Constant GATT_CLIENT_NOTIFICATION_MTU 

pub const GATT_CLIENT_NOTIFICATION_MTU: usize = raw::GATT_CLIENT_NOTIFICATION_MTU; // 512usize

Payload capacity of each queued GATT client notification.

Default: min(PacketPool::MTU - 7, 512) when default-packet-pool-mtu-* is enabled, else 512.