Struct SyncState 

pub struct SyncState {
    pub device_id: String,
    pub last_history_index: Option<u16>,
    pub total_readings: Option<u16>,
    pub last_sync_at: Option<OffsetDateTime>,
}

Tracks incremental sync progress for a device’s history.

Aranet devices use a ring buffer for history storage, with a 1-based index. SyncState tracks the last downloaded index so subsequent syncs can download only new records instead of re-downloading everything.

Incremental Sync Algorithm

1. Read device’s current total_readings count
2. Call Store::calculate_sync_start to get start index
3. Download records from start_index to total_readings
4. Call Store::update_sync_state to save progress

Example

use aranet_store::Store;

let store = Store::open_in_memory()?;
store.upsert_device("Aranet4 17C3C", None)?;

// First sync downloads all 500 records
let start = store.calculate_sync_start("Aranet4 17C3C", 500)?;
assert_eq!(start, 1); // Start from beginning

// After syncing, save state
store.update_sync_state("Aranet4 17C3C", 500, 500)?;

// Next sync: device now has 510 records
let start = store.calculate_sync_start("Aranet4 17C3C", 510)?;
assert_eq!(start, 501); // Only download new records

Fields

device_id: String

Device identifier.

last_history_index: Option<u16>

Last downloaded history index (1-based).

total_readings: Option<u16>

Total readings on device at last sync.

last_sync_at: Option<OffsetDateTime>

When the last sync completed.

Trait Implementations

impl Clone for SyncState

fn clone(&self) -> SyncState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for SyncState

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for SyncState

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for SyncState

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.