HTTP POST with NCS v1.0.0-rc4

[Hoang]

Dear Bjørn Kvaale, 

I just tried to run LTE-M/HTTP POST with NCS v1.0.0-rc4 (with nrf git fetch origin pull/943/head:branch1)

but, I COULD NOT POST any more:

**** Booting Zephyr OS build v1.14.99-ncs2-rc4-495-ga8933a2ead01 *****
LTETESTING is starting 
 LTE is connecting........... 
Checking LTE_M signal.............

+COPS: 0,2,"24201",7

OK

OK

+CEREG: 2,1,"765D","0110C303",7

OK


Original String is: +CEREG: 2,1,"765D","0110C303",7

OK

Found the LTE_M signal 
Closing socket

  find LTE_M signal........... 
***** USAGE FAULT *****
  Illegal load of EXC_RETURN into PC
***** Hardware exception *****
Current thread ID = 0x200203a8
Faulting instruction address = 0x0
Fatal fault in thread 0x200203a8! Aborting.
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 = 0x20021ae4
Faulting instruction address = 0x21992
Fatal fault in ISR! Spinning...

It worked normal with the old version v0.4.0

1. when i used the same setup, i got error: 

1> zephyr/subsys/net/ip/libsubsys__net__ip.a(net_if.c.obj): In function `net_if_ipv6_calc_reachable_time':
1> D:/hng/projects/CyCollector/ncs_v1.0.0_rc4/zephyr/subsys/net/ip/net_if.c:2067: undefined reference to `sys_rand32_get'
1> collect2.exe: error: ld returned 1 exit status

2. I added the option: 

# Disable native network stack to save some memory
CONFIG_NET_IPV4=n
CONFIG_NET_IPV6=n

then, Build Solution: Build completed

but, I got the error 

My code:

LTE_M_NB-IoT.7z

Thanks so much

Regards, 

hng

[Simon]

I was able to post to a webserver, with ncs v1.0.0 and modem v1.0.0. Could you test my attached example?

http_post.zip

Best regards,

Simon

[Hoang]

Hi @Simon

Thanks so much, I just backed from vocation, I will try your suggestion and contact with you soon

Mvh, 

Hoang Nguyen 

[Hoang]

Dear Simon

I tried with your suggestion: ncs v1.0.0

and your example: ( change to my webserver address)

 char send_buf[] = "POST /? HTTP/1.1\r\n"\
		"Host: 142.93.37.192\r\n"\
		"Connection: keep-alive\r\n"\
	    "Content-type: application/x-www-form-urlencoded\r\n"\
		"Content-length: 50\r\n\r\n"\
		"hng12 34 566 678899 01233 345678 99876543 2765432654";

and it works, 

your code, you did NOT use function snprintf() 

char send_buf[MAXLINE + 1];
	      
int send_data_len_post = snprintf(send_buf,
				         500, 
				         POST_TEMPLATE, HTTP_PATH,
				         HTTP_HOST, strlen(PostString),
				         PostString);

snprintf() does NOT work !! 

I want to use snprintf() because I want to assign my "PostString" to send_buf() 

I am confusing: why snprintf() does NOT work? if i use your suggestion, how can i assign my data to send_buf()

Thanks so much, 

Yeah, 1 more thing, about NCS v1.0.0-rc4, I will tell you why I used this version: We ( my company) got the support from Nordicsemi and Bjørn Kvaale came to help us. and we tried ncs v1.0.0, asset_tracker DIDNT work, it didnt show the real data of GPS, so Bjørn suggested use ncs v.1.0.0-rc4, then asset_tracker WORKs. 

Thanks again 

Hoang  Nguyen

[Hoang]

Hi Simon, 

I tried with a simple example to test snprintf() function. 1 with LTE and without LTE

1. Without LTE: 

# LTE link control
#CONFIG_LTE_LINK_CONTROL=y

#include <zephyr.h>
#include <net/socket.h>
#include <stdio.h>
#include <uart.h>
#include <string.h>

#define MAXLINE 4096
#define HTTP_HOST "142.93.37.192"
#define HTTP_PATH "/"
#define TEST_STRING  "Hello from nRF9160 DK"

