This service allow to save a register in time of a defined characteristic of other service. It can save any numeric value from any characteristic of any service, even from hidden services.

HAA Home Manager App is needed to read data history. Other third-party HomeKit clients will not work. It will save all data in your device only opening it. There is not needed to enter into each data history service.

A NTP server is required in order to this service works.

This service can be declared as a main service of an accessory, however, it is recommended to setup it into extra services array, but it must be declared in MEPLHAA script after target service.

The following configuration is available:

{
  "a": [{
    "t": 1,
    "es": [{
      "t": 95,
      "h": [ 1, 0, 5 ]
    }]
  }]
}

In this example, there is an accessory with a switch as a main service, and a historical data as an extra service. That service will store switch (service number 1) value (characteristic 0) each time it is triggered, saving last 500 changes (5 blocks).

This array is used to define configuration of service.

• Service: Index number of the service that has the characteristic to register. It is the same used by Service Notification action.
• Characteristic: Index number of characteristic to register. See each service to know them.
• Blocks: Number of blocks used to store data in DRAM. Each block can store 100 registers, and used about 1KB of DRAM.

Characteristics marked with * will not be saved with each change. However, they must be read using Polling Time or Service Notifications.

When all blocks are full, oldest values will be overwritten with news.

Polling time is defined by the "j" key contained within the service object.

Characteristic value will be saved each defined polling time seconds.

Take a read when HAA clock is ready with NTP server.

The list of Service Notifications "m" values supported are:

See the general Service Notifications section for details of how to configure these notifications.

The Initial Lock State about Service and Physical controls.