Q24+ Wip POP3

Legacy Open AT
1

I’m trying to use examples from WIP_Open_AT_IP_Connectivity_Development_Guide_V3_00.pdf to pop my e-mail.
My problem is wip_read command always return 0.

int ReadBytes;  
    ReadBytes = wip_read( pPop3ClientCtx->DataChannel, 
                          pPop3ClientCtx->pdataBuffer, 
                          pPop3ClientCtx->dataLengthMax );

Someone may help me about this ?