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att_read_callback_t
ATT Client Read Callback for Dynamic Data - if buffer == NULL, don't copy data, just return size of value - if buffer != NULL, copy data and return number bytes copied If ENABLE_ATT_DELAYED_READ_RESPONSE is defined, you may return ATT_READ_RESPONSE_PENDING if data isn't available yet
Syntax
typedef uint16_t (*att_read_callback_t)(hci_con_handle_t con_handle, uint16_t attribute_handle, uint16_t offset, uint8_t * buffer, uint16_t buffer_size);