How do I batch multiple Time Series Data points into a single MQTT message?

Build the JSON payload manually and publish it directly via MQTT. This avoids the overhead of multiple esp_rmaker_param_update_and_report calls.

Payload format (example: device EnergyTsData, parameters A, B, C, D, 3 records each at 60-second intervals):

{
  "ts_data_version": "2021-09-13",
  "ts_data": [
    {
      "name": "EnergyTsData.A",
      "dt": "float",
      "records": [
        {"t": 1678782905, "v": 768.0},
        {"t": 1678782965, "v": 768.0},
        {"t": 1678783025, "v": 768.0}
      ]
    }
  ]
}

• name: <DeviceName>.<ParameterName>
• dt: data type ("float", "int", "string", etc.)
• t: Unix timestamp when the data was generated
• v: data value

Publish to cloud:

esp_err_t esp_rainmaker_report_ts_data(char *buf, size_t buf_size)
{
    char publish_topic[150] = {0};
    esp_rmaker_create_mqtt_topic(publish_topic, sizeof(publish_topic),
        "tsdata", "esp_ts_ingest");
    return esp_rmaker_mqtt_publish(publish_topic, buf, buf_size, RMAKER_MQTT_QOS1, NULL);
}

When using this method, the parameter does not need PROP_FLAG_TIME_SERIES — the application controls all reporting.