cJSON_print() issue

[Shekhar Suthar]

I'm using nRF9160DK and in that cJSON formation give me some error because of that my device will restart again and again

as in code if I'm input cJSON_AddNumberToObject(Data,"Humidity",22); that time its happening but I thing the problem with cJSON_print()

cJSON_AddItemToObject(Device_data1, "data", Data = cJSON_CreateObject());
cJSON_AddStringToObject(Data,"Temperature","67");
cJSON_AddStringToObject(Data,"Humidity","44");
//cJSON_AddNumberToObject(Data,"Humidity",22);

Attribute_json_Data = cJSON_Print(Attribute_json);

????

[Martin Lesund]

Hi Sekhar,
Please share the error output and more of your code.

Could you try to use this as a reference? https://github.com/civetweb/civetweb/blob/master/examples/rest/rest.c#L60

[Shekhar Suthar]

I want publish my JSON data by MQTT to cloud

Martin Lesund said:

Could you try to use this as a reference?

I tried that way too but when I return cJSON that send blank value in string

[Shekhar Suthar]

Martin Lesund said:

Please share the error output and more of your code.

void main(void)
{
	
	if (!IS_ENABLED(CONFIG_AT_HOST_LIBRARY)) {
		/* Stop the UART RX for power consumption reasons */
		NRF_UARTE0_NS->TASKS_STOPRX = 1;
		NRF_UARTE1_NS->TASKS_STOPRX = 1;
	}


      cJSON *Attribute_json = NULL;
      cJSON *Device_data1 = NULL;
      cJSON *Device_data2 = NULL;
      cJSON *Data = NULL;
      cJSON *Sensor = NULL;
      char *out = NULL;

    Attribute_json = cJSON_CreateArray();
    cJSON_AddItemToArray(Attribute_json, Device_data1 = cJSON_CreateObject());
    cJSON_AddStringToObject(Device_data1, "uniqueId","uniqueId");
    cJSON_AddStringToObject(Device_data1, "time","2020-04-01T06:23:23.000Z");
    cJSON_AddItemToObject(Device_data1, "data", Data = cJSON_CreateObject());
    cJSON_AddNumberToObject(Device_data1,"Humidity", 45);
    //cJSON_AddStringToObject(Device_data1,"Humidity", "45");

    cJSON_AddNumberToObject(Data,"Temperature",23);

   
    out = cJSON_PrintUnformatted(Attribute_json);
    //out = cJSON_Print(Attribute_json);

    while(1){
       printk("\n >> %s \n",out);
       // printk("\n >> %s \n",cJSON_PrintBuffered(Attribute_json, 2000,0));
       k_sleep(5000);
       }

}

I shared main function try to in that I just want to print that Json I tried two three way you can see in comments parts

tried with making different function and pass there may be that will work but result is same

cJSON_AddNumberToObject(Device_data1,"Humidity", 45);

if I use that way to add a Number in JSON that will restart again and again my device

but if I used String on that case its working fine as below comment code    

//    cJSON_AddStringToObject(Device_data1,"Humidity", "45");

even if add a single json number in object that isn't working fine   ????

[Martin Lesund]

Have you tried setting up a debug session to see where in the code it triggers the reset?

[Shekhar Suthar]

Yes I did and I got point out like that