improve frappy server management

- do connect in background when the frappy server is not running
  on startup

commands.py

@@ -22,7 +22,8 @@
 from nicos import session, config
 from nicos.utils import printTable
 from nicos.commands import helparglist, usercommand
-from servicemanager import FrappyManager
+from .devices import get_frappy_config, all_info
+from servicemanager import FrappyManager, SeaManager
 
 
 SERVICES = FrappyManager.services
@@ -30,8 +31,9 @@ SERVICES = FrappyManager.services
 
 @usercommand
 def set_se_list():
-    frappy_config = session.devices['frappy_config']
-    frappy_config.set_envlist()
+    fc = get_frappy_config()
+    if fc:
+        fc.set_envlist()
 
 
 @usercommand
@@ -47,7 +49,11 @@ def frappy(*args, main=None, stick=None, addons=None, force=False):
     - frappy('restart')         # restart all frappy servers
     - frappy(stick='restart')   # restart stick frappy server
     """
-    confirmed = FrappyManager().cfg_from_sea(config.instrument).get('confirmed')
+    fc = get_frappy_config()
+    if not fc:
+        return
+    stickarg = stick
+    confirmed = SeaManager().get_cfg(config.instrument, 'sea', True).split('/', 1)[0]
     if args:
         if main is not None:
             raise TypeError('got multiple values for main')
@@ -60,9 +66,8 @@ def frappy(*args, main=None, stick=None, addons=None, force=False):
                 if main == '':
                     stick = ''  # remove stick with main
                 else:
-                    allsticks = FrappyManager().all_cfg(config.instrument, 'stick')
                     stickcfg = main + 'stick'
-                    if stickcfg in allsticks:
+                    if FrappyManager().is_cfg(config.instrument, 'stick', stickcfg):
                         # if a default stick is available, start this also
                         stick = stickcfg
                     else:
@@ -75,12 +80,30 @@ def frappy(*args, main=None, stick=None, addons=None, force=False):
                 if addons is not None:
                     raise TypeError('got multiple values for addons')
                 addons = ','.join(alist)
+    elif main is None and stick is None and addons is None:  # bare frappy() command
+        fc.show_config(fc.check_services())
+        return
     if confirmed and confirmed != main and main not in (None, 'restart') and not force:
         session.log.warning('%r is plugged to the cryostat control rack', confirmed)
-        session.log.warning('if you are sure, use frappy(..., force=True)', confirmed)
+        cmd = all_info({'main': main, 'stick': stickarg, 'addons': addons}, '')[:-1] + ', force=True)'
+        session.log.warning(f'if you are sure, use: %s', cmd)
         raise TypeError('refuse to override plugged device')
-    frappy_config = session.devices['frappy_config']
-    frappy_config.show_config(*frappy_config.check_or_start(main, stick, addons))
+    fc.show_config(fc.start_services(main, stick, addons))
+
+
+@usercommand
+def frappy_main(*args):
+    raise NameError('frappy_main(<cfg>) is no longer avaiable, use frappy(<cfg>) instead')
+
+
+@usercommand
+def frappy_stick(*args):
+    raise NameError('frappy_stick(<cfg>) is no longer avaiable, use frappy(stick=<cfg>) instead')
+
+
+@usercommand
+def frappy_addons(*args):
+    raise NameError('frappy_addons(<cfg>) is no longer avaiable, use frappy(addons=<cfg>) instead')
 
 
 @usercommand
@@ -108,4 +131,6 @@ def frappy_list(service=None):
 
 @usercommand
 def frappy_changed():
-    session.devices['frappy_config'].changed()
+    fc = get_frappy_config()
+    if fc:
+        fc.changed()