I’ve been learning (still feel very newbie-like) by taking the blinky example and putting in some LTE connectivity from the tracker sample as well as the http_get samples. It seems to work - The first 7 requests get made and the board sleeps for the defined time. However, completely consistently, on the 8th request, I can no longer get information from the modem, and getaddr fails. I try to catch this and deinit and init the modem, but it just stalls.
Sample log:
Loop 7... Reset count = 0
APN: nbiot.tdc.dk
IP Addr: 10.255.64.247
Signal Strength: 55
Preparing HTTP GET request for http://postman-echo.com:80/get?foo1=bar1&foo2=bar2
getaddrinfo status: 0
addrinfo @0x2000f5d0: ai_family=1, ai_socktype=1, ai_protocol=6, sa_family=1, sin_port=5000
sock = 0
Response:
HTTP/1.1 200 OK
Date: Thu, 24 Nov 2022 21:27:20 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 244
Connection: close
ETag: W/"f4-H5xxJO6rN9uh4r3dp5C0I+E6s1k"
Vary: Accept-Encoding
set-cookie: sails.sid=s%3AhXnBAGixP9uTLQrzNk43YXlhmfZ5yhJx.845%2BVWlJYvsJcT7DmQy1xEgZVieJ9DMJ5gcMZxLv7I8; Path=/; HttpOnly
{"args":{"foo1":"bar1","foo2":"bar2"},"headers":{"x-forwarded-proto":"http","x-forwarded-port":"80","host":"postman-echo.com","x-amzn-trace-id":"Root=1-637fe1b8-03ef660e2daf2e171a89f538"},"url":"http://postman-echo.com/get?foo1=bar1&foo2=bar2"}
Sleeping
Loop 8... Reset count = 0
APN: Error -22
IP Addr: Error -22
Signal Strength: 55
Preparing HTTP GET request for http://postman-echo.com:80/get?foo1=bar1&foo2=bar2
getaddrinfo status: -10
Unable to resolve address
Restarting modem
Deinit
Init
Done restarting modem
Loop 9... Reset count = 1
Starting network...
main.c:
/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <device.h>
#include <devicetree.h>
#include <drivers/gpio.h>
#include <modem/lte_lc.h>
#include <modem/modem_info.h>
#include <date_time.h>
#include <posix/time.h>
#include <posix/sys/time.h>
#include <net/socket.h>
#include <kernel.h>
/* 1000 msec = 1 sec */
#define SLEEP_TIME_MS 5000
/* Imei */
static char imei[20];
/* The devicetree node identifier for the "led0" alias. */
#define LED0_NODE DT_ALIAS(led0)
#if DT_NODE_HAS_STATUS(LED0_NODE, okay)
#define LED0 DT_GPIO_LABEL(LED0_NODE, gpios)
#define PIN DT_GPIO_PIN(LED0_NODE, gpios)
#if DT_PHA_HAS_CELL(LED0_NODE, gpios, flags)
#define FLAGS DT_GPIO_FLAGS(LED0_NODE, gpios)
#endif
#else
/* A build error here means your board isn't set up to blink an LED. */
#error "Unsupported board: led0 devicetree alias is not defined"
#define LED0 ""
#define PIN 0
#endif
#ifndef FLAGS
#define FLAGS 0
#endif
/* HTTP server to connect to */
#define HTTP_HOST "postman-echo.com"
/* Port to connect to, as string */
#define HTTP_PORT "80"
/* HTTP path to request */
#define HTTP_PATH "/get?foo1=bar1&foo2=bar2"
#define SSTRLEN(s) (sizeof(s) - 1)
#define CHECK(r) { if (r == -1) { printf("Error: " #r "\n"); exit(1); } }
#define REQUEST "GET " HTTP_PATH " HTTP/1.0\r\nHost: " HTTP_HOST "\r\n\r\n"
static char response[1024];
int resetcount = 0;
bool connected = false;
void dump_addrinfo(const struct addrinfo *ai)
{
printf("addrinfo @%p: ai_family=%d, ai_socktype=%d, ai_protocol=%d, "
"sa_family=%d, sin_port=%x\n",
ai, ai->ai_family, ai->ai_socktype, ai->ai_protocol,
ai->ai_addr->sa_family,
((struct sockaddr_in *)ai->ai_addr)->sin_port);
}
void print_modem_info(enum modem_info info)
{
int len;
char buf[80];
len = modem_info_string_get(info, buf, 80);
switch (info) {
case MODEM_INFO_RSRP:
printk("Signal Strength: ");
break;
case MODEM_INFO_IP_ADDRESS:
printk("IP Addr: ");
break;
case MODEM_INFO_FW_VERSION:
printk("Modem FW Ver: ");
break;
case MODEM_INFO_ICCID:
printk("SIM ICCID: ");
break;
case MODEM_INFO_IMSI:
printk("IMSI: ");
break;
case MODEM_INFO_IMEI:
printk("IMEI: ");
break;
case MODEM_INFO_DATE_TIME:
printk("Network Date/Time: ");
break;
case MODEM_INFO_APN:
printk("APN: ");
break;
default:
printk("Unsupported: ");
break;
}
if (len > 0) {
printk("%s\n",buf);
} else {
printk("Error %d\n", len);
}
}
void restart_modem() {
int err;
printk("Restarting modem\n");
printk("Deinit\n");
err = lte_lc_deinit();
if (err) {
printk("Failed to deactivate LTE, error: %d\n", err);
}
k_msleep(2000);
printk("Init\n");
err = lte_lc_init();
