Add low-bandwidth mode

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();

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) {

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);