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[socket] remove & 0x0F to fix DHCP on W5500 #171

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[socket] remove & 0x0F to fix DHCP on W5500 #171

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2 changes: 1 addition & 1 deletion Ethernet/socket.c
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Original file line number Diff line number Diff line change
Expand Up @@ -199,7 +199,7 @@ int8_t socket(uint8_t sn, uint8_t protocol, uint16_t port, uint8_t flag) {
uint8_t taddr[16];
uint16_t local_port = 0;
CHECK_SOCKNUM();
switch (protocol & 0x0F) {
switch (protocol) {
#ifdef IPV6_AVAILABLE
case Sn_MR_TCP4 :
getSIPR(taddr);
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