Dear,
I am using THINGY91 for proving my concept, I put THINGY91 in the freezer - to adapt to the temperature.
I am using NB_iot of telia (norway)
My problem is: sometimes my thingy91 lost the network (the freezer is so good :( ), and couldn't send the data to my webserver
I tried to change my state-machine: THINGY91 will check the network and reconnect if it couldn't find the network
1. check the network:
/****************************************************************************************************
*name: NETWORK CHECK
*todo: find status of the network
*return: connect/disconnect: *mccmnc
*
****************************************************************************************************/
void NETW_CHECK(char *mccmnc )
{
const char *ATCOPS="AT+COPS?";
int at_socket_fd = socket(AF_LTE, 0, NPROTO_AT);
// printk("LTE socket is: %d \n",at_socket_fd);
if (at_socket_fd < 0) {
printk("Socket err: %d, errno: %d\r\n", at_socket_fd, errno);
}
/*
* find MNC and MCC
*/
int bytes_written0 = send(at_socket_fd, ATCOPS, strlen(ATCOPS), 0);
if (bytes_written0 > 0) {
int r_bytes =
blocking_recv(at_socket_fd, recv_buf,
sizeof(recv_buf), MSG_DONTWAIT);
if (r_bytes > 0) {
//printk("%s", recv_buf);
char splitStringsmcc[10][10];
split_string_ltepos(recv_buf,splitStringsmcc);
memcpy(mccmnc,splitStringsmcc[1],sizeof(splitStringsmcc[1]));
printk("MCC&MNC: %s\n\r",mccmnc);
}
}
(void)close(at_socket_fd);
}
I will return MCCMNC,"24202" for telia, and if it couldnt find the network, I will try to reconnect:
void reconnect_nw(void){
int err;
printk("ReConnecting to LTE network. ");
printk("This may take several minutes.\n");
//ui_led_set_pattern(UI_LTE_CONNECTING);
err = lte_lc_init_and_connect();
if (err) {
printk("LTE link could not be established.\n");
}
printk("Connected to LTE network\n");
}
But, this function lte_lc_init_and_connect() didnt work, it just returned "LTE link could not be established.;
I am using the config file as the same with : master/applications/asset_tracker/prj_nrf9160_pca20035ns.conf, it will contain "CONFIG_LTE_AUTO_INIT_AND_CONNECT=n"
Could you plz help me, I need a solution how can thingy91 can automatically re-connect the network if the network is disconnected.
Thanks so much
Best Regards,
Hoang Nguyen
