Fix async ping #1
Merged
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From the W5500 IPRAW documentation (http://www.wizwiki.net/wiki/lib/exe/fetch.php/products:w5500:w5500_ap_ipraw_v100e.pdf):
'After initialization of W5500, the Ping Reply is processed automatically. However, be aware that the Hardwired Ping Reply Logic is disabled if ICMP is opened as SOCKET n in IPRAW mode.'