ARGOMENTO:

sudo prime-select intel
sudo service lightdm restart
sudo prime-select nvidia

sudo service boinc-client restart

while true
do
  if boinccmd --get_tasks|grep -q "state: downloading"; then boinccmd --network_available; fi
  sleep 10
done

$ boinccmd --help

usage: boinccmd [--host hostname] [--passwd passwd] [--unix_domain] command

default hostname: localhost
default password: contents of gui_rpc_auth.cfg
Commands:
 --acct_mgr attach URL name passwd  attach to account manager
 --acct_mgr info                    show current account manager info
 --acct_mgr sync                    synchronize with acct mgr
 --acct_mgr detach                  detach from acct mgr
 --client_version                   show client version
 --create_account URL email passwd name
 --file_transfer URL filename op    file transfer operation
   op = retry | abort
 --get_app_config URL               show app config for given project
 --get_cc_status
 --get_daily_xfer_history           show network traffic history
 --get_disk_usage                   show disk usage
 --get_file_transfers               show file transfers
 --get_host_info
 --get_message_count                show largest message seqno
 --get_messages [ seqno ]           show messages > seqno
 --get_notices [ seqno ]            show notices > seqno
 --get_project_config URL
 --get_project_status               show status of all attached projects
 --get_proxy_settings
 --get_simple_gui_info              show status of projects and active tasks
 --get_state                        show entire state
 --get_tasks                        show tasks
 --get_old_tasks                    show reported tasks from last 1 hour
 --join_acct_mgr URL name passwd    same as --acct_mgr attach
 --lookup_account URL email passwd
 --network_available                retry deferred network communication
 --project URL op                   project operation
   op = reset | detach | update | suspend | resume | nomorework | allowmorework | detach_when_done | dont_detach_when_done
 --project_attach URL auth          attach to project
 --quit                             tell client to exit
 --quit_acct_mgr                    same as --acct_mgr detach
 --read_cc_config
 --read_global_prefs_override
 --reset_host_info                  have client get mem size, #CPUs etc. again
 --run_benchmarks
 --run_graphics_app id op         (Macintosh only) run, test or stop graphics app
   op = run | runfullscreen | stop | test
   id = slot # for run or runfullscreen, process ID for stop or test
   id = -1 for default screensaver (boincscr)
 --set_gpu_mode mode duration       set GPU run mode for given duration
   mode = always | auto | never
 --set_host_info product_name
 --set_network_mode mode duration   set network mode for given duration
   mode = always | auto | never
 --set_proxy_settings
 --set_run_mode mode duration       set run mode for given duration
   mode = always | auto | never
 --task url task_name op            task operation
   op = suspend | resume | abort