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Fix UDP send to IPv6 link local addresses (#6541)

lwIP's tcp/udp_connect() and tcp/udp_bind() functions automaticallyset the zone if it is required but missing, but udp_connect() is notused so this doesn't happen.Explicitly set the zone to the default network interface if it isrequired for the type of address being used. Otherwise there is nozone set and packets to a link local destination don't go anywhere.

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libraries/ESP8266WiFi/src/include
- UdpContext.h

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`‎libraries/ESP8266WiFi/src/include/UdpContext.h‎`

Lines changed: 6 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -114,6 +114,12 @@ class UdpContext`
`114`	`114`	`{`
`115`	`115`	`_pcb->remote_ip = addr;`
`116`	`116`	`_pcb->remote_port = port;`
	`117`	`+#if LWIP_IPV6`
	`118`	`+// Set zone so that link local addresses use the default interface`
	`119`	`+if (IP_IS_V6(&_pcb->remote_ip) &&ip6_addr_lacks_zone(ip_2_ip6(&_pcb->remote_ip), IP6_UNKNOWN)) {`
	`120`	`+ip6_addr_assign_zone(ip_2_ip6(&_pcb->remote_ip),IP6_UNKNOWN, netif_default);`
	`121`	`+ }`
	`122`	`+#endif`
`117`	`123`	`returntrue;`
`118`	`124`	`}`
`119`	`125`

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Commitee619d3

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`‎libraries/ESP8266WiFi/src/include/UdpContext.h‎`

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