// 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) {
// 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) {