fn consume<'a, I: Iterator<Item = &'a [u8]>>(packets: I) {
    // do something with the packets
}

fn main() {
    let msg1: &[u8] = &vec![1, 2, 3, 4, 5];
    let msg2: &[u8] = &vec![1, 2, 3, 4, 5];
    let msg3: &[u8] = &vec![1, 2, 3, 4, 5];

    let packets = vec![msg1, msg2, msg3].iter();
    consume(packets);
}