GPS/LTE_M/NB-IoT nRF91

[Hoang]

Dear, 

I am using :

ncs: v0.4.0 

SES 4.16 

firmware: mfwnrf916007029alpha

Hardware: nRF9160 DK v: 0.8.5

I want to do: 

1. Enable and get GPS position ("AT\%XSYSTEMMODE=0,0,1,0") and data from BMP280 sensor  --> store it in data_pack

2. Turnoff GPS and Enable LTE_M: ("AT\%XSYSTEMMODE=1,0,0,0") & use HTTP POST to post data_pack to my webserver 

3. Switch to NB-IoT: ("AT\%XSYSTEMMODE=0,1,0,0") & use HTTP POST to post data_pack to my webserver

Is it posiblie to do like that now?

I know: "The current modem firmware, v0.7.0-29-alpha, allows you to choose the system mode via command %XSYSTEMMODE, but it does not support them concurrently, meaning that you cannot have GPS + NB-IoT, or GPS + CAT M1, enabled simultaneously at this time." Håkon Alseth https://devzone.nordicsemi.com/f/nordic-q-a/48077/gps-http-post

I can switch: AT\%XSYSTEMMODE=0,0,1,0/AT\%XSYSTEMMODE=1,0,0,0/AT\%XSYSTEMMODE=0,1,0,0 but I couldn't POST data to my webserver.

Do you have any suggestions?

Thanks,

Regards, 

hng

[Håkon Alseth]

Hi hng,

 

I am very sorry for not seeing the last post in the linked case.

The system has a flaw when you accept an answer, then add a new reply, it will still mark the case as resolved, so I do not get a notification or state-change on that topic, unfortunately.

 

From the last reply, it seems that you are not able to successfully connect over NB-IoT in your area, as you do not get the Cell ID, MCC, MNC, and other registration information. You could try to ask your local network providers if there's a nb-iot coverage issue in your area.

Cat M1 still works fine, right?

 

Kind regards,

Håkon

[Hoang]

Dear Håkon Alseth

Thats ok Håkon. 

I verified the NB-IoT in Horten, Vestfold with iBasis: NO. Then, I used another sim card (telia), I got NB-IoT signal but no LTE-M. I will find someone else, can supply both LTE-M and NB-IoT. 

But, what do you think about my plan: 

I want to do: 

1. Enable and get GPS position ("AT\%XSYSTEMMODE=0,0,1,0") and data from BMP280 sensor  --> store it in data_pack

2. Turnoff GPS and Enable LTE_M: ("AT\%XSYSTEMMODE=1,0,0,0") & use HTTP POST to post data_pack to my webserver 

3. Switch to NB-IoT: ("AT\%XSYSTEMMODE=0,1,0,0") & use HTTP POST to post data_pack to my webserver

Is it possible to do like that now?

Regards,

hng

[Håkon Alseth]

Hi,

 

Your code prints "client_fd: -1", which indicates that the socket is not allocated. Looking through the code, it seems that you do not close your sockets after you're done, for instance in nRF_offGPS_onLTE. For every created socket(), there should be a corresponding close(). This also goes for the getaddrinfo(), which should also have a corresponding freeaddrinfo() within the same scope.

 

Kind regards,

Håkon

[Hoang]

Dear Håkon Alseth, 

Thanks so much

I could  :

(1) GPS position

(2) LTE-M connection 

(3) http post with LTE-M to my webserver

I tried to release the LTE-M socket() after posting and run loop (1)-(2)-(3) again. But, I couldn't connect to gps socket again.

