Connecting an nRF9160 to AWS

[MJD093]

Hello,

I'm attempting to connect the nRF9160 DK to our AWS IoT account. I've been following the information in this question: https://devzone.nordicsemi.com/f/nordic-q-a/44528/switch-cloud-endpoint-from-nordic-aws-to-our-own-aws-account but I'm having an issue establishing the connection.

So far I have been able to call the certificates from a replica of 'certificates.h' and flash these onto the nRF91 using the nrf_inbuilt_key commands and have been able to establish a broker connection but receive a time out error when connecting to AWS with MQTT. I am currently modifying mqtt_simple to acheve this connection.

So far I have updated 'pj.conf' with:

# General config
CONFIG_TEST_RANDOM_GENERATOR=y

# Networking
CONFIG_NETWORKING=y
CONFIG_NET_SOCKETS_OFFLOAD=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y

# LTE link control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n
CONFIG_NRF_CLOUD_PROVISION_CERTIFICATES=y

# BSD library
CONFIG_BSD_LIBRARY=y

# AT Host
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_AT_HOST_LIBRARY=y

# MQTT
CONFIG_MQTT_LIB=y
CONFIG_MQTT_LIB_TLS=y

# Appliaction
CONFIG_MQTT_PUB_TOPIC="my/publish/topic"
CONFIG_MQTT_SUB_TOPIC="my/subscribe/topic"
CONFIG_MQTT_CLIENT_ID="MQTT_TEST"
CONFIG_MQTT_BROKER_HOSTNAME="xxxxxxxxxxx.iot.eu-west-1.amazonaws.com" (redacted)
CONFIG_MQTT_BROKER_PORT=8883
CONFIG_NRF_CLOUD_SEC_TAG=1234

# Main thread
CONFIG_MAIN_THREAD_PRIORITY=7
CONFIG_MAIN_STACK_SIZE=4096

CONFIG_HEAP_MEM_POOL_SIZE=1024

I have added the following additional functions to mqtt_simple:

#include "certificates.h"

#define NRF_CLOUD_HOSTNAME CONFIG_MQTT_BROKER_HOSTNAME
#define NRF_CLOUD_SEC_TAG CONFIG_NRF_CLOUD_SEC_TAG

static struct nct {
	struct mqtt_sec_config tls_config;
	struct mqtt_client client;
	struct sockaddr_storage broker;
	struct mqtt_utf8 dc_tx_endp;
	struct mqtt_utf8 dc_rx_endp;
	u32_t message_id;
} nct;

static void client_init(struct mqtt_client *client)
{
	mqtt_client_init(client);

	broker_init();

	/* MQTT client configuration */
	client->broker = &broker;
	client->evt_cb = mqtt_evt_handler;
	client->client_id.utf8 = (u8_t *)CONFIG_MQTT_CLIENT_ID;
	client->client_id.size = strlen(CONFIG_MQTT_CLIENT_ID);
	client->password = NULL;
	client->user_name = NULL;
	client->protocol_version = MQTT_VERSION_3_1_1;

	/* MQTT buffers configuration */
	client->rx_buf = rx_buffer;
	client->rx_buf_size = sizeof(rx_buffer);
	client->tx_buf = tx_buffer;
	client->tx_buf_size = sizeof(tx_buffer);

	nct.client.transport.type = MQTT_TRANSPORT_SECURE;

	struct mqtt_sec_config *tls_config = &nct.client.transport.tls.config;

	memcpy(tls_config, &nct.tls_config, sizeof(struct mqtt_sec_config));
}

static int nct_provision(void)
{
    printk("nct provisions active\n");
    
    static sec_tag_t sec_tag_list[] = {NRF_CLOUD_SEC_TAG};
    
    nct.tls_config.peer_verify = 2;
    nct.tls_config.cipher_count = 0;
    nct.tls_config.cipher_list = NULL;
    nct.tls_config.sec_tag_count = ARRAY_SIZE(sec_tag_list);
    nct.tls_config.sec_tag_list = sec_tag_list;
    nct.tls_config.hostname = CONFIG_MQTT_BROKER_HOSTNAME;
    
