Issue with "cJSON_Parse failed :" in lte_ble_gateway application

[venkatesh dyagala]

Hi Team,

We are working on the nRF9160 DK. We are integrating the central_uart code into the lte_ble_gateway, As we integrated for the purpose to use NUS(nordic uart service). As the project is compiled successfully, But at run time i observed the below issue in the LTE link monitor

Please find the issue in the highlighted region

Please let me know that do i missed any configs or please point me to the solution why this issue arises

Thanks,

venkatesh

[Turbo J]

Pretty sure there is a missing "}" in the JSON. Please copy and paste AS TEXT and not as image.

[venkatesh dyagala]

Hi,

Please find the text as requested

cJSON_Parse failed: {"desired":{"pairing":{"state":"paired","topics":{"d2c":"prod/05f78b98-f918-44bb-b4ce-f55604c81c6d/m/d/nrf-352656100373185/d2c","c2d":"prod/05f78b98-f918-44bb-b4ce-f55604c81c6d/m/d/nrf-352656100373185/c2d"}},"nrfcloud_mqtt_topic_prefix":"prod/05f78b98-f918-44bb-b4ce-f55604c81c6d/"},"config":{"GPS":{"enable":false}}}\x0D\x0A
2020-07-02T10:08:28.471Z DEBUG modem << E: nrf_cloud_decode_requested_state Failed -2\x0D\x0A
2020-07-02T10:08:28.475Z DEBUG modem << E: Handler failed! state: 5, type: 3\x0D\x0A
2020-07-02T10:08:28.530Z DEBUG modem << E: nct_input: failed -2\x0D\x0A


Thanks,
venkatesh

[Turbo J]

Thanks, I miscounted { } above. Unfortunately that also means I have absolutely zero idea why the JSON parse step failed. :-(

[Simon]

Could you debug your application and look at the function 

• cJSON_Parse() (<..>\ncs\v1.3.0\nrf\subsys\net\lib\nrf_cloud\src\nrf_cloud_codec.c)
  • →cJSON_ParseWithOpts() (<..>\ncs\v1.3.0\nrf\ext\cjson\cJSON.c):

CJSON_PUBLIC(cJSON *) cJSON_ParseWithOpts(const char *value, const char **return_parse_end, cJSON_bool require_null_terminated)
{
    parse_buffer buffer = { 0, 0, 0, 0, { 0, 0, 0 } };
    cJSON *item = NULL;

    /* reset error position */
    global_error.json = NULL;
    global_error.position = 0;

    if (value == NULL)
    {
        goto fail;
    }

    buffer.content = (const unsigned char*)value;
    buffer.length = strlen((const char*)value) + sizeof("");
    buffer.offset = 0;
    buffer.hooks = global_hooks;

    item = cJSON_New_Item(&global_hooks);
    if (item == NULL) /* memory fail */
    {
        goto fail;
    }

    if (!parse_value(item, buffer_skip_whitespace(skip_utf8_bom(&buffer))))
    {
        /* parse failure. ep is set. */
        goto fail;
    }

    /* if we require null-terminated JSON without appended garbage, skip and then check for a null terminator */
    if (require_null_terminated)
    {
        buffer_skip_whitespace(&buffer);
        if ((buffer.offset >= buffer.length) || buffer_at_offset(&buffer)[0] != '\0')
        {
            goto fail;
        }
    }
    if (return_parse_end)
    {
        *return_parse_end = (const char*)buffer_at_offset(&buffer);
    }

    return item;

fail:
    if (item != NULL)
    {
        cJSON_Delete(item);
    }

    if (value != NULL)
    {
        error local_error;
        local_error.json = (const unsigned char*)value;
        local_error.position = 0;

        if (buffer.offset < buffer.length)
        {
            local_error.position = buffer.offset;
        }
        else if (buffer.length > 0)
        {
            local_error.position = buffer.length - 1;
        }

        if (return_parse_end != NULL)
        {
            *return_parse_end = (const char*)local_error.json + local_error.position;
        }

        global_error = local_error;
    }

    return NULL;
}

Put breakpoints on all "goto fail" to see where the error comes from.

Best regards,

Simon