void app_http_post(char *PostString)
{  
	//int err; 
        printk("Sending data to webserver\n");
        struct sockaddr_in local_addr;
	struct addrinfo *res;

	local_addr.sin_family = AF_INET;
	local_addr.sin_port = htons(0);
	local_addr.sin_addr.s_addr = 0;

	    
	int err = getaddrinfo(HTTP_HOST, NULL, NULL, &res);

	printk("getaddrinfo err: %d\n\r", err);
	((struct sockaddr_in *)res->ai_addr)->sin_port = htons(HTTP_PORT);
        
        char send_buf[MAXLINE + 1];
	int send_data_len_post = snprintf(send_buf,
				         500, /*total length should not exceed MTU size*/
				         POST_TEMPLATE, HTTP_PATH,
				         HTTP_HOST, strlen(PostString),
				         PostString);

	printk("send err: %d\n\r", send_data_len_post);
	int client_fd = socket(AF_INET, SOCK_STREAM, 0);
	printk("client_fd: %d\n\r", client_fd);
	err = bind(client_fd, (struct sockaddr *)&local_addr, sizeof(local_addr));
	printk("bind err: %d\n\r", err);
       	err = blocking_connect(client_fd, (struct sockaddr *)res->ai_addr,sizeof(struct sockaddr_in));
	printk("connect err: %d\n\r", err);
        int numbytes = blocking_send(client_fd, send_buf, send_data_len_post, 0);
        printk("send err: %d\n\r", numbytes);

        freeaddrinfo(res); // free getaddrinfo(HTTP_HOST, NULL, NULL, &res);
        k_sleep(1000);
        printk("Close socket \n\r");
       	close(client_fd); // close the socket
       
   
}

and : lte_lc_offline(); 

but, I couldnt connect to GPS socket 

fd = nrf_socket(NRF_AF_LOCAL, NRF_SOCK_DGRAM, NRF_PROTO_GNSS);

the source code: 

GPS_LTE_June25.7z

The second time, it will return: 

Could not init socket (err: -1)

Thanks, 

Regards, 

[Håkon Alseth]

Hi hng,

 

We have an issue when switching back and forth several times in the current modem fw v0.7.0-29. We have reported this internally to our designers and developers, and they are working on fixing this issue.

 

Kind regards,

Håkon

[Hoang]

Dear Håkon Alseth, 

Thanks so much, 

I hope you can fix it in the next fw version. 

Regards

hng

[Håkon Alseth]

It is our intention to fix this soon.

Sorry for the inconvenience.

 

Kind regards,

Håkon

[Hoang]

Hi Håkon Alseth, 

With the new ncs version 1.0.0, and FW1.0.0 and HW nRF91 DK 0.8.5, can we run the loop ( GPS_TLE_HTTP Post) now? Håkon Alseth. 

With asset_tracker/gps_controller, how did you control gps and lte? 

I am trying with a new ticket, but it takes so long time for me to find out the solution. 

https://devzone.nordicsemi.com/f/nordic-q-a/50566/gps-and-http-post-ncs_v1-0-0 

I hope you can help. thanks so much 

Regards, 

Hng

[fabocode]

Hi 

I'm trying to get the same solution (read GPS data and send it to my webserver) but I don't know if you finally found a way to do it. I'm using a Thingy:91 for this 

[Hoang]

hi fabocode

Ja, I could do it now.

But, this ticket was created with old FW, when PSM was not enabled yet. 

With the new FW, we can use PSM mode - LTE-M/NB_iot & GPS could work together  

  

#if defined(CONFIG_LTE_NETWORK_MODE_NBIOT)
/* Set network mode to Narrowband-IoT */
static const char network_mode[] = "AT%XSYSTEMMODE=0,1,1,0";
#elif defined(CONFIG_LTE_NETWORK_MODE_LTE_M)
/* Set network mode to LTE-M */
static const char network_mode[] = "AT%XSYSTEMMODE=1,0,1,0";
#endif

I used PSM mode, and asset_tracker example - removed the nrfcloud/mqtt ... 

1. enable PSM mode 

2. search the satellite to find the position

3. send the position to my webserver by http post  - you can check https://devzone.nordicsemi.com/f/nordic-q-a/46086/nrf9160-dk-http-post-to-my-webserver/182163#182163

hope it can help. 

Sorry, I couldn't share my code for you. 

BR, 

Hoang Nguyen