Why does list-attributes in bluetoothctl elicit no reply

I have a Digi i.MX6UL starter kit and a HRM strapped to my chest. If I fire up bluetoothctl I get:
root@ccimx6ulstarter:~# bluetoothctl
[NEW] Controller 00:04:F3:06:D8:AF cc6ul [default]
[NEW] Device 00:15:83:EC:AA:39 RWOODHAM2
[NEW] Device 62:80:E1:00:7B:88 Geonaute BLE HRM
[bluetooth]# connect 62:80:E1:00:7B:88
Attempting to connect to 62:80:E1:00:7B:88
[CHG] Device 62:80:E1:00:7B:88 Connected: yes
Connection successful
[CHG] Device 62:80:E1:00:7B:88 Paired: yes
[Geonaute BLE HRM]# list-attributes
[Geonaute BLE HRM]#

i.e nothing

I can get the Geonaute to work with a competitor product (so I think the chest belt is working OK), why not on yours?

#Version 5.41

On the competitor the version is 5.43 I think, so not so very different.

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