From 27805f8ff28f57d31021c41b0ef047cb0c4f798c Mon Sep 17 00:00:00 2001
From: Joseph Henry <joseph.henry@zerotier.com>
Date: Tue, 18 Jul 2023 13:04:40 -0700
Subject: [PATCH] Add low-bandwidth mode

---
 src/Controls.cpp    |  6 ++++++
 src/NodeService.cpp | 10 ++++++++++
 src/NodeService.hpp |  3 +++
 3 files changed, 19 insertions(+)

diff --git a/src/Controls.cpp b/src/Controls.cpp
index 536868f..6bc3456 100644
--- a/src/Controls.cpp
+++ b/src/Controls.cpp
@@ -133,6 +133,12 @@ int zts_init_set_roots(const void* roots_data, unsigned int len)
     return zts_service->setRoots(roots_data, len);
 }
 
+int zts_init_set_low_bandwidth_mode(bool enabled)
+{
+    ACQUIRE_SERVICE_OFFLINE();
+    return zts_service->setLowBandwidthMode(enabled);
+}
+
 int zts_init_set_port(unsigned short port)
 {
     ACQUIRE_SERVICE_OFFLINE();
diff --git a/src/NodeService.cpp b/src/NodeService.cpp
index 15b18ad..71e1dca 100644
--- a/src/NodeService.cpp
+++ b/src/NodeService.cpp
@@ -1829,6 +1829,16 @@ int NodeService::setRoots(const void* rootsData, unsigned int len)
     return ZTS_ERR_OK;
 }
 
+int_fast32_t NodeService::setLowBandwidthMode(bool enabled)
+{
+    Mutex::Lock _lr(_run_m);
+    if (_run) {
+        return ZTS_ERR_SERVICE;
+    }
+    _node->setLowBandwidthMode(enabled);
+    return ZTS_ERR_OK;
+}
+
 int NodeService::addInterfacePrefixToBlacklist(const char* prefix, unsigned int len)
 {
     if (! prefix || len == 0 || len > 15) {
diff --git a/src/NodeService.hpp b/src/NodeService.hpp
index d9a9925..edd241c 100644
--- a/src/NodeService.hpp
+++ b/src/NodeService.hpp
@@ -398,6 +398,9 @@ class NodeService {
     /** Set the roots definition */
     int setRoots(const void* data, unsigned int len);
 
+    /** Enable or disable low-bandwidth mode (sends less ambient traffic, network updates happen less frequently) */
+    int setLowBandwidthMode(bool enabled);
+
     /** Add Interface prefix to blacklist (prevents ZeroTier from using that interface) */
     int addInterfacePrefixToBlacklist(const char* prefix, unsigned int len);