    
    int err;
    
    printk("BSD and Cloud provisions defined\n");
    /* Delete certificates */
    nrf_sec_tag_t sec_tag = NRF_CLOUD_SEC_TAG;
    
    for (nrf_key_mgnt_cred_type_t type = 0; type < 5; type++) {
    	err = nrf_inbuilt_key_delete(sec_tag, type);
    	printk("nrf_inbuilt_key_delete(%d, %d) => result=%d\n",
    		sec_tag, type, err);
    }
    err = nrf_inbuilt_key_delete(0,0);
    printk("nrf_inbuilt_key_delete(0, 0) => result=%d\n",
    	err);
    /* Provision CA Certificate. */
    err = nrf_inbuilt_key_write(NRF_CLOUD_SEC_TAG,
    			NRF_KEY_MGMT_CRED_TYPE_CA_CHAIN,
    			NRF_CLOUD_CA_CERTIFICATE,
    			strlen(NRF_CLOUD_CA_CERTIFICATE));
    printk("nrf_inbuilt_key_write(%d, root-CA => result=%d)\n",
    	NRF_CLOUD_SEC_TAG, err);
    if (err) {
    	printk("NRF_CLOUD_CA_CERTIFICATE err: %d", err);
    	return err;
    }
    
    /* Provision Private Certificate. */
    err = nrf_inbuilt_key_write(
    	NRF_CLOUD_SEC_TAG,
    	NRF_KEY_MGMT_CRED_TYPE_PRIVATE_CERT,
    	NRF_CLOUD_CLIENT_PRIVATE_KEY,
    	strlen(NRF_CLOUD_CLIENT_PRIVATE_KEY));
    	printk("nrf_inbuilt_key_write(%d, Private Key => result=%d)\n",
    		NRF_CLOUD_SEC_TAG, err);
    if (err) {
    	printk("NRF_CLOUD_CLIENT_PRIVATE_KEY err: %d", err);
    	return err;
    }
    
    /* Provision Public Certificate. */
    err = nrf_inbuilt_key_write(
    	NRF_CLOUD_SEC_TAG,
    	NRF_KEY_MGMT_CRED_TYPE_PUBLIC_CERT,
    	NRF_CLOUD_CLIENT_PUBLIC_CERTIFICATE,
    	strlen(NRF_CLOUD_CLIENT_PUBLIC_CERTIFICATE));
    	printk("nrf_inbuilt_key_write(%d, Public Cert => result=%d)\n",
    		NRF_CLOUD_SEC_TAG, err);
    if (err) {
    	printk("NRF_CLOUD_CLIENT_PUBLIC_CERTIFICATE err: %d",
    		err);
    	return err;
    }
    return 0;
}

void main(void)
{
	int err;
	int err_provision;
	printk("The MQTT simple sample started\n");

 	err_provision = nct_provision();
	if (err_provision != 0) {
		printk("ERROR: nct_provision failure %d\n", err_provision);
		return;
	}
	printk("err_provision = %d\n", err_provision);
	modem_configure();

	client_init(&client);

I have changed the following in Kconfig:

menu "MQTT simple sample"
config MQTT_PUB_TOPIC
	string "MQTT publish topic"
	default "my/publish/topic"

config MQTT_SUB_TOPIC
	string "MQTT subscribe topic"
	default "my/subscribe/topic"

config MQTT_CLIENT_ID
	string "MQTT Client ID"
	default "MQTT_TEST"

config MQTT_BROKER_HOSTNAME
	string "MQTT broker hostname"
	default "xxxxxxxxx.iot.eu-west-1.amazonaws.com" (redacted)

config MQTT_BROKER_PORT
	int "MQTT broker port"
	default 8883

config MQTT_MESSAGE_BUFFER_SIZE
	int ""
	default 128

config MQTT_PAYLOAD_BUFFER_SIZE
	int ""
	default 128

config NRF_CLOUD_SEC_TAG
	int ""
	default 1234

Finally, the certs are inside certificates.h:

/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: BSD-5-Clause-Nordic
 */

#define NRF_CLOUD_CLIENT_ID "MQTT_TEST"

#define NRF_CLOUD_CLIENT_PRIVATE_KEY \
	"-----BEGIN RSA PRIVATE KEY-----\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"-----END RSA PRIVATE KEY-----\r\n"

#define NRF_CLOUD_CLIENT_PUBLIC_CERTIFICATE \
	"-----BEGIN CERTIFICATE-----\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"-----END CERTIFICATE-----\r\n"

#define NRF_CLOUD_CA_CERTIFICATE \
	"-----BEGIN CERTIFICATE-----\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"xxxxxxx\r\n" \
	"-----END CERTIFICATE-----\r\n"

I'm not sure what is still left to change in order to make the connection to AWS.

[Håkon Alseth]

Hi,

 

You are using \r\n as the line ending (normal is \n only), but both shall be accepted by the nrf_inbuilt API.

I do not see any problems specific to your implementation, but what you could do is to verify that you have the latest modem installed, which can be found here:

https://www.nordicsemi.com/Products/Low-power-cellular-IoT/nRF9160/Download#infotabs

 

Do you always get the same error message, even if you try several times? if you enter debug mode, and debug the function mqtt_transport_socket_tls.c::mqtt_client_tls_connect(), which function returns the err?

 

Kind regards,

Håkon

[MJD093]

Apologises for the delayed response. I have identified the issue with the connection. Turns out the network provider requires a whitelisted IP address that is incompatible with the dynamic IPs of AWS IoT Core.

As the device I am using is deployed in another area of the UK, I can't manually update the modem to the latest version without risking something going wrong. I'd rather avoid updating the modem at this moment if I can get away with it. The device is hooked up to a Raspberry Pi with internet access which can faciliate re-flashing with JLinkExe but hasn't been set up with the modem update tools.

I've been busy figuring out a counter to this issue and have decided to take a different path and use the BSD library to create a UDP connection to a static IP bounded EC2 instance on AWS. I have encountered a different problem with setting up this kind of connection however.

The code compiles but the nRF9160 reports back a hard fault when the code is loaded onto the device. It will run the code until the UDP IPv4 socket information structure (struct nrf_sockaddr_in) is populated. I've tried to follow what examples I have found of this structure in the ncs repo but I seem to be missing something.

This is were it appears the code gets to before hard fault, I placed printks to figure out where the code reaches before faulting:

/**@brief Configures modem to test connection. Blocks until link is
 * successfully established. Creates a UDP socket and connects to
 * AWS EC2 instance
 */
static int UDP_Socket_Config_and_Connect(void)
{
	int err;
	int UDP_Socket;

	// Sets up UDP Socket information
	struct nrf_sockaddr_in *UDP_sockaddr;
			printk("code checkpoint 0\n");
	UDP_sockaddr->sin_len 					=		sizeof(struct nrf_sockaddr_in);			/**< Length of this data structure */
			printk("code checkpoint 1\n");
	UDP_sockaddr->sin_port					=		NRF_HTONS(xxxxx);              	        /**< Port, in network byte order */
			printk("code checkpoint 2\n");
	UDP_sockaddr->sin_family 				=		NRF_AF_INET;            				/**< Socket family, IPv4 socket */
			printk("code checkpoint 3\n");
	UDP_sockaddr->sin_addr.s_addr	    	= 	    0xXXXXXXXX;							    /**< IPv4 address, in hex format */
			printk("code checkpoint 4\n");

	UDP_Socket = nrf_socket(NRF_AF_LTE, NRF_SOCK_DGRAM, NRF_IPPROTO_UDP); //Opens UDP socket using UDP protocols
	if (UDP_Socket == -1) {
		printk("Socket failed to open\n");
		return -EFAULT;
	}
	printk("Socket created for init\n");

	err = nrf_connect(UDP_Socket, UDP_sockaddr, UDP_sockaddr->sin_len); //Tests connection to UDP IPv4 address
	if(err)
	{
		printk("Failure to establish connection via nrf_connect, closing socket\n");
		close(UDP_Socket);
	}
	close(UDP_Socket);
	printk("Config and Connect Successful\n");
	return err;
}

This is the UART information when the device resets until faulting:

Flash region		Domain		Permissions
00 0x00000 0x02000 	Secure		rwxl
01 0x02000 0x04000 	Non-Secure	rwxl
02 0x04000 0x06000 	Non-Secure	rwxl
03 0x06000 0x08000 	Non-Secure	rwxl
04 0x08000 0x0a000 	Non-Secure	rwxl
05 0x0a000 0x0c000 	Non-Secure	rwxl
06 0x0c000 0x0e000 	Non-Secure	rwxl
07 0x0e000 0x10000 	Non-Secure	rwxl
08 0x10000 0x12000 	Non-Secure	rwxl
09 0x12000 0x14000 	Non-Secure	rwxl
10 0x14000 0x16000 	Non-Secure	rwxl
11 0x16000 0x18000 	Non-Secure	rwxl
12 0x18000 0x1a000 	Non-Secure	rwxl
13 0x1a00ecure	rwxl
14 0x1c000 0x1e000 	Non-Secure	rwxl
15 0x1e000 0x20000 	Non-Secure	rwxl
16 0x20000 0x22000 	Non-Secure	rwxl
17 0x22000 0x24000 	Non-Secure	rwxl
18 0x24000 0x26000 	Non-Secure	rwxl
19 0x26000 0x28000 	Non-Secure	rwxl
20 0x28000 0x2a000 	Non-Secure	rwxl
21 0x2a000 0x2c000 	Non-Secure	rwxl
22 0x2c000 0x2e000 	Non-Secure	rwxl
23 0x2e000 0x30000 	Non-Secure	rwxl
24 0x30000 0x32000 	Non-Secure	rwxl
25 0x32000 0x34000 	Non-Secure	rwxl
26 0x34000 0x36000 	Non-Secure	rwxl
27 0x36000 0x38000 	Non-Secure	rwxl
28 0x38000 0x3a000 	Non-Secure	rwxl
29 0x3a000 0x3c000 	Non-Secure	rwxl
30 0x3c000 0x3e000 	Non-Secure	rwxl
31 0x3e000 0x40000 	Non-Secure	rwxl

SRAM region		Domain		Permissions
00 0x00000 0x01000	Secure		rwxl
01 0x01000 0x02000	Secure		rwxl
02 0x02000 0x03000	Secure		rwxl
03 0x03000 0x04000	Secure		rwxl
04 0x04000 0x05000	Secure		rwxl
05 0x05000 0x06000	Secure		rwxl
06 0x06000 0x07000	Secure		rwxl
07 0x07000 0x08000	Secure		rwxl
08 0x08000 0x09000	Non-Secure	rwxl
09 0x09000 0x0a000	Non-Secure	rwxl
10 0x0a000 0x0b000	Non-Secure	rwxl
11 0x0b000 0x0c000	Non-Secure	rwxl
12 0x0c000 0x0d000	Non-Secure	rwxl
13 0x0d000 0x0e000	Non-Secure	rwxl
14 0x0e000 0x0f000	Non-Secure	rwxl
15 0x0f000 0x10000	Non-Secure	rwxl
16 0x10000 0x11000	Non-Secure	rwxl
17 0x11000 0x12000	Non-Secure	rwxl
18 0x12000 0x13000	Non-Secure	rwxl
19 0x13000 0x14000	Non-Secure	rwxl
20 0x14000 0x15000	Non-Secure	rwxl
21 0x15000 0x16000	Non-Secure	rwxl
22 0x16000 0x17000	Non-Secure	rwxl
23 0x17000 0x18000	Non-Secure	rwxl
24 0x18000 0x19000	Non-Secure	rwxl
25 0x19000 0x1a000	Non-Secure	rwxl
26 0x1a000 0x1b000	Non-Secure	rwxl
27 0x1b000 0x1c000	Non-Secure	rwxl
28 0x1c000 0x1d000	Non-Secure	rwxl
29 0x1d000 0x1e000	Non-Secure	rwxl
30 0x1e000 0x1f000	Non-Secure	rwxl
31 0x1f000 0x20000	Non-Secure	rwxl

