Function pamoja_gateway_network_answer 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn pamoja_gateway_network_answer(
    network: *mut PamojaGatewayNetwork,
    dev_addr: u32,
    slot: PamojaGatewayNetworkSlot,
    fport: u8,
    payload: *const u8,
    payload_len: usize,
    buffer: *mut u8,
    capacity: usize,
    out_txpk: *mut PamojaGatewayTxpk,
    out_len: *mut usize,
) -> PamojaStatus

Builds a downlink for a device, encrypted with its session.

Arguments

• network - the network.
• dev_addr - the device to answer.
• slot - where and when to transmit, from the event that reported the uplink.
• fport - the port to answer on.
• payload - what to send.
• payload_len - its length.
• buffer - where to write the frame to transmit.
• capacity - how many bytes the buffer holds.
• out_txpk - receives the packet that carries it.
• out_len - receives how many bytes were written.

Returns

PamojaStatus::Ok, PamojaStatus::InvalidArgument for a null argument or a buffer too small, or PamojaStatus::Codec when no session is held for the address.

Safety

network must be a live handle, payload must point at payload_len readable bytes or be null, buffer must point at capacity writable bytes or be null, and both outputs must be writable.