Remove service runtime

[stefano055415]

I have an accessory with N services, is it possible to remove one more at runtime?

[shahpiyushv]

@stefano055415 , an API can be provided for that, but we haven't done so, since there wasn't any need for that. What's your use case?

[stefano055415]

I have a device that can be used as an outlet or as a switch, and can be configured at runtime, so when I change from switch to outlet, i would like to update the accessory on homekit

[shahpiyushv]

Better to set something in NVS and just reboot and set appropriate services? Even the category identifier can be correctly updated between HAP_CID_SWITCH/HAP_CID_OUTLET then.

Or implement accessory as a bridge and add/remove a switch/outlet as a bridged accessory as applicable?

[stefano055415]

I tried to save and reboot, but on homekit it doesn't work anymore

If I update a service, from switch to outlet and reboot, hap duplicates the services and they are unreachable

If I restart without changing the services everything works fine

[shahpiyushv]

@stefano055415 , Can you try calling hap_update_config_number() after you reboot into the firmware wherein the services have changed? Did you try the bridge option?

[stefano055415]

I have try to call hap_update_config_number() but not working
I don’t try bridge, because we have other devices like lock that can not be included as bridge

[stefano055415]

Ok I found the problem.
On the function:
hap_acc_t * hap_acc_create (hap_acc_cfg_t * acc_cfg)
next_iid is fixed at 1

if I change the service from switch to outlet and reboot it doesn't work.
but if I increase the next_iid = 100, for example, and reboot everything works fine.

is it possible to implement this fix in the next update?
Thank you

[shahpiyushv]

@stefano055415 , I will check and add support as appropriate. For the time being, even though they could be cumbersome to use, can you check if hap_char_set_iid() and hap_char_set_iid() suit your purpose? These have to be called for every service/characteristic though, to set some hard-coded value for them.

[stefano055415]

ok thanks I try to see if so I can solve for the moment.

if you want as soon as you are able to introduce this new function, I would be happy to be able to test it

[shahpiyushv]

@stefano055415 , can you apply this next_iid_patch.txt and see if the hap_acc_set_next_iid() API serves your purpose?

[stefano055415]

with this patch, everything seems to work.

I just made a small change

void hap_acc_set_next_iid (hap_acc_t * ha, uint32_t next_iid)
{
if (ha) {
((__hap_acc_t *) ha) -> next_iid = ((__hap_acc_t *) ha) -> next_iid + next_iid;
}
}

every time I make a change (from switch to outlet for example), I increase a value and save it in nvs.
on next reboot I use this value to keep the iids unchanged

accessory = hap_acc_create(&cfg);
hap_acc_set_next_iid(accessory, nvs_read_config_version());

[shahpiyushv]

@stefano055415 Changing the API as above would be too use case specific and non deterministic. Setting a fixed value for next_iid would suit even those use cases wherein services may have changed across fw upgrades, but the iid values need to be retained as per HAP requirements. Since value of next_iid after calling hap_acc_create() would be the same each time, wouldn't it be convenient if you manage that offset in your app, instead of doing it inside the API?

[stefano055415]

ok I understand, however for my needs it is fine.
I call the function N times and it works.

I have another problem with apple tests.

Could you help me?

[shahpiyushv]

@stefano055415 , are you working on a commercial HomeKit product? If yes, as indicated in the README, please get in touch with us here to get access to the MFi variant of the SDK. The above tests would pass with that.

Moreover, please also get your use case confirmed from Apple. I am not sure if they would allow this runtime service change.

[stefano055415]

ok thanks, I proceeded to make the request.