if (err) {
printk("Failed to activate LTE, error: %d\n", err);
}
printk("Done restarting modem\n");
connected = false;
resetcount++;
}
static void lte_handler(const struct lte_lc_evt *const evt)
{
switch (evt->type)
{
case LTE_LC_EVT_NW_REG_STATUS:
printk("LTE Status: %i", evt->nw_reg_status);
if ((evt->nw_reg_status != LTE_LC_NW_REG_REGISTERED_HOME) &&
(evt->nw_reg_status != LTE_LC_NW_REG_REGISTERED_ROAMING))
{
printk("Moden disconnected!");
connected = false;
break;
}
/* Otherwise send connected event */
printk("Moden connected!");
connected = true;
printk("Network registration status: %s",
evt->nw_reg_status == LTE_LC_NW_REG_REGISTERED_HOME ? "Connected - home network" : "Connected - roaming");
break;
default:
break;
}
}
void main(void)
{
printk("Booting up...\n");
const struct device *dev;
int ret;
int loop = 0;
dev = device_get_binding(LED0);
if (dev == NULL) {
return;
}
ret = gpio_pin_configure(dev, PIN, GPIO_OUTPUT_ACTIVE | FLAGS);
if (ret < 0) {
return;
}
gpio_pin_set(dev, PIN, 0);
static struct addrinfo hints;
struct addrinfo *res;
int st, sock;
int err;
/* Register LTE handler */
lte_lc_register_handler(lte_handler);
/* Enable PSM mode */
err = lte_lc_psm_req(true);
if (err)
printk("Requesting PSM failed, error: %d", err);
err = lte_lc_init();
if (err) {
printk("Failed to init. Err: %i\n", err);
return err;
}
/* Configure modem info module*/
err = modem_info_init();
if (err) {
printk("Failed initializing modem info module, error: %d\n",
err);
return err;
}
while (1) {
loop++;
gpio_pin_set(dev, PIN, 0);
printk("Loop %d... Reset count = %d\n", loop, resetcount);
if(!connected) {
// TODO: move all of this inside the main while loop, so we can "re start" properly
printk("Starting network...\n");
/* Init lte_lc*/
err = lte_lc_connect();
if (err) {
printk("Failed to connect. Err: %i\n", err);
restart_modem();
continue;
}
/* RSRP value */
//err = modem_info_rsrp_register(rsrp_cb);
print_modem_info(MODEM_INFO_FW_VERSION);
print_modem_info(MODEM_INFO_IMEI);
print_modem_info(MODEM_INFO_ICCID);
connected = true;
}
print_modem_info(MODEM_INFO_APN);
print_modem_info(MODEM_INFO_IP_ADDRESS);
print_modem_info(MODEM_INFO_RSRP);
printf("Preparing HTTP GET request for http://" HTTP_HOST
":" HTTP_PORT HTTP_PATH "\n");
hints.ai_family = AF_INET;
hints.ai_socktype = SOCK_STREAM;
st = getaddrinfo(HTTP_HOST, HTTP_PORT, &hints, &res);
printf("getaddrinfo status: %d\n", st);
if (st != 0) {
printf("Unable to resolve address\n");
restart_modem();
continue;
} else {
dump_addrinfo(res);
sock = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
CHECK(sock);
printf("sock = %d\n", sock);
CHECK(connect(sock, res->ai_addr, res->ai_addrlen));
CHECK(send(sock, REQUEST, SSTRLEN(REQUEST), 0));
printf("Response:\n\n");
while (1) {
// TODO: recv this can hang, this a timeout?
int len = recv(sock, response, sizeof(response) - 1, 0);
if (len < 0) {
printf("Error reading response\n");
len = 0;
}
if (len == 0) {
break;
}
response[len] = 0;
printf("%s", response);
}
printf("\n");
(void)close(sock);
}
gpio_pin_set(dev, PIN, 1);
printk("Sleeping\n");
k_msleep(SLEEP_TIME_MS);
}
}
and prj.conf:
# Network
CONFIG_NETWORKING=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y
CONFIG_NET_NATIVE=n
CONFIG_HEAP_MEM_POOL_SIZE=1024
CONFIG_MAIN_STACK_SIZE=2048
# Modem Library
CONFIG_NRF_MODEM_LIB=y
# Modem Information
CONFIG_MODEM_INFO=y
CONFIG_MODEM_KEY_MGMT=y
# LTE Link Control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_LTE_AUTO_INIT_AND_CONNECT=n
# NEWLIB C Library
CONFIG_NEWLIB_LIBC=y
# Date-Time Library
CONFIG_DATE_TIME=y
# Enables use of modem time
CONFIG_DATE_TIME_MODEM=y
# Trigger date-time update automatically when LTE is connected
CONFIG_DATE_TIME_AUTO_UPDATE=y
# Date time update interval, in seconds (Default 14400/4 hours).
# Set to 0 to disable date-time updates.
#CONFIG_DATE_TIME_UPDATE_INTERVAL_SECONDS=3600
CONFIG_GPIO=y
# Enable Zephyr application to be booted by MCUboot
CONFIG_BOOTLOADER_MCUBOOT=y
Any clues on what I’m doing wrong? I have a feeling it might be more to do with the code than the modem, since it doesnt seem to matter what I set the sleep time to (it still fails at loop 8). However, I have no clue how to debug this on the device?