Peripheral		Domain		Status
00 NRF_P0		Non-Secure	OK
01 NRF_CLOCK		Non-Secure	OK
02 NRF_RTC1		Non-Secure	OK
03 NRF_NVMC		Non-Secure	OK
04 NRF_UARTE1		Non-Secure	OK
05 NRF_UARTE2		Secure		SKIP
06 NRF_IPC		Non-Secure	OK
07 NRF_VMC		Non-Secure	OK
08 NRF_FPU		Non-Secure	ERROR
09 NRF_EGU1		Non-Secure	OK
10 NRF_EGU2		Non-Secure	OK
11 NRF_TWIM2		Non-Secure	OK
12 NRF_SPIM3		Non-Secure	OK
13 NRF_TIMER0		Non-Secure	OK
14 NRF_TIMER1		Non-Secure	OK
15 NRF_TIMER2		Non-Secure	OK
16 NRF_SAADC		Non-Secure	OK
17 NRF_GPIOTE1		Non-Secure	OK

SPM: MSP_NS 20022e00
SPM: prepare to jump to Non-Secure image
***** Booting Zephyr OS v1.13.99-ncs1-6044-g4eaddb50e90b *****
UDP_Test Application started
code checkpoint 0
Exception occurred in Secure State
***** HARD FAULT *****
  Fault escalation (see below)
***** BUS FAULT *****
  Precise data bus error
  BFAR Address: 0x50008120
***** Hardware exception *****
Current thread ID = 0x20020150
Faulting instruction address = 0x93da
Fatal fault in ISR! Spinning...

This is main.c

/*
 * Copyright (c) 2018 Nordic Semiconductor ASA
 *
 * SPDX-License-Identifier: LicenseRef-BSD-5-Clause-Nordic
 */

#include <zephyr.h>
#include <stdio.h>
#include <uart.h>
#include <string.h>

//#include "certificates.h"
//#include "provisions/provision.h"
#include "../../../../../nrfxlib/bsdlib/include/nrf_socket.h"

#if defined(CONFIG_BSD_LIBRARY)

/**@brief Recoverable BSD library error. */
void bsd_recoverable_error_handler(uint32_t err)
{
	printk("bsdlib recoverable error: %u\n", err);
}

/**@brief Irrecoverable BSD library error. */
void bsd_irrecoverable_error_handler(uint32_t err)
{
	printk("bsdlib irrecoverable error: %u\n", err);

	__ASSERT_NO_MSG(false);
}

#endif /* defined(CONFIG_BSD_LIBRARY) */

// #if defined(CONFIG_BSD_LIBRARY) //Includes nrf secure key manager code, not impliment yet
// #include "nrf_inbuilt_key.h"
// #endif

/**@brief Configures modem to test connection. Blocks until link is
 * successfully established. Creates a UDP socket and connects to
 * AWS EC2 instance
 */
static int UDP_Socket_Config_and_Connect(void)
{
	int err;
	int UDP_Socket;

	// Sets up UDP Socket information
	struct nrf_sockaddr_in *UDP_sockaddr;
			printk("code checkpoint 0\n");
	UDP_sockaddr->sin_len 					=		sizeof(struct nrf_sockaddr_in);						/**< Length of this data structure */
			printk("code checkpoint 1\n");
	UDP_sockaddr->sin_port					=		NRF_HTONS(xxxxx);              	/**< Port, in network byte order */
			printk("code checkpoint 2\n");
	UDP_sockaddr->sin_family 				=		NRF_AF_INET;            				/**< Socket family, IPv4 socket */
			printk("code checkpoint 3\n");
	UDP_sockaddr->sin_addr.s_addr		= 	0xXXXXXXXX;											/**< IPv4 address, in hex format */
			printk("code checkpoint 4\n");

