python: get u2f counter

python/src/trezorlib/cli/trezorctl.py

@@ -412,6 +412,12 @@ def set_u2f_counter(connect, counter):
     return device.set_u2f_counter(connect(), counter)
 
 
+@cli.command(help="Get U2F counter.")
+@click.pass_obj
+def get_u2f_counter(connect):
+    return device.get_next_u2f_counter(connect())
+
+
 @cli.command(help="Reset device to factory defaults and remove all private data.")
 @click.option(
     "-b",

python/src/trezorlib/device.py

@@ -99,8 +99,12 @@ def sd_protect(client, operation):
 
 @expect(proto.Success, field="message")
 def set_u2f_counter(client, u2f_counter):
-    ret = client.call(proto.SetU2FCounter(u2f_counter=u2f_counter))
-    return ret
+    return client.call(proto.SetU2FCounter(u2f_counter=u2f_counter))
+
+
+@expect(proto.NextU2FCounter, field="u2f_counter")
+def get_next_u2f_counter(client):
+    return client.call(proto.GetNextU2FCounter())
 
 
 @expect(proto.Success, field="message")