Mos tool over mqtt with customized topic not working

General
1
  1. My goal is: Customize my own MQTT topic and remote license
  2. My actions are: In mos.yml I changed,
    - ["rpc.mqtt_pub_topic", "K/%.*s/rpc"]
    - ["rpc.mqtt_sub_topic", "K/%.*s/rpc"]

Build and flash it, all perfect, but not work for following command

    mos --port mqtt://mysite.foo/K/deviceId call Sys.GetInfo
  1. The result I see is:
    Error: context deadline exceeded
/build/mos-YUowqD/mos-2.16.0+adcad3f~bionic0/go/src/github.com/mongoose-os/mos/common/mgrpc/mgrpc.go:460: 
/build/mos-YUowqD/mos-2.16.0+adcad3f~bionic0/go/src/github.com/mongoose-os/mos/mos/dev/dev_conn_impl.go:167: 
/build/mos-YUowqD/mos-2.16.0+adcad3f~bionic0/go/src/github.com/mongoose-os/mos/mos/dev/dev_conn_impl.go:180: 
/build/mos-YUowqD/mos-2.16.0+adcad3f~bionic0/go/src/github.com/mongoose-os/mos/mos/main.go:196: call failed

In mos console, I could see:

    mg_rpc.c:293            Sys.GetInfo via MQTT
  1. My expectation & question is:
    If drop those two lines in mos.yml, all behavior as expected,
    but I do need to distinct different path.
    I guess that’s bug of mos tool, cause all rpc call using my program work perfect except mos command.