	UDP_Socket = nrf_socket(NRF_AF_LTE, NRF_SOCK_DGRAM, NRF_IPPROTO_UDP); //Opens UDP socket using UDP protocols
	if (UDP_Socket == -1) {
		printk("Socket failed to open\n");
		return -EFAULT;
	}
	printk("Socket created for init\n");

	err = nrf_connect(UDP_Socket, UDP_sockaddr, UDP_sockaddr->sin_len); //Tests connection to UDP IPv4 address
	if(err)
	{
		printk("Failure to establish connection via nrf_connect, closing socket\n");
		close(UDP_Socket);
	}
	close(UDP_Socket);
	printk("Config and Connect Successful\n");
	return err;
}

/**@brief Sends a test UDP packet to AWS. Uses non-blocking mode. */

static int UDP_Send(const char *UDP_buff)
{
	int err;
	int UDP_Socket;

	struct nrf_sockaddr_in *UDP_sockaddr;
	UDP_sockaddr->sin_family =		NRF_AF_INET;            				/**< Socket family. */
	UDP_sockaddr->sin_port		=		NRF_HTONS(xxxxx);              	/**< Port, in network byte order. */
	UDP_sockaddr->sin_addr.s_addr		= 	0xXXXXXXXX;								/**< IPv4 address. */
	UDP_sockaddr->sin_len 		=		sizeof(struct nrf_sockaddr_in);						/**< Length of this data structure. */

	UDP_Socket = nrf_socket(NRF_AF_LTE, NRF_SOCK_DGRAM, NRF_IPPROTO_UDP);
	if (UDP_Socket == -1) {
		printk("Socket failed to open\n");
		return -EFAULT;
	}
	printk("Socket created for transfer\n");

	err = nrf_connect(UDP_Socket, UDP_sockaddr, UDP_sockaddr->sin_len);
	if(err)
	{
		printk("Failure to establish connection via nrf_connect, closing socket\n");
		close(UDP_Socket);
	}
	printk("Send socket connected\n");
	return err;

	err = nrf_send(UDP_Socket, UDP_buff, strlen(UDP_buff), NRF_MSG_DONTWAIT); //Sends UDP Buffer to AWS EC2 with non-blocking flag
	if (err)
	{
		printk("Error sending %s to IP %08x\n", UDP_buff, UDP_sockaddr->sin_addr.s_addr);
		close(UDP_Socket);
	}
	printk("Sent %s to IP %08x\n", UDP_buff, UDP_sockaddr->sin_addr.s_addr);
}

void main(void)
{
	printk("UDP_Test Application started\n");

	const char Buff[] = "Hello World\n";

	//Set up Zephyr 10 second timer that will call UDP_Send
	struct k_timer my_timer;
	void my_work_handler(struct k_timer *timer_1)
	{
		UDP_Send(Buff);
		printk("timer triggered!\n");
	}

	UDP_Socket_Config_and_Connect(); //Test UDP connection

	//Initialize and activate timer
	k_timer_init(&my_timer, my_work_handler, NULL);
	k_timer_start(&my_timer, K_SECONDS(10), K_SECONDS(10));

	while(true)
	{
		k_sleep(K_MSEC(10));
		/* Put CPU to idle to save power */
		k_cpu_idle();
	}
}

EDIT: I should clarify, I have one DK deployed in an area of NB-IoT coverage that can be re-flashed remotely. I have a second DK beside me that I can use to test flashes operate as expected, but without any NB-IoT coverage in this area, before taking the merged zephyr hex file and remotely flashing using JLinkExe.

