Polls for tags with number of time slots, returns NFCID2 list of detected tags (maximum 16 / length 8). 
- Parameters
 - 
  
    | [in] | protocol | used to execute the command  | 
    | [in] | FastBaud | Baudrate PCD-PICC.  | 
    | [in] | SystemCode | Application ID for PICC preselection, All:0xFFFF.  | 
    | [in] | RequestCode | RequestCode.  | 
    | [out] | ColFlag | True if collision occurs.  | 
    | [out] | Labels |  | 
    | [out] | Labels_len |  | 
    | [in] | mempool | is used to store response data. Maybe NULL to use an internal mempool, in this case the data is only available until another command uses the internal mempool  |