aci_gatt_update_char_value never returns

[BStic.1]

I am trying to send a BLE notification after I have connected.

I add the characteristic this way.

 retVal = aci_gatt_add_char(serviceHandle,
 UUID_TYPE_128,
 (const Char_UUID_t *)Uuid,
 247,
 CHAR_PROP_WRITE_WITHOUT_RESP | CHAR_PROP_WRITE | CHAR_PROP_NOTIFY,
 ATTR_PERMISSION_NONE,
 GATT_NOTIFY_ATTRIBUTE_WRITE,
 MAX_ENCRY_KEY_SIZE, 
 CHAR_VALUE_LEN_VARIABLE,
 &handle);

Then the connected device writes a small amount of data to the characteristic (3 bytes), and I try to send a notification in response.

result = aci_gatt_update_char_value(serviceHandle, valueHandle, 0, length, pData);

The notification is about 80 bytes long. I get the notification data on the other side, but the call to aci_gatt_update_char_value never returns. It gets stuck in hci_send_req waiting for something to happen, and it never happens. This seems like it would be super simple. What am I doing wrong here?

Thanks

[BStic.1]

Whoops, calling from critical section, dont do that....