suites/4g: Wait for IP addr received before trying to use the link
Otherwise processes using the link like "ping" or "iperf3" may fail
because there's still no IP address assigned.
Change-Id: I28137f10a19db01fe90b24830a60342a448d1e92
diff --git a/sysmocom/suites/4g/iperf3_dl.py b/sysmocom/suites/4g/iperf3_dl.py
index 055ce97..26df79b 100755
--- a/sysmocom/suites/4g/iperf3_dl.py
+++ b/sysmocom/suites/4g/iperf3_dl.py
@@ -26,7 +26,7 @@
proc = iperf3cli.prepare_test_proc(iperf3cli.DIR_DL, ue.netns(), bitrate=max_rate)
print('waiting for UE to attach...')
-wait(ue.is_rrc_connected)
+wait(ue.is_registered)
print('UE is attached')
print("Running iperf3 client to %s through %s" % (str(iperf3cli), ue.netns()))