[Håkon Alseth]

Hi,

 

This code looks like trouble:

struct nrf_sockaddr_in *UDP_sockaddr;
printk("code checkpoint 0\n");
UDP_sockaddr->sin_len 					=		sizeof(struct nrf_sockaddr_in);			/**< Length of this data structure */
printk("code checkpoint 1\n");
UDP_sockaddr->sin_port					=		NRF_HTONS(xxxxx);              	        /**< Port, in network byte order */
printk("code checkpoint 2\n");
UDP_sockaddr->sin_family 				=		NRF_AF_INET;            				/**< Socket family, IPv4 socket */
printk("code checkpoint 3\n");
UDP_sockaddr->sin_addr.s_addr	    	= 	    0xXXXXXXXX;							    /**< IPv4 address, in hex format */
printk("code checkpoint 4\n");

 

Could you try this instead?

struct nrf_sockaddr_in my_sockaddr; // memset if not populating everything
struct nrf_sockaddr_in *UDP_sockaddr = &my_sockaddr;
printk("code checkpoint 0\n");
UDP_sockaddr->sin_len 					=		sizeof(struct nrf_sockaddr_in);			/**< Length of this data structure */
printk("code checkpoint 1\n");
UDP_sockaddr->sin_port					=		NRF_HTONS(xxxxx);              	        /**< Port, in network byte order */
printk("code checkpoint 2\n");
UDP_sockaddr->sin_family 				=		NRF_AF_INET;            				/**< Socket family, IPv4 socket */
printk("code checkpoint 3\n");
UDP_sockaddr->sin_addr.s_addr	    	= 	    0xXXXXXXXX;							    /**< IPv4 address, in hex format */
printk("code checkpoint 4\n");

 

Kind regards,

Håkon

[MJD093]

Hi,

Thank you, that allowed the code to pass through the struct without faulting.

I have tweeked the code slightly as the timer was causing an instruction fault (first time I've seen that as I use that timer code in other Zephyr nrf91 samples, I have removed it for now as it wasn't really needed). I have edited nrf_connect as even though there was no network for it to connect to, it was still returning 0 on err.

Is this the correct way for nrf_connect to be called? It now fails out as expected for no network connection.

/**@brief Configures modem to test connection. Blocks until link is
 * successfully established. Creates a UDP socket and connects to
 * AWS EC2 instance
 */
static int UDP_Socket_Config_and_Connect(void)
{
	int err;
	int UDP_Socket;

	// Sets up UDP Socket information
	struct nrf_sockaddr_in my_sockaddr; // memset if not populating everything
	struct nrf_sockaddr_in *UDP_sockaddr = &my_sockaddr;

	UDP_sockaddr->sin_len 					=		sizeof(struct nrf_sockaddr_in);			/**< Length of this data structure */
	UDP_sockaddr->sin_port					=		NRF_HTONS(xxxxx);              	        /**< Port, in network byte order */
	UDP_sockaddr->sin_family 				=		NRF_AF_INET;            				/**< Socket family, IPv4 socket */
	UDP_sockaddr->sin_addr.s_addr	  = 	0xXXXXXXXX;							    /**< IPv4 address, in hex format */

	UDP_Socket = nrf_socket(NRF_AF_INET, NRF_SOCK_DGRAM, NRF_IPPROTO_UDP); //Opens UDP socket using UDP protocols
	if (UDP_Socket == -1) {
		printk("Socket failed to open\n");
		return -EFAULT;
	}
	printk("Socket created for init\n");

	err = nrf_connect(UDP_Socket, (struct sockaddr *)&UDP_sockaddr, sizeof(UDP_sockaddr)); //Tests connection to UDP IPv4 address
	if(err < 0)
	{
		printk("Failure to establish connection via nrf_connect, closing socket\n");
		nrf_close(UDP_Socket);
		return err;
	}
	nrf_close(UDP_Socket);
	printk("Config and Connect Successful\n");
	return err;
}

[Håkon Alseth]

Hi,

 

The code looks ok. I have an udp-example here (the bind is strictly not needed):

https://github.com/Rallare/fw-nrfconnect-nrf/blob/nrf9160_samples/samples/nrf9160/ntp/src/main.c

Kind regards,

Håkon