Do you intend to develop a wrapper on 706 so that you can send AT commands from a host? Could you explain your application requirements?
You can use 'WICED HCI' to send commands to the 20706 which is similar to sending AT commands.
What are the differences in application functionality between AT and HCI？ thanks.
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Well, there are a lot of differences. AT commands are standardized and pertain mostly to GSM/GPRS modem and mobile phones.
WICED HCI is a Cypress proprietary implementation which is oriented towards Bluetooth functionalities. Note that WICED HCI is different from the standard HCI defined in Bluetooth spec.
The lower level functionality is anyway application dependent. So you could use either of these command set to perform the set of operations.
If you could describe your intended application briefly, forum users can provide suggestions on how it can be implemented.