diff --git a/base.py b/base.py
index 841127e..ea724a4 100644
--- a/base.py
+++ b/base.py
@@ -98,6 +98,7 @@ class Config:
     """merge info from linsetools.cfg and instrument.cfg"""
     this = None
     single_instrument = None
+    instrument = None
     ins_config = None
 
     def __init__(self, instrument=None):
@@ -132,6 +133,8 @@ class Config:
         if not self.this:
             self.this = self.single_instrument
 
+        if self.single_instrument:  # TODO: do we need this?
+            instrument = self.single_instrument
         if instrument:
             self.instance = instrument or 'this'
             self.instrument = self.this if self.instance == 'this' else self.instance
@@ -220,12 +223,13 @@ class MarcheControl:
     port = 8124
     otherarg = None
     argmap = {k: 'action' for k in ('start', 'restart', 'stop', 'gui', 'run', 'cli', 'list', 'listcfg', 'running')}
+    configcls = Config
 
     def __init__(self, instrument=None, host='localhost', port=None, user=None, config=None):
         self.config = config or Config(instrument)
         self.host = host
-        self.user = user or self.config.instrument  # SINQ instruments
-        if not (Path('/home') / self.user).is_dir():
+        self.user = user or list(self.config.instruments)[0]  # SINQ instruments
+        if not (Path('/home') / (self.user or 'undefined')).is_dir():
             self.user = 'l_samenv'
         if port is not None:
             self.port = port
@@ -294,7 +298,7 @@ class MarcheControl:
 
     @classmethod
     def do_on_ins(cls, args):
-        config = Config()
+        config = cls.configcls()
         argdict = config.parse_args(cls.argmap, args, cls.otherarg)
         instrument = argdict.pop('instrument', None)
         if instrument is None:
diff --git a/frappy.py b/frappy.py
index 0c84edd..37d81f8 100644
--- a/frappy.py
+++ b/frappy.py
@@ -1,7 +1,9 @@
 import re
 import os
+from socket import gethostname, gethostbyname
 from pathlib import Path
 from .base import MarcheControl, Logger, ArgError, write_content, Config
+from .normalizeuri import normalizeuri
 
 
 WRAPPER_CFG = """interface = '{port}'
@@ -15,6 +17,9 @@ class FrappyConfig(Config):
     log = None
     process_file = None
     SERVICE = {0: 'main', 1: 'stick'}
+    instrument = None
+    frappy_ports = ()
+    frappy_servers = ()
 
     def __init__(self, instrument=None, host='localhost'):
         super().__init__(instrument)
@@ -23,13 +28,11 @@ class FrappyConfig(Config):
         if not Path(self.wrapperdir).is_dir():
             raise ValueError(f'{self.wrapperdir} does not exist')
         self.cfgdirs = superconfig.get('cfgdirs')
-        if not self.ins_config:
-            raise ValueError(repr(instrument))
-        print(self.ins_config)
-        frappy_ports = self.ins_config.get('frappy_ports', '0')
-        ports = frappy_ports.split('-')
-        self.frappy_ports = list(range(int(ports[0]), int(ports[-1])))
-        self.frappy_servers = [f'{host}:{p}' for p in self.frappy_ports]
+        if self.ins_config:
+            frappy_ports = self.ins_config.get('frappy_ports', '0')
+            ports = frappy_ports.split('-')
+            self.frappy_ports = list(range(int(ports[0]), int(ports[-1])))
+            self.frappy_servers = [f'{host}:{p}' for p in self.frappy_ports]
 
     def service_from_uri(self, uri):
         try:
@@ -54,6 +57,7 @@ class FrappyControl(MarcheControl):
     services = {k: 'service' for k in ('main', 'stick', 'addons')}
     argmap = dict(MarcheControl.argmap, all='service', **services)
     otherarg = 'cfg'
+    configcls = FrappyConfig
 
     def __init__(self, instance, host='localhost', port=None, user=None, config=None):
         super().__init__(instance, host, port, user, config or FrappyConfig(instance))
@@ -149,8 +153,8 @@ class FrappyControl(MarcheControl):
         result = {}
         for cfgfile in Path(self.config.wrapperdir).glob('*_cfg.py'):
             ins, _, cfg = cfgfile.stem[:-4].rpartition('-')
-            ins = ins or self.config.single_instrument
-            if ins != self.config.instrument:
+            ins = ins or self.config.this
+            if ins != self.config.this:
                 continue
             match = WRAPPER_PAT.match(cfgfile.read_text())
             if match:
@@ -181,17 +185,16 @@ class FrappyControl(MarcheControl):
     def cli(self):
         self.get_cfg_info()
         from frappy.client.interactive import init, interact
-        # from frappy.protocol.discovery import scan
-        # if ins == self.single_ins:
-        #     all_nodes = {}
-        #     for node in nodes:
-        #         host, port = node.split(':')
-        #         if host == 'localhost':
-        #             host = gethostname()
-        #         all_nodes[gethostbyname(host), int(port)] = node
-        #     for a in scan():
-        #         all_nodes.setdefault((a.address, a.port), f'{a.hostname}:{a.port}')
-        #     nodes = list(all_nodes.values())
+        from frappy.protocol.discovery import scan
+        boxes = self.config.sections['boxes']
+        found = {}
+        for ans in scan():
+            uri = normalizeuri(f'{ans.hostname}:{ans.port}')
+            found[uri] = ans
+        for cfg, uri in boxes.items():
+            if uri in found:
+               self.cfg_info[uri] = cfg
+        print(self.cfg_info)
         init(*self.cfg_info)
         interact(appname=self.config.instrument)