Decode an Array of Array

RE: Decode an Array of Array

maadaf — Thu, 20 Apr 2023 13:11:04 GMT

Thank you Marte. I will try it as soon as possible.

Best regards

Maadaf

RE: Decode an Array of Array

Marte Myrvold — Thu, 20 Apr 2023 12:45:57 GMT

Hi,

I recommend using the cJSON library, which is a simple JSON parses, instead of doing everything yourself.

This library is used in multiple of our nRF9160 samples, for example, AWS IoT, so you can look there for an example of how to use it.

Make sure to also enable the library in prj.conf:

CONFIG_CJSON_LIB=y

Best regards,

Marte

RE: Decode an Array of Array

maadaf — Thu, 20 Apr 2023 09:23:39 GMT

I'm Sorry my mistake. That's not the last one I've been trying. The last attempt was:

{
	"schedules":[{
		"valve":"v1",
		"schedule_res":[{
			"starthour":"0600",
			"activetime":30,
			"days":"1111111"
		},{
			"starthour":"1900",
			"activetime":20,
			"days":"1110111"
		}],[{
			"valve":"v2",
			"schedule_res":[{
				"starthour":"0800",
				"activetime":10,
				"days":"1111100"
			},{
				"starthour":"2300",
				"activetime":50,
				"days":"1110110"
			}]
		}]
	}]
}

struct schedule {
	const char *starthour;
	int activetime;
	const char *days;
};

struct schedule_v {
	const char *valve;
	struct schedule schedule_res[2];
	size_t num_elements;
};

struct schedule_ctl {
	struct schedule_v schedules[2];
	size_t num_elements1;
};

static const struct json_obj_descr schedule_descr[] = {
	JSON_OBJ_DESCR_PRIM(struct schedule, starthour, JSON_TOK_STRING),
	JSON_OBJ_DESCR_PRIM(struct schedule, activetime, JSON_TOK_NUMBER),
	JSON_OBJ_DESCR_PRIM(struct schedule, days, JSON_TOK_STRING),
};

static const struct json_obj_descr schedule_ctl_descr[] = {
	JSON_OBJ_DESCR_PRIM(struct schedule_v, valve, JSON_TOK_STRING),
	JSON_OBJ_DESCR_OBJ_ARRAY(struct schedule_v, schedule_res, 10, num_elements, schedule_descr, ARRAY_SIZE(schedule_descr)),
};

static const struct json_obj_descr schedule_ctl_[] = {
	JSON_OBJ_DESCR_OBJ_ARRAY(struct schedule_ctl, schedules, 10, num_elements1, schedule_ctl_descr, ARRAY_SIZE(schedule_ctl_descr)),
};

I've tryied so many variations already. My problem are with the zephyr struct definitions.

Thanks

RE: Decode an Array of Array

Turbo J — Thu, 20 Apr 2023 09:18:08 GMT

Neither const char nor const is applicable for a string constant.

You might wanted to use "const char * " in both cases. That star is important as it will need to be a pointer to a character array.