mesh: Return change information from bt_mesh_iv_update()

This will soon be useful to the callers of bt_mesh_iv_update(), in
particular Friend support.

X-Original-Commit: 9b4b858eec665aa008c9836106130c21e3800c5a

nimble/host/mesh/src/net.c

@@ -558,7 +558,7 @@ void bt_mesh_rpl_reset(void)
 	}
 }
 
-void bt_mesh_iv_update(u32_t iv_index, bool iv_update)
+bool bt_mesh_iv_update(u32_t iv_index, bool iv_update)
 {
 	int i;
 
@@ -568,13 +568,13 @@ void bt_mesh_iv_update(u32_t iv_index, bool iv_update)
 		if (iv_index != bt_mesh.iv_index) {
 			BT_WARN("IV Index mismatch: 0x%08x != 0x%08x",
 				iv_index, bt_mesh.iv_index);
-			return;
+			return false;
 		}
 
 		if (iv_update) {
 			/* Nothing to do */
 			BT_DBG("Already in IV Update in Progress state");
-			return;
+			return false;
 		}
 	} else  {
 		/* We're currently in Normal mode */
@@ -583,7 +583,7 @@ void bt_mesh_iv_update(u32_t iv_index, bool iv_update)
 		    iv_index > bt_mesh.iv_index + 42) {
 			BT_ERR("IV Index out of sync: " "0x%08x != 0x%08x",
 			       iv_index, bt_mesh.iv_index);
-			return;
+			return false;
 		}
 
 		if (iv_index > bt_mesh.iv_index + 1) {
@@ -597,19 +597,19 @@ void bt_mesh_iv_update(u32_t iv_index, bool iv_update)
 		if (iv_index == bt_mesh.iv_index + 1 && !iv_update) {
 			BT_WARN("Ignoring new index in normal mode",
 				iv_index, bt_mesh.iv_index);
-			return;
+			return false;
 		}
 
 		if (!iv_update) {
 			/* Nothing to do */
 			BT_DBG("Already in Normal mode");
-			return;
+			return false;
 		}
 
 		if (iv_index != bt_mesh.iv_index + 1) {
 			BT_WARN("Wrong new IV Index: 0x%08x != 0x%08x + 1",
 				iv_index, bt_mesh.iv_index);
-			return;
+			return false;
 		}
 	}
 
@@ -618,7 +618,7 @@ void bt_mesh_iv_update(u32_t iv_index, bool iv_update)
 
 		if (delta < K_HOURS(96)) {
 			BT_WARN("IV Update before minimum duration");
-			return;
+			return false;
 		}
 	}
 
@@ -626,7 +626,7 @@ void bt_mesh_iv_update(u32_t iv_index, bool iv_update)
 	if (!iv_update && bt_mesh_tx_in_progress()) {
 		BT_WARN("IV Update deferred because of pending transfer");
 		bt_mesh.pending_update = 1;
-		return;
+		return false;
 	}
 
 do_update:
@@ -655,6 +655,8 @@ do_update:
 			bt_mesh_net_beacon_update(&bt_mesh.sub[i]);
 		}
 	}
+
+	return false;
 }
 
 int bt_mesh_net_resend(struct bt_mesh_subnet *sub, struct os_mbuf *buf,

nimble/host/mesh/src/net.h

@@ -279,7 +279,7 @@ bt_mesh_net_beacon_update(struct bt_mesh_subnet *sub);
 void
 bt_mesh_rpl_reset(void);
 
-void
+bool
 bt_mesh_iv_update(u32_t iv_index, bool iv_update);
 
 struct bt_mesh_subnet *