WARNING Error reading MCUMgr parameters

[fbeaulier]

(venv) [mypc]$ smpmgr --port /dev/ttyACM1 os reset
[15:08:10] WARNING Error reading MCUMgr parameters: header=Header(op=<OP.READ_RSP: init.py:503
1>, version=<Version.V2: 1>, flags=<Flag.UNUSED: 0>, length=6,
group_id=0, sequence=0, command_id=6) version=<Version.V2: 1>
sequence=0
smp_data=b'\t\x00\x00\x06\x00\x00\x00\x06\xbfbrc\x08\xff'
rc=<MGMT_ERR.ENOTSUP: 8> rsn=None - init:503
⠋ Connecting to /dev/ttyACM1... OK
⠋ Waiting for response to ResetWrite... OK
OSManagementErrorV1(
header=Header(
op=<OP.WRITE_RSP: 3>,
version=<Version.V2: 1>,
flags=<Flag.UNUSED: 0>,
length=6,
group_id=0,
sequence=1,
command_id=5
),
version=<Version.V2: 1>,
sequence=1,
smp_data=b'\x0b\x00\x00\x06\x00\x00\x01\x05\xbfbrc\x00\xff',
rc=<MGMT_ERR.EOK: 0>,
rsn=None
)

[fbeaulier]

It displays this warning msg but it works fine

[jeppenodgaard]

I can verify:

$ smpmgr --ip 1.2.3.4 os reset
[11:45:41] WARNING  Error reading MCUMgr parameters: header=Header(op=<OP.READ_RSP: 1>, version=<Version.V2: 1>,             __init__.py:503
                    flags=<Flag.UNUSED: 0>, length=6, group_id=0, sequence=0, command_id=6) version=<Version.V2: 1>
                    sequence=0 smp_data=b'\t\x00\x00\x06\x00\x00\x00\x06\xbfbrc\x08\xff' rc=<MGMT_ERR.ENOTSUP: 8> rsn=None -
                    __init__:503

[jeppenodgaard]

The warning is printed if the server does not support reading mcumgr parameters:
https://docs.zephyrproject.org/latest/services/device_mgmt/smp_groups/smp_group_0.html#default-os-management-group

If Zephyr OS' server implementation is used this can be fixed by enabling MCUMGR_GRP_OS_MCUMGR_PARAMS.

[JPHutchins]

This is intended behavior meant to encourage users to enable the parameters on the server firmware, which is required to get best results.

https://docs.zephyrproject.org/latest/kconfig.html#CONFIG_MCUMGR_GRP_OS_MCUMGR_PARAMS

Perhaps we should add more information to the warning about why it's recommended?

[jeppenodgaard]

If I looked up the group and command I would have found the issue earlier by looking at https://docs.zephyrproject.org/latest/services/device_mgmt/smp_groups/smp_group_0.html#default-os-management-group.

I guess more information would not hurt but not strictly needed.