Neuron MQTT 插件将采集到的数据以 JSON 形式发布到指定的主题。 上报数据的具体格式由上报数据格式 参数指定,有 tags-format 和 values-format 两种格式。
结合ekuiper使用,或者直接用neuronex,然后数据处理中加规则修改格式;或者直接修改代码实现自己要的格式
我把源代码下下来了,
这个函数里边这段代码,跳进去看没看懂
特别是这个函数
int neu_json_encode_read_resp1(void *json_object, void *param)
{
int ret = 0;
neu_json_read_resp_t *resp = (neu_json_read_resp_t *) param;
void *values = neu_json_encode_new();
void *errors = neu_json_encode_new();
void *metas = neu_json_encode_new();
neu_json_read_resp_tag_t *p_tag = resp->tags;
for (int i = 0; i < resp->n_tag; i++) {
neu_json_elem_t tag_elem = { 0 };
if (p_tag->error == 0) {
tag_elem.name = p_tag->name;
tag_elem.t = p_tag->t;
tag_elem.v = p_tag->value;
tag_elem.precision = p_tag->precision;
neu_json_encode_field(values, &tag_elem, 1);
} else {
tag_elem.name = p_tag->name;
tag_elem.t = NEU_JSON_INT;
tag_elem.v.val_int = p_tag->error;
neu_json_encode_field(errors, &tag_elem, 1);
}
if (p_tag->n_meta > 0) {
void *meta = neu_json_encode_new();
for (int k = 0; k < p_tag->n_meta; k++) {
neu_json_elem_t meta_elem = { 0 };
meta_elem.name = p_tag->metas[k].name;
meta_elem.t = p_tag->metas[k].t;
meta_elem.v = p_tag->metas[k].value;
neu_json_encode_field(meta, &meta_elem, 1);
}
neu_json_elem_t meta_elem = { 0 };
meta_elem.name = p_tag->name;
meta_elem.t = NEU_JSON_OBJECT;
meta_elem.v.val_object = meta;
neu_json_encode_field(metas, &meta_elem, 1);
}
p_tag++;
}
neu_json_elem_t resp_elems[] = {
{
.name = "values",
.t = NEU_JSON_OBJECT,
.v.val_object = values,
},
{
.name = "errors",
.t = NEU_JSON_OBJECT,
.v.val_object = errors,
},
{
.name = "metas",
.t = NEU_JSON_OBJECT,
.v.val_object = metas,
},
};
ret = neu_json_encode_field(json_object, resp_elems,
NEU_JSON_ELEM_SIZE(resp_elems));
return ret;
}
有没有官方的教程
没有相关的教程,改功能肯定是要了解代码的,多看看就能看懂。
好的,继续研究中
请问使用数据处理中加规则修改格式有具体案例吗?我不知道怎么修改