TFTP READ

Op-Code: PXENV_TFTP_READ
Input: ES:DI points to a t_PXENV_TFTP_READ parameter structure that has been initialized by the caller.
Output: PXENV_EXIT_SUCCESS or PXENV_EXIT_FAILURE will be returned in AX, with the CF set accordingly. The status field in the parameter structure will be set to one of the values represented by the PXENV_STATUS_xxx constants. When a read is successful, the PacketNumber and PacketLength fields will also be filled in.
Description: Reads one packet from the open TFTP connection.