linguini1 opened a new issue, #16447:
URL: https://github.com/apache/nuttx/issues/16447
### Description / Steps to reproduce the issue
I am having some issues with TCP keep-alive on the W5500-EVB pico. Namely,
all the keep-alive socket options can be set nominally (no error from
`setsockopt`), but the connection does not reset after the keep-alive time. I
am testing this by setting up a connection successfully between two W5500-EVB
Picos, and then turning off the client EVB Pico and waiting for the timeout to
occur. The timeout never happens (blocking `recv` should return ECONNRESET as
it does on Linux, or at least some error code).
For testing, I am using 2 probes with an interval of 5 seconds.
This is the code I am using to setup the TCP socket:
```c
static int controller_init(controller_t *controller, uint16_t port) {
int err;
/* Initialize the socket connection. */
controller->sock = socket(AF_INET, SOCK_STREAM, 0);
if (controller->sock < 0) return errno;
int opt = 1;
err = setsockopt(controller->sock, SOL_SOCKET, SO_REUSEADDR, &opt,
sizeof(opt));
if (err < 0) {
herr("Failed to set option SO_REUSEADDR: %d\n", errno);
return errno;
}
/* Create address */
controller->addr.sin_family = AF_INET;
controller->addr.sin_addr.s_addr = INADDR_ANY;
controller->addr.sin_port = htons(port);
/* Make sure client socket fd is marked as invalid until it gets a
connection */
controller->client = -1;
if (bind(controller->sock, (struct sockaddr *)&controller->addr,
sizeof(controller->addr)) < 0) {
herr("Failed to bind\n");
return errno;
}
/* Set up keep-alive options */
int keepalive = 1;
err = setsockopt(controller->sock, SOL_SOCKET, SO_KEEPALIVE, (void
*)&keepalive, sizeof(keepalive));
if (err < 0) {
herr("Failed to set socket as keep-alive: %d.\n", errno);
return errno;
}
/* Each interval between ACK probes is `int_secs` long */
int int_secs = KEEPALIVE_INTERVAL_SECS;
err = setsockopt(controller->sock, IPPROTO_TCP, TCP_KEEPINTVL,
&int_secs, sizeof(int));
if (err < 0) {
herr("Failed to set keep-alive interval to %d: %d.\n", int_secs,
errno);
return errno;
}
hinfo("Set keep-alive interval %d s\n", int_secs);
int count = KEEPALIVE_N_PROBES; /* Gives 10 probes (10 * `int_secs`
seconds) to regain connection */
err = setsockopt(controller->sock, IPPROTO_TCP, TCP_KEEPCNT, &count,
sizeof(int));
if (err < 0) {
herr("Failed to set keep-alive probe count to %d: %d.\n", count,
errno);
return errno;
}
hinfo("Set number of keep-alive probes: %d\n", count);
return 0;
}
```
And here is the code where I expect to see the timeout:
```c
// controller->client is the `accept`-ed client connection fd
bread = recv(controller->client, (char *)&hdr + total_read, sizeof(hdr) -
total_read, 0);
if (bread == -1) {
herr("Error reading message header: %s\n", strerror(errno));
if (errno == ECONNRESET) {
// TODO: this should trigger an abort because it happens when TCP
keep-alive is done
herr("Lost connection! ABORT!\n");
}
break;
} else if (bread == 0) {
herr("Control box disconnected.\n");
break;
}
total_read += bread;
```
I have also used Wireshark to listen to the network traffic being sent and I
am unable to see any of the probes being sent at all.
### On which OS does this issue occur?
[OS: Linux]
### What is the version of your OS?
Linux 6.14.7-arch2-1 SMP PREEMPT_DYNAMIC Thu, 22 May 2025 05:37:49 +0000
x86_64 GNU/Linux
### NuttX Version
master
### Issue Architecture
[Arch: arm]
### Issue Area
[Area: Networking]
### Host information
_No response_
### Verification
- [x] I have verified before submitting the report.
--
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
To unsubscribe, e-mail: commits-unsubscr...@nuttx.apache.org.apache.org
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
