James Allen

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7 years, 5 months ago.

BLE gattServer onUpdatesEnabled callback type

Hi,

Sorry for the really simple beginners question, but I'm trying to register a callback to the BLE API's GATT server event 'onUpdatesEnabled'.

A BLE instance is the main class for working with Bluetooth LE:

BLE &ble = BLE::Instance();

The BLE object exposes the GATT server, which has a function for registering callbacks for its onUpdatesEnabled event. The signature of the function is:

void onUpdatesEnabled(EventCallback_t callback)

The EventCallback_t type is defined as:

typedef FunctionPointerWithContext<GattAttribute::Handle_t> EventCallback_t;

So, I've created a function called onUpdatesEnabledCallback like so:

void onUpdatesEnabledCallback(GattAttribute::Handle_t *handle)
{
    // Do stuff
}

and I try to register the callback using:

ble.gattServer().onUpdatesEnabled(onUpdatesEnabledCallback);

But I get the following compile error:

Quote:

Error: No suitable constructor exists to convert from "void (GattAttribute::Handle_t *)" to "FunctionPointerWithContext<GattAttribute::Handle_t>" in "ButtonService.h", Line: 47, Col: 44

What am I missing please?

Thanks

1 Answer

Kunta H
7 years, 3 months ago.

The method should be void onUpdatesEnabledCallback(GattAttribute::Handle_t handle) { Do stuff }

The parameter is the handle, not pointer to handle.