[pox-dev] ICMP type packet

[Anees Mohsin Hadi Al-Najjar]

Dear All,
    I'm new with POX. I'm trying to write manually an ICMP reply packet. Could 
you possibly inform me How I can check the type of ICMP packet is echo-request? 
I find it difficult because there is no payload in ofp_match

Thanks
  Anees Al-Najjar