add source for rf103 (experimental)

owrx/source/rf103.py

@@ -0,0 +1,15 @@
+from owrx.source.direct import DirectSource
+from owrx.command import Option
+import time
+
+
+class Rf103Source(DirectSource):
+    def getCommandMapper(self):
+        return super().getCommandMapper().setBase("rf103_sdr -i /home/jakob/workspace/RF103/rx888.img").setMappings({
+            "samp_rate": Option("-s"),
+            "center_freq": Option("-f"),
+            "attenuation": Option("-a"),
+        })
+
+    def sleepOnRestart(self):
+        time.sleep(1)