fake_trx: fix compatibility with Python 3

Change-Id: Idce0c631aa3fcd20092a3773558570e442b2fec8

src/target/fake_trx/clck_gen.py

@@ -94,7 +94,7 @@ class Application:
 		self.clck.start()
 
 	def sig_handler(self, signum, frame):
-		print "Signal %d received" % signum
+		print("Signal %d received" % signum)
 		if signum is signal.SIGINT:
 			self.clck.stop()
 			self.link.shutdown()

src/target/fake_trx/ctrl_cmd.py

@@ -54,7 +54,7 @@ class Application:
 
 			if self.ctrl_link.sock in r_event:
 				data, addr = self.ctrl_link.sock.recvfrom(128)
-				sys.stdout.write("\r%s\n" % data)
+				sys.stdout.write("\r%s\n" % data.decode())
 				sys.stdout.flush()
 
 	def handle_cmd(self, cmd):

src/target/fake_trx/fake_trx.py

@@ -114,12 +114,12 @@ class Application:
 			# CTRL commands from BTS
 			if self.bts_ctrl.sock in r_event:
 				data, addr = self.bts_ctrl.sock.recvfrom(128)
-				self.bts_ctrl.handle_rx(data)
+				self.bts_ctrl.handle_rx(data.decode())
 
 			# CTRL commands from BB
 			if self.bb_ctrl.sock in r_event:
 				data, addr = self.bb_ctrl.sock.recvfrom(128)
-				self.bb_ctrl.handle_rx(data)
+				self.bb_ctrl.handle_rx(data.decode())
 
 	def shutdown(self):
 		print("[i] Shutting down...")

src/target/fake_trx/udp_link.py

@@ -41,12 +41,15 @@ class UDPLink:
 		# Check for incoming data
 		if self.sock in r_event:
 			data, addr = self.sock.recvfrom(128)
-			self.handle_rx(data)
+			self.handle_rx(data.decode())
 
 	def shutdown(self):
 		self.sock.close();
 
 	def send(self, data):
+		if type(data) not in [bytearray, bytes]:
+			data = data.encode()
+
 		self.sock.sendto(data, (self.remote_addr, self.remote_port))
 
 	def handle_rx(self, data):