enb: Implement initial RF emulation API
Two implementations are provided:
* Amarisoft Ctrl interface (websocket)
* Mini-Circuits Programmable Attenuator (HW, HTTP API) [1]
in Amarisoft ENBs, if no rfemu is configured explicitly, the Ctrl
interface one is used by default, while still being possible to use the
HW one.
[1] https://www.minicircuits.com/pdfs/RC4DAT-6G-60.pdf
Change-Id: Ie98a3fb9bcd2b87b96ecbb5b79e0f53981892a32
diff --git a/src/osmo_gsm_tester/obj/rfemu_amarisoftctrl.py b/src/osmo_gsm_tester/obj/rfemu_amarisoftctrl.py
new file mode 100644
index 0000000..87e4cbd
--- /dev/null
+++ b/src/osmo_gsm_tester/obj/rfemu_amarisoftctrl.py
@@ -0,0 +1,62 @@
+# osmo_gsm_tester: class defining a RF emulation object implemented using Amarisoft Ctl interface
+#
+# Copyright (C) 2020 by sysmocom - s.f.m.c. GmbH
+#
+# Author: Pau Espin Pedrol <pespin@sysmocom.de>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+
+import json
+from websocket import create_connection
+
+from ..core import log
+from .rfemu import RFemulation
+
+class RFemulationAmarisoftCtrl(RFemulation):
+##############
+# PROTECTED
+##############
+ def __init__(self, conf):
+ super().__init__(conf, 'amarisoftctl')
+ self.addr = conf.get('addr')
+ self.port = conf.get('ports')
+ if self.addr is None:
+ raise log.Error('No "addr" attribute provided in supply conf!')
+ if self.port is None or len(self.port) != 1:
+ raise log.Error('No "port" attribute provided in supply conf!')
+ self.port = self.port[0]
+ self.set_name('amarisoftctl(%s:%d)' % (self.addr, self.port))
+ self.cell_id = conf.get('cell_id')
+ if self.cell_id is None:
+ raise log.Error('No "cell_id" attribute provided in supply conf!')
+ self.ws = create_connection("ws://%s:%s" % (self.addr, self.port))
+
+ def __del__(self):
+ self.dbg('closing CTRL websocket')
+ self.ws.close()
+
+#############################
+# PUBLIC (test API included)
+#############################
+ def set_attenuation(self, db):
+ msg = { "message": "cell_gain", "cell_id": int(self.cell_id), "gain": -db }
+ msg_str = json.dumps(msg)
+ self.dbg('sending CTRL msg: "%s"' % msg_str)
+ self.ws.send(msg_str)
+ self.dbg('waiting CTRL recv...')
+ result = self.ws.recv()
+ self.dbg('Received CTRL msg: "%s"' % result)
+
+
+# vim: expandtab tabstop=4 shiftwidth=4