pending.app_data[len..len + 2].copy_from_slice(&packet_crc.to_be_bytes());
pending.app_data_len = len + 2;
pending.lsf = Some(LsfFrame::new_packet(
pending.app_data[len..len + 2].copy_from_slice(&packet_crc.to_be_bytes());
pending.app_data_len = len + 2;
pending.lsf = Some(LsfFrame::new_packet(