#define POST_TEMPLATE "POST %s? HTTP/1.1\r\n"\
		"Host: %s\r\n"\
		"Connection: keep-alive\r\n"\
	        "Content-type: application/x-www-form-urlencoded\r\n"\
		"Content-length: %d\r\n\r\n"\
		"%s"
int main(void)
{

     char tmp_str[MAXLINE + 1];
     snprintf(tmp_str,500,
		"$GPGGA,%02d%02d%02d.200,%8.3f,N,%09.3f,W,1," 
		"12,1.0,0.0,M,0.0,M,,*", 2019, 07, 23, 59.3033, 10.454);
     printf("tmp_string is: %s \n",tmp_str); 
     

     char send_buf[MAXLINE + 1];
     int send_data_len_post = snprintf(send_buf,
				         500, 
				         POST_TEMPLATE, HTTP_PATH,
				         HTTP_HOST, strlen(TEST_STRING),
				         TEST_STRING);

     printf("send_buf is: %s \n",send_buf);
     printk("send err: %d\n\r", send_data_len_post);
     while (1) {
          //5 seconds delay
          k_sleep(5000);
          
          }
	
}

it works, 

***** Booting Zephyr OS v1.14.99-ncs2 *****
tmp_string is: $GPGGA,20190723.200,  59.303,N,00010.454,W,1,12,1.0,0.0,M,0.0,M,,* 
send_buf is: POST /? HTTP/1.1

Host: 142.93.37.192

Connection: keep-alive

Content-type: application/x-www-form-urlencoded

Content-length: 21



Hello from nRF9160 DK 
send err: 155

and Now, without LTE:

# LTE link control
CONFIG_LTE_LINK_CONTROL=y

and error:

***** Booting Zephyr OS v1.14.99-ncs2 *****
tmp_string is: $GPGGA,201907***** HARD FAULT *****
  Fault escalation (see below)
***** BUS FAULT *****
  Precise data bus error
  BFAR Address: 0x61000064
***** Hardware exception *****
Current thread ID = 0x61000000
Faulting instruction address = 0xd998
Fatal fault in ISR! Spinning...

snprintf() and LTE_LINK_CONTROL conflict !?

Thanks, 

Mvh

Hoang Nguyen

[Simon]

Try using snprintk() instead, that worked for me.

Best regards,

Simon

[Hoang]

Hi Simon, 

I tried to use snprintk(), but it did NOT work, the same error came with me

***** Booting Zephyr OS v1.14.99-ncs2 *****
tmp_string is: $GPGGA,2019072***** HARD FAULT *****
  Fault escalation (see below)
***** BUS FAULT *****
  Precise data bus error
  BFAR Address: 0x61000064
***** Hardware exception *****
Current thread ID = 0x61000000
Faulting instruction address = 0xd998
Fatal fault in ISR! Spinning...

can you send me the full setup. thanks

Mvh

Hoang Nguyen

[Simon]

I am sorry, I was too quick to answer and gave you wrong information. The change that made it work was to set CONFIG_NO_OPTIMIZATION=y in prj.conf. I am attaching main.c and prj.conf down below.

prj.conf

CONFIG_BSD_LIBRARY=y
CONFIG_TEST_RANDOM_GENERATOR=y
CONFIG_NETWORKING=y
CONFIG_NET_BUF_USER_DATA_SIZE=1
CONFIG_NET_SOCKETS_OFFLOAD=y
CONFIG_NET_SOCKETS=y
CONFIG_NET_SOCKETS_POSIX_NAMES=y
CONFIG_NET_RAW_MODE=y
CONFIG_HEAP_MEM_POOL_SIZE=1024
# LTE link control
CONFIG_LTE_LINK_CONTROL=y
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_NO_OPTIMIZATIONS=y

main.c

#include <zephyr.h>
#include <net/socket.h>
#include <stdio.h>
#include <uart.h>
#include <string.h>

#define MAXLINE 4096
#define HTTP_HOST "142.93.37.192"
#define HTTP_PATH "/"
#define TEST_STRING  "Hello from nRF9160 DK"

#define POST_TEMPLATE "POST %s? HTTP/1.1\r\n"\
		"Host: %s\r\n"\
		"Connection: keep-alive\r\n"\
	        "Content-type: application/x-www-form-urlencoded\r\n"\
		"Content-length: %d\r\n\r\n"\
		"%s"
int main(void)
{
     printk("Hello from start of main");
     char tmp_str[MAXLINE + 1];
     snprintf(tmp_str,500,
		"$GPGGA,%02d%02d%02d.200,%8.3f,N,%09.3f,W,1," 
		"12,1.0,0.0,M,0.0,M,,*", 2019, 07, 23, 59.3033, 10.454);
     //printf("tmp_string is: %s \n",tmp_str); 
     

     char send_buf[MAXLINE + 1];
     int send_data_len_post = snprintk(send_buf,
                                         500,
				         POST_TEMPLATE, HTTP_PATH,
				         HTTP_HOST, strlen(TEST_STRING),
				         TEST_STRING);

     printf("send_buf is: %s \n",send_buf);
     printk("send err: %d\n\r", send_data_len_post);
     while (1) {
          //5 seconds delay
          k_sleep(5000);
          
          }
	
}

Best regards,

Simon