POP3 Wip_read always returns 0

Legacy Open AT
1

Hello,

I’m using the WIP-plugin to reading mail from a POP3 Server.
The connection to the server works without problems.
But when i use the wip_read functions :

case WIP_CEV_READ:
      pop3_ClientTestListReadHandler();
      break;


void pop3_ClientTestListReadHandler(void)
{
	ascii WDHRSP[50];
  pop3_ClientTestCtx_t *pPop3ClientCtx = (pop3_ClientTestCtx_t *)&pop3_ClientTestCtx;

  // While there are DATA to read
  // ----------------------------
  while( pPop3ClientCtx->listdataLengthMax > 0 )
  {
    int ReadBytes;  
    ReadBytes = wip_read( pPop3ClientCtx->ListChannel, 
                          pPop3ClientCtx->plistdataBuffer, 
                          pPop3ClientCtx->listdataLengthMax );

	sprintf(WDHRSP, "pop3_ClientTestListReadHandler: read %d/%d \r\n",  
            ReadBytes, pPop3ClientCtx->listdataLength);
	ADL_SEND_RSP(WDHRSP);

    if (ReadBytes <= 0)
    { 
      // If wip_read() not ready or failed, end loop
      break;
    }
    /*
    // Display the FileInfo
    wip_debug( "MailId %s is %i bytes long.\n"
                 fi->entries[WIP_FOPT_NAME].ascii,
                 fi->entries[WIP_FOPT_SIZE].u32);

    */

    // Update current pointer and length
    pPop3ClientCtx->plistdataBuffer    += ReadBytes;
    pPop3ClientCtx->listdataLengthMax  -= ReadBytes;
    pPop3ClientCtx->listdataLength     += ReadBytes;
  }
}

Unfortunately, ReadBytes is always 0,

Can you help me ?

Thanks