--- /dev/null
+#define _GNU_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <assert.h>
+#include <errno.h>
+
+#include "utils.h"
+
+void set_sync_flag(struct sync_flag *s) {
+ pthread_mutex_lock(&s->mutex);
+ s->flag = true;
+ pthread_cond_broadcast(&s->cond);
+ pthread_mutex_unlock(&s->mutex);
+}
+
+bool wait_sync_flag(struct sync_flag *s, int seconds) {
+ struct timespec timeout;
+ clock_gettime(CLOCK_REALTIME, &timeout);
+ timeout.tv_sec += seconds;
+
+ while(!s->flag)
+ if(!pthread_cond_timedwait(&s->cond, &s->mutex, &timeout) || errno != EINTR)
+ break;
+
+ return s->flag;
+}
+
+void open_meshlink_pair(meshlink_handle_t **pa, meshlink_handle_t **pb, const char *prefix) {
+ // Create two new MeshLink instances
+
+ *pa = *pb = NULL;
+
+ char *a_name, *b_name;
+
+ asprintf(&a_name, "%s_conf.1", prefix);
+ assert(a_name);
+
+ asprintf(&b_name, "%s_conf.2", prefix);
+ assert(b_name);
+
+ meshlink_handle_t *a = meshlink_open(a_name, "a", prefix, DEV_CLASS_BACKBONE);
+ assert(a);
+
+ meshlink_handle_t *b = meshlink_open(b_name, "b", prefix, DEV_CLASS_BACKBONE);
+ assert(b);
+
+ meshlink_enable_discovery(a, false);
+ meshlink_enable_discovery(b, false);
+
+ // Import and export both side's data
+
+ meshlink_add_address(a, "localhost");
+
+ char *data = meshlink_export(a);
+ assert(data);
+ assert(meshlink_import(b, data));
+ free(data);
+
+ data = meshlink_export(b);
+ assert(data);
+ assert(meshlink_import(a, data));
+ free(data);
+
+ *pa = a;
+ *pb = b;
+}
+
+// Don't poll in the application thread, use a condition variable to signal when the peer is online.
+static void pair_status_cb(meshlink_handle_t *mesh, meshlink_node_t *node, bool reachable) {
+ set_sync_flag(mesh->priv);
+}
+
+void start_meshlink_pair(meshlink_handle_t *a, meshlink_handle_t *b) {
+ struct sync_flag pair_status = {};
+
+ a->priv = &pair_status;
+ meshlink_set_node_status_cb(a, pair_status_cb);
+
+ pthread_mutex_lock(&pair_status.mutex);
+
+ meshlink_start(a);
+ meshlink_start(b);
+
+ assert(wait_sync_flag(&pair_status, 5));
+
+ pthread_mutex_unlock(&pair_status.mutex);
+
+ meshlink_set_node_status_cb(a, NULL);
+ a->priv = NULL;
+}
+
+void stop_meshlink_pair(meshlink_handle_t *a, meshlink_handle_t *b) {
+ meshlink_stop(a);
+ meshlink_stop(b);
+}
+
+void close_meshlink_pair(meshlink_handle_t *a, meshlink_handle_t *b, const char *prefix) {
+ meshlink_close(a);
+ meshlink_close(b);
+
+ if(prefix) {
+ char *a_name, *b_name;
+
+ asprintf(&a_name, "%s_conf.1", prefix);
+ assert(a_name);
+ assert(meshlink_destroy(a_name));
+
+ asprintf(&b_name, "%s_conf.2", prefix);
+ assert(b_name);
+ assert(meshlink_destroy(b_name));
+ }
+}