m-net /mnt/usb/torrent # transmission-cli xxx.torrent 
transmission-cli 2.33 (12565)
[10:08:25.012] Transmission 2.33 (12565) started
[10:08:25.015] RPC Server: Adding address to whitelist: 127.0.0.1
[10:08:25.020] Couldn't bind port 51413 on 0.0.0.0: Address already in use (Is another copy of Transmission already running?)
[10:08:25.023] UDP: Couldn't bind IPv4 socket
[10:08:25.024] DHT: Generating new id
[10:08:25.123] xxx: No data found! Ensure your drives are connected or use "Set Location". To re-download, remove the torrent and re-add it.
[10:08:25.125] Couldn't save temporary file "/root/.config/transmission/torrents/xxx.8f8d94e812800736.torrent.tmp.iBnMlv": No such file or directory
[10:08:25.126] xxx: Unable to save torrent file: No such file or directory
[10:08:25.129] xxx: No data found! Ensure your drives are connected or use "Set Location". To re-download, remove the torrent and re-add it.
[10:08:25.130] xxx: No data found! Ensure your drives are connected or use "Set Location". To re-download, remove the torrent and re-add it.
[10:08:25.333] Couldn't save temporary file "/root/.config/transmission/settings.json.tmp.vXNwjO": No such file or directory

[10:08:25.334] DHT: Not saving nodes, DHT not ready
[10:08:25.334] Port Forwarding: Stopped
[10:08:25.334] xxx: Removing torrent
[10:08:25.334] xxx: Pausing

# cat /etc/config/transmission 
config transmission
    option enabled 1
    option config_dir '/mnt/usb/torrent/config'
    option run_daemon_as_user root
    option alt_speed_down 50
    option alt_speed_enabled false
    option alt_speed_time_begin  540
    option alt_speed_time_day 127
    option alt_speed_time_enabled false
    option alt_speed_time_end 1020
    option alt_speed_up 50
    option bind_address_ipv4 '0.0.0.0'
    option bind_address_ipv6 '::'
    option blocklist_enabled false
    option alt_speed_down 50
    option alt_speed_enabled false
    option alt_speed_time_begin  540
    option alt_speed_time_day 127
    option alt_speed_time_enabled false
    option alt_speed_time_end 1020
    option alt_speed_up 50
    option bind_address_ipv4 '0.0.0.0'
    option bind_address_ipv6 '::'
    option blocklist_enabled false
    option blocklist_url ''
    option cache_size_mb 2
    option dht_enabled true
    option download_dir '/mnt/usb/torrent/download'
    option encryption 1
    option idle_seeding_limit 30
    option idle_seeding_limit_enabled false
    option incomplete_dir '/mnt/usb/torrent/incomplete'
    option incomplete_dir_enabled false
    option lazy_bitfield_enabled true
    option lpd_enabled false
    option message_level 1
    option open_file_limit 32
    option peer_congestion_algorithm ''
    option peer_limit_global 240
    option peer_limit_per_torrent 60
    option peer_port 51413
    option peer_port_random_high 65535
    option peer_port_random_low 49152
    option peer_port_random_on_start false
    option peer_socket_tos 0
    option pex_enabled true
    option port_forwarding_enabled true
    option preallocation 1
    option prefetch_enabled 1
    option ratio_limit 2.0000
    option ratio_limit_enabled false
    option rename_partial_files true
    option rpc_authentication_required true
    option rpc_bind_address '0.0.0.0'
    option rpc_enabled true
    option rpc_password ''
    option rpc_port 9091
    option rpc_url '/mnt/usb/torrent'
    option rpc_username ''
    option rpc_whitelist '127.0.0.1,192.168.1.*,10.0.0.*'
    option rpc_whitelist_enabled true
    option script_torrent_done_enabled false
    option script_torrent_done_filename ''
    option speed_limit_down 100
    option speed_limit_down_enabled false
    option speed_limit_up 20
    option speed_limit_up_enabled false
    option start_added_torrents true
    option trash_original_torrent_files false
    option umask 18
    option upload_slots_per_torrent 14
    option utp_enabled true
    option scrape_paused_torrents true
    option watch_dir_enabled false
    option watch_dir ''

transmission-cli -g /mnt/usb/torrent/config/ad -D -w /mnt/usb/torrent/download/ -u 50 xxx.torrent