refine logic of do_open

a6f60178 · Juan David González Cobas · bf6ef84a · a6f60178
Commit a6f60178 authored Nov 09, 2021 by Juan David González Cobas
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oautest software/lib/oautest +5 -1

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--- a/software/lib/oautest
+++ b/software/lib/oautest
@@ -97,7 +97,11 @@ class OauTest(cmd.Cmd):

    def do_open(self, arg):
        """open device by serial number."""
-        serial = self.devices[0]['serial'] if not arg else arg
+        try:
+            serial = self.devices[0]['serial'] if not arg else arg
+        except IndexError as e:
+            print('no devices found, cannot open')
+            return
        fd = self.api.oau_att_open_by_serial(bytes(serial, 'utf8'))
        if fd < 0:
            print('cannot open device {}'.format(serial))