Testing UDP sample with sdk 1.7.0 I can't detect errors if the packet is not sent.
After a connection to networks and a few well-delivered packets, I put the device in a shield room with no network coverage. The send() function continues to return the number of characters sent normally even if no packet is actually received.
I expect the modem to detect transmission errors, but send() doesn't seem to be able to forward them.
How can I detect the transmission error?
static void server_transmission_work_fn(struct k_work *work)
{
int err;
char buffer[CONFIG_UDP_DATA_UPLOAD_SIZE_BYTES] = {"\0"};
printk("Transmitting UDP/IP payload of %d bytes to the ",
CONFIG_UDP_DATA_UPLOAD_SIZE_BYTES + UDP_IP_HEADER_SIZE);
printk("IP address %s, port number %d\n",
CONFIG_UDP_SERVER_ADDRESS_STATIC,
CONFIG_UDP_SERVER_PORT);
err = send(client_fd, buffer, sizeof(buffer), 0);
if (err < 0) {
printk("Failed to transmit UDP packet, %d\n", errno);
return;
}
k_work_schedule(&server_transmission_work,
K_SECONDS(CONFIG_UDP_DATA_UPLOAD_FREQUENCY_SECONDS));
}
