Reading GATT characteristic notification not possible

[Волк Тамбовский]

Hi.

Corresponding to the discussion at https://groups.google.com/g/automate-user/c/C_K7bBA-PgQ/m/4ZiOX9aZJgAJ...

I have some bluetooth device with a custom characteristic notification, which value I want to use as a trigger.

nRF Connect and LightBlue are showing the notification messages, but when I try Automate I get "java.io.IOException: Read not permitted"...

I'm new to Automate, so any advice would be very apreciated.

[Волк Тамбовский]

Just found a similar request without solution on Reddit: https://www.reddit.com/r/AutomateUser/comments/15iszot/bt_gatt_read_read_not_permitted_exception/

понедельник, 29 января 2024 г. в 08:33:36 UTC+1, Волк Тамбовский:

[Henrik "The Developer" Lindqvist]

As the documentation say, "If the proceed option is set to Immediately, then the fiber will proceed when the characteristic value has been read", this requires READ permission.

To await a NOTIFY or INDICATE use Proceed=When changed instead.

[Волк Тамбовский]

Oh, sorry, this was my understanding failure...)))

Just one more thing: can you advice me how to get the message values in hex format, like in nRF Connect?

понедельник, 29 января 2024 г. в 11:40:44 UTC+1, Henrik "The Developer" Lindqvist:

[Волк Тамбовский]

I mean that I want to make the trigger depend on the value of the exact hex value message.

As I said, I'm new to Automate...

понедельник, 29 января 2024 г. в 12:13:48 UTC+1, Волк Тамбовский:

[Henrik "The Developer" Lindqvist]

There's no such thing as hex format, it's just the way nRF connect choose to display the whole characteristics data as binary.

The Bluetooth GATT read block works on a single value in a characteristic, not the whole data.

[Волк Тамбовский]

Oh...
So there is no possibility to make a value dependent trigger?

It is so: the service on my device is indicating the charging state (wether device is actually charging or not) and I see in nRF Connect this value changing when I put it to its charging station and changing back when I put it down from charging - I need to difference between this both states and to perform different actions when device is charging and when it's not.

So, you say, no possibility to achieve this? Do I understand right?

понедельник, 29 января 2024 г. в 12:32:27 UTC+1, Henrik "The Developer" Lindqvist:

[Henrik "The Developer" Lindqvist]

As it works now is "value dependent", you choose the characteristic, its value format and offset.

[Волк Тамбовский]

Yes, just managed it.)))
Sorry for dumb questions and thanks a lot for your time and your support!

понедельник, 29 января 2024 г. в 12:46:14 UTC+1, Henrik "The Developer" Lindqvist: