Struct SendOptions 

pub struct SendOptions {
    pub mic_size: MicSize,
    pub encrypted: bool,
    pub ack_requested: bool,
    pub full_source: bool,
    pub flood_hops: Option<u8>,
    pub trace_route: bool,
    pub trace_signal: bool,
    pub source_route: Option<Vec<RouterHint, MAX_SOURCE_ROUTE_HOPS>>,
    pub region_code: Option<[u8; 2]>,
    pub salt: bool,
    pub tx_delay_ms: Option<u16>,
}

High-level transmission options passed to Mac send helpers.

SendOptions expresses what the application wants from a send — the coordinator translates these into packet-builder calls and enforces any OperatingPolicy constraints before building the frame.

The default configuration (SendOptions::default()) is a reasonable starting point: 16-byte MIC, encryption enabled, no ACK, 3-byte source hint, 5 flood hops, no trace route, no salt.

SendOptions exposes a fluent builder API so applications can override only what they care about:

let opts = SendOptions::default()
    .with_ack_requested(true)
    .with_mic_size(MicSize::Mic8)
    .no_flood()
    .with_trace_route();

Field notes

• mic_size — trading MIC length against frame overhead. 16-byte MIC is strongly preferred for unicast; 4-byte may be acceptable for low-bandwidth broadcast beacons.
• flood_hops — None disables flood forwarding (point-to-point or source-routed only). Some(n) caps the initial FHOPS_REM budget; repeaters decrement it and drop at zero. For unicast and blind unicast this is a ceiling rather than a fixed value: a route already learned for the peer narrows the budget to what that route costs plus ESTABLISHED_ROUTE_EXTRA_HOPS, so an established path does not re-flood the whole mesh. Clear the peer’s cached route (MacHandle::clear_peer_route) to get the full budget back.
• full_source — include the full 32-byte public key instead of the 3-byte hint, allowing the receiver to authenticate without a prior key exchange. Useful for first contact or identity announcements; costs 29 extra bytes per frame.
• salt — append a random 2-byte salt to SECINFO, adding nonce diversity and preventing correlation of frames sharing the same counter value across sessions.
• source_route — provide an explicit list of [RouterHint] values to route the frame along a known path rather than relying on flood forwarding. Routed hops cost no flood budget, so an attached source route narrows flood_hops to the slack that backstops the route’s far end rather than to the route’s length.

Fields

mic_size: MicSize

Requested MIC size.

encrypted: bool

Whether the payload should be encrypted when supported.

ack_requested: bool

Whether a transport ACK should be requested.

full_source: bool

Whether to encode the full source public key.

flood_hops: Option<u8>

Optional flood-hop budget.

trace_route: bool

Whether to include a trace-route option.

trace_signal: bool

Whether to include a trace-signal option.

source_route: Option<Vec<RouterHint, MAX_SOURCE_ROUTE_HOPS>>

Optional explicit source route.

region_code: Option<[u8; 2]>

Optional region-code option.

salt: bool

Whether to include a random salt in SECINFO.

tx_delay_ms: Option<u16>

Optional delay before the first transmit attempt, in milliseconds.

The frame is sealed and queued immediately but held until the delay elapses. Used to desynchronize sends that many nodes may make at once — replies to a broadcast Identity Request, say — so they do not all hit the channel together. ACK deadlines start at the first actual transmit, not at queue time.

Implementations

impl SendOptions

pub fn with_mic_size(self, mic_size: MicSize) -> Self

Override the MIC size.

pub fn with_ack_requested(self, value: bool) -> Self

Set whether the send should request an ACK.

pub fn with_flood_hops(self, hops: u8) -> Self

Set the flood-hop budget.

pub fn no_flood(self) -> Self

Disable flood forwarding.

pub fn with_trace_route(self) -> Self

Request that a trace-route option be added.

pub fn with_trace_signal(self) -> Self

Request that a trace-signal option be added. Each repeater prepends the signal quality it received the frame at, one entry per trace-route hint, so this is only useful together with with_trace_route.

pub fn try_with_source_route( self, route: &[RouterHint], ) -> Result<Self, CapacityError>

Copy a source route into fixed-capacity storage.

pub fn with_salt(self) -> Self

Request a random salt in SECINFO.

pub fn with_full_source(self) -> Self

Force the source address to use the full public key.

pub fn unencrypted(self) -> Self

Disable encryption for this send.

pub fn with_region_code(self, code: [u8; 2]) -> Self

Set the region-code option.

pub fn with_tx_delay_ms(self, delay_ms: u16) -> Self

Hold the frame for delay_ms before its first transmit attempt.

Trait Implementations

impl Clone for SendOptions

fn clone(&self) -> SendOptions

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for SendOptions

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

Formats the value using the given formatter.

impl Default for SendOptions

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for SendOptions

fn eq(&self, other: &SendOptions) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for SendOptions

impl StructuralPartialEq for SendOptions