NB-IoT sim card configuration on NRF9160 DK

[lunaa]

Hello,

I'm working on the mqtt_simple sample in zephyr environment for NRF9160 board.

We tested the firmware with 2 sim cards with different packets: IPv4 and IPv6, both supports NB-IoT.  However, the one with IPv6 cannot be configured to network due to Timeout Error -60, using the same source code as the IPv4. 

Do we need to change the configuration when we switch from IPv4 to IPv6?

Thank you.

[Heidi]

Hi!

So it doesn't look like the MQTT Simple sample has support for IPv6. 

You can modify the sample L319  - L334 in main.c to something like this.

struct sockaddr_in6 *broker6 =
	((struct sockaddr_in6 *)&broker);
char ipv6_addr[NET_IPV6_ADDR_LEN];

broker6->sin6_addr.s6_addr =
	((struct sockaddr_in6 *)addr->ai_addr)
	->sin6_addr.s6_addr;
broker6->sin6_family = AF_INET6;
broker6->sin6_port = htons(CONFIG_MQTT_BROKER_PORT);

inet_ntop(AF_INET6, &broker6->sin6_addr.s6_addr,
	  ipv6_addr, sizeof(ipv6_addr));
printk("IPv6 Address found %s\n", ipv6_addr);
break;

If you want to use the same sample for both IPv4 and IPv6, you can use a switch case as they've done in supl_support c (line 90). 

So something like this

switch (sa->sa_family) {
case AF_INET6:
	struct sockaddr_in6 *broker6 =
		((struct sockaddr_in6 *)&broker);
	char ipv6_addr[NET_IPV6_ADDR_LEN];

	broker6->sin6_addr.s6_addr =
		((struct sockaddr_in6 *)addr->ai_addr)
		->sin6_addr.s6_addr;
	broker6->sin6_family = AF_INET6;
	broker6->sin6_port = htons(CONFIG_MQTT_BROKER_PORT);

	inet_ntop(AF_INET6, &broker6->sin6_addr.s6_addr,
		  ipv6_addr, sizeof(ipv6_addr));
	printk("IPv6 Address found %s\n", ipv6_addr);
	break;
case AF_INET:
	struct sockaddr_in *broker4 =
		((struct sockaddr_in *)&broker);
	char ipv4_addr[NET_IPV4_ADDR_LEN];

	broker4->sin_addr.s_addr =
		((struct sockaddr_in *)addr->ai_addr)
		->sin_addr.s_addr;
	broker4->sin_family = AF_INET;
	broker4->sin_port = htons(CONFIG_MQTT_BROKER_PORT);

	inet_ntop(AF_INET, &broker4->sin_addr.s_addr,
		  ipv4_addr, sizeof(ipv4_addr));
	printk("IPv4 Address found %s\n", ipv4_addr);
	break;
}	

Let me know how that goes!

Best regards,

Heidi