Sending a vector through zeromq with msgpack

I can't seem to send a `vector` of a `struct` that I serialized with msgpack through ZeroMQ. It's a vector of this struct: ``` struct MyData { MyData() : id(0), x(0), y(0), a(0) {} MyData(const Obj &r) : id(0), x(r.pose[0]), y(r.pose[1]), a(r.pose[2]) {} MyData(const Obj *r) : id(0), x(r->pose[0]), y(r->pose[1]), a(r->pose[2]) {} double id; double x; double y; double a; MSGPACK_DEFINE(id, x, y, a); }; ``` On the sending side: `data` is a `std::vector<MyData>` ``` msgpack::sbuffer sbuf; msgpack::pack(sbuf, data); zmq::message_t msg(sbuf.data(), sizeof(char *) * sbuf.size(), NULL, NULL); local_socket->send(msg); // this is just zeromq's send function ``` Did I construct my `sbuffer` or `message_t` wrong? On the receiving side: I'm not sure if I was supposed to cast the `msg.data()` or not but I can't find any good documentation on how to work with ZeroMQ and messagepack. ``` message_t msg; server_socket->recv(&msg); msgpack::unpacked unpacked; msgpack::unpack(&unpacked, reinterpret_cast<char*>(msg.data()), msg.size()); msgpack::object obj = unpacked.get(); std::vector<MyData> data; obj.convert(&data); printf("size %d\n", data.size()); ``` I get the following error: terminate called after throwing an instance of 'msgpack::type_error' what(): std::bad_cast Aborted I would appreciate any help.