @@ static int receiver_set(struct bt_mesh_model *model, struct bt_mesh_msg_ctx *ctx
 	bt_mesh_sar_rx_decode(buf, rx);
 	receiver_status(model, ctx);
 
+	if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
+		sar_rx_store(model, false);
+	}
+
 	return 0;
 }
 
@@ -135,6 +160,42 @@ static int sar_cfg_srv_init(struct bt_mesh_model *model)
 	return 0;
 }
 
+static void sar_cfg_srv_reset(struct bt_mesh_model *model)
+{
+	struct bt_mesh_sar_tx sar_tx = BT_MESH_SAR_TX_INIT;
+	struct bt_mesh_sar_rx sar_rx = BT_MESH_SAR_RX_INIT;
+
+	bt_mesh.sar_tx = sar_tx;
+	bt_mesh.sar_rx = sar_rx;
+
+	if (IS_ENABLED(CONFIG_BT_SETTINGS)) {
+		sar_rx_store(model, true);
+		sar_tx_store(model, true);
+	}
+}
+
+#ifdef CONFIG_BT_SETTINGS
+static int sar_cfg_srv_settings_set(struct bt_mesh_model *model, const char *name, size_t len_rd,
+				    settings_read_cb read_cb, void *cb_data)
+{
+	if (!strncmp(name, "sar_rx", 5)) {
+		return bt_mesh_settings_set(read_cb, cb_data, &bt_mesh.sar_rx,
+					    sizeof(bt_mesh.sar_rx));
+	}
+
+	if (!strncmp(name, "sar_tx", 5)) {
+		return bt_mesh_settings_set(read_cb, cb_data, &bt_mesh.sar_tx,
+					    sizeof(bt_mesh.sar_tx));
+	}
+
+	return 0;
+}
+#endif
+
 const struct bt_mesh_model_cb bt_mesh_sar_cfg_srv_cb = {
 	.init = sar_cfg_srv_init,
+	.reset = sar_cfg_srv_reset,
+#ifdef CONFIG_BT_SETTINGS
+	.settings_set = sar_cfg_srv_settings_set
+#endif
 };