<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def fetch_platform_informations(self, callback):
 """ Fetch platform info from the firmware Should be called at the earliest in the connection sequence """


        self._protocolVersion = -1
        self._callback = callback

        self._request_protocol_version()