Sending UDP package to Lifx and recvfrom - c++

Question

I am trying to send a broadcast UDP package to all my Lifx devices (wifi lamps). The devices should answer with another package to the same port I sent the first package from.
I am so far, that I see my sent broadcast package in wireshark. I also see the reply from the Lifx lamp.
But my program is stuck on recvfrom.
int sockfd;
struct sockaddr_in saddr_send, saddr_recv;
if ((sockfd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0 ) {
perror("socket creation failed");
exit(EXIT_FAILURE);
}
int one = 1;
if ((setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, (void*) &one, sizeof(one))) < 0 ) {
perror("set socket option failed");
exit(EXIT_FAILURE);
}
if ((setsockopt(sockfd, SOL_SOCKET, SO_BROADCAST, &one, sizeof(one))) < 0 ) {
perror("set socket option failed");
exit(EXIT_FAILURE);
}
memset(&saddr_send, 0, sizeof(saddr_send));
memset(&saddr_recv, 0, sizeof(saddr_recv));
// Filling dest information
saddr_send.sin_family = AF_INET; // IPv4
saddr_send.sin_addr.s_addr = INADDR_BROADCAST;
saddr_send.sin_port = htons(PORT);
// Filling source information
saddr_recv.sin_family = AF_INET; // IPv4
saddr_recv.sin_addr.s_addr = INADDR_ANY;
saddr_recv.sin_port = htons(PORT);
// Bind the socket with the server address
if (bind(sockfd, (const struct sockaddr *)&saddr_recv, sizeof(saddr_recv)) < 0 ) {
perror("bind failed");
exit(EXIT_FAILURE);
}
char buffer[BUFF_SIZE];
size_t length;
unsigned size = sizeof(saddr_recv);
char recvbuffer[BUFF_SIZE];
length = sendMessage->getEncodedHeader(buffer, BUFF_SIZE);
int e = sendto(sockfd, buffer, length, 0, (struct sockaddr*) &saddr_send, sizeof(saddr_send));
if (e < 0) {
printf("%i\n", errno);
perror("Send error: ");
}
unsigned int r = recvfrom(sockfd, (void*)&recvbuffer, sizeof(recvbuffer), 0, (struct sockaddr*)&saddr_recv, &size);
if (r < sizeof(lifx_protocol_header)) {
printf("package too short");
}
close(sockfd);
I am not sure if I made a conceptional mistake or if I am to slow with calling recvfrom.
Any idea on additional points I could try to solve my problem?