I want to wake up nRF9160 by SMS.
What I want to do:
The nRF9160 usually sleeps to reduce power consumption, and only when it receives SMS it wakes up and send some data by UDP or so.
I succeeded in implementing MQTT(+TLS), but have no experience to implement SMS function.
Any advice?
Hi, Hakon.
I managed to receive SMS during eDRX on at_client and LTE Link Monitor.
AT+CFUN=4 AT%XBANDLOCK=1,"10000000" // Some carriers don't support SMS during eDRX AT+CEDRXS=2,4,"0110" // enable eDRX AT%XPTW=4,"0111" AT+CNMI=3,2,0,1 AT%XSYSTEMMODE=1,0,0,0 AT+CFUN=1 Wait for a while AT+CFUN? // Make sure LTE conection is established AT+CEDRXRDP AT+CNMI? SMS from server wait until unsolicited message shows up on LLM
When I implement this code in usual project and check if SMS notification shows up on LTE Link Monitor, I can't receive SMS notification even though I set "AT+CNMI=3,2,0,1." SMS seems to be received, but SMS notification is not generated.
<main>
.
.
.
void send_at_commands(void)
{
char recv_buf[1024 + 1];
const char *at_commands[] = { "AT+CEDRXRDP", "AT+CNMI?" };
int at_socket_fd = socket(AF_LTE, 0, NPROTO_AT);
if (at_socket_fd < 0) {
printk("Socket err: %d, errno: %d\r\n", at_socket_fd, errno);
}
for (int i = 0; i < ARRAY_SIZE(at_commands); i++) {
printk("%s\n", at_commands[i]);
int bytes_written = send(at_socket_fd, at_commands[i],
strlen(at_commands[i]), 0);
if (bytes_written > 0) {
int r_bytes = blocking_recv(at_socket_fd, recv_buf, sizeof(recv_buf), MSG_DONTWAIT);
if (r_bytes > 0) {
printk("%s", recv_buf);
}
}
}
printk("Closing socket\n\r");
(void)close(at_socket_fd);
}
void main(void)
{
printk("The AT client program started\n");
modem_configure();
send_at_commands();
}
<lte_lc.c>
.
.
#if defined(CONFIG_LTE_LOCK_BANDS)
/* Lock LTE bands 8 (volatile setting) */
static const char lock_bands[] = "AT%XBANDLOCK=2,\"10000000\"";
#endif
/* Request eDRX settings to be used */
static const char edrx_req[] = "AT+CEDRXS=1,"CONFIG_LTE_EDRX_REQ_ACTT_TYPE",\""CONFIG_LTE_EDRX_REQ_VALUE"\"";
static const char edrx_ptw[] = "AT%XPTW=4,\"0111\"";
.
.
static int w_lte_lc_init_and_connect(struct device *unused)
{
/* ADD HERE */
if (at_cmd_write(offline, NULL, 0, NULL) != 0) {
return -EIO;
}
if (at_cmd_write("AT+CNMI=3,2,0,1", NULL, 0, NULL) != 0) {
return -EIO;
}
/* ADD HERE */
#if defined(CONFIG_LTE_EDRX_REQ)
/* Request configured eDRX settings to save power */
if (at_cmd_write(edrx_req, NULL, 0, NULL) != 0) {
return -EIO;
}
if (at_cmd_write(edrx_ptw, NULL, 0, NULL) != 0) {
return -EIO;
}
#endif
if (at_cmd_write(subscribe, NULL, 0, NULL) != 0) {
return -EIO;
}
#if defined(CONFIG_LTE_LOCK_BANDS)
/* Set LTE band lock (volatile setting).
* Has to be done every time before activating the modem.
*/
if (at_cmd_write(lock_bands, NULL, 0, NULL) != 0) {
return -EIO;
}
#endif
#if defined(CONFIG_LTE_LEGACY_PCO_MODE)
if (at_cmd_write(legacy_pco, NULL, 0, NULL) != 0) {
return -EIO;
}
LOG_INF("Using legacy LTE PCO mode...");
#endif
#if defined(CONFIG_LTE_PDP_CMD)
if (at_cmd_write(cgdcont, NULL, 0, NULL) != 0) {
return -EIO;
}
LOG_INF("PDP Context: %s", cgdcont);
#endif
if (at_cmd_write(network_mode, NULL, 0, NULL) != 0) {
return -EIO;
}
k_sem_init(&link, 0, 1);
at_cmd_set_notification_handler(at_handler);
if (at_cmd_write(normal, NULL, 0, NULL) != 0) {
return -EIO;
}
k_sem_take(&link, K_FOREVER);
at_cmd_set_notification_handler(NULL);
return 0;
}
*Without SMS notification, AT+CNMI was reset and probably SMS is received.
/ncs/nrf/drivers/lte_link_control/lte_lc.c
In this lte_lc.c, I think at_cmd_set_notification_handler is related to this issue. Can you check this?
Another question:
Every time SMS is received, SMS notification is reset and you need to run "AT+CNMI=3,2,0,1" again. Why does this happen? Is this possible to set SMS notification permanently?
