Returns a string like NN:MMMMMMMM;NN:MMMMMMMM;...
            for the T response string.  NN is the index of the
            register to follow MMMMMMMM is the value of the register.

def get_reg_index_value_pairs(self, regIndexList):
        """
        Returns a string like NN:MMMMMMMM;NN:MMMMMMMM;...
            for the T response string.  NN is the index of the
            register to follow MMMMMMMM is the value of the register.
        """
        str = b''
        regList = self._context.read_core_registers_raw(regIndexList)
        for regIndex, reg in zip(regIndexList, regList):
            str += six.b(conversion.byte_to_hex2(regIndex) + ':' + conversion.u32_to_hex8le(reg) + ';')
        return str