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net: mqtt: Allow to bind client to a specific interface

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Add a new "if_name" pointer to the transport configuration structure,
allowing the application to bind MQTT client to a specific network
interface.

Signed-off-by: Robert Lubos <robert.lubos@nordicsemi.no>
This commit is contained in:
Robert Lubos 2025-06-06 15:08:10 +02:00 • committed by Dan Kalowsky
commit 35af68b840
3 changed files with 43 additions and 2 deletions
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5
include/zephyr/net/mqtt.h
View file

@ -809,6 +809,11 @@ struct mqtt_transport {
*/
enum mqtt_transport_type type;
/** Name of the interface that the MQTT client instance should be bound to.
* Leave as NULL if not specified.
*/
const char *if_name;
/** Use either unsecured TCP or secured TLS transport */
union {
/** TCP socket transport for MQTT */

22
subsys/net/lib/mqtt/mqtt_transport_socket_tcp.c
View file

@ -29,6 +29,26 @@ int mqtt_client_tcp_connect(struct mqtt_client *client)
return -errno;
}
NET_DBG("Created socket %d", client->transport.tcp.sock);
if (client->transport.if_name != NULL) {
struct ifreq ifname = { 0 };
strncpy(ifname.ifr_name, client->transport.if_name,
sizeof(ifname.ifr_name) - 1);
ret = zsock_setsockopt(client->transport.tcp.sock, SOL_SOCKET,
SO_BINDTODEVICE, &ifname,
sizeof(struct ifreq));
if (ret < 0) {
NET_ERR("Failed to bind ot interface %s error (%d)",
ifname.ifr_name, -errno);
goto error;
}
NET_DBG("Bound to interface %s", ifname.ifr_name);
}
#if defined(CONFIG_SOCKS)
if (client->transport.proxy.addrlen != 0) {
ret = setsockopt(client->transport.tcp.sock,
@ -41,8 +61,6 @@ int mqtt_client_tcp_connect(struct mqtt_client *client)
}
#endif
NET_DBG("Created socket %d", client->transport.tcp.sock);
size_t peer_addr_size = sizeof(struct sockaddr_in6);
if (broker->sa_family == AF_INET) {

18
subsys/net/lib/mqtt/mqtt_transport_socket_tls.c
View file

@ -32,6 +32,24 @@ int mqtt_client_tls_connect(struct mqtt_client *client)
NET_DBG("Created socket %d", client->transport.tls.sock);
if (client->transport.if_name != NULL) {
struct ifreq ifname = { 0 };
strncpy(ifname.ifr_name, client->transport.if_name,
sizeof(ifname.ifr_name) - 1);
ret = zsock_setsockopt(client->transport.tls.sock, SOL_SOCKET,
SO_BINDTODEVICE, &ifname,
sizeof(struct ifreq));
if (ret < 0) {
NET_ERR("Failed to bind ot interface %s error (%d)",
ifname.ifr_name, -errno);
goto error;
}
NET_DBG("Bound to interface %s", ifname.ifr_name);
}
#if defined(CONFIG_SOCKS)
if (client->transport.proxy.addrlen != 0) {
ret = setsockopt(client->transport.tls.sock,