Function build_aprs_item_packet 

pub fn build_aprs_item_packet(
    source: &Ax25Address,
    name: &str,
    live: bool,
    lat: f64,
    lon: f64,
    symbol_table: char,
    symbol_code: char,
    comment: &str,
    path: &[Ax25Address],
) -> Ax25Packet

Like build_aprs_item but returns the unencoded [Ax25Packet].