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Commitd6a76da

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fix(libraries/asyncudp): IPv4 ONLY listenMulticast() (#11444)
AsyncUDP::listenMulticast() properly receives packets sent to IPv4multicast addresses like 239.1.2.3, but it is not receiving packets sentto IPv6 multicast addresses like ff12::6ood:cafe.The root cause is a bit hidden: listen(NULL, port) would matchAsyncUDP::listen(const ip_addr_t *addr, uint16_t port), which calls_udp_bind(_pcb, addr, port), which uses the lwIP API to calludp_bind(struct udp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port) atthe end. If lwIP has LWIP_IPV4 enabled, it checks if ipaddr == NULL andsets it to IP4_ADDR_ANY. So an IPv6 address is never bound.This fix checks the IP address passed to AsyncUDP::listenMulticast(). Ifit is an IPv6 address, it constructs and passes the IPv6 any address(::); otherwise (IPv4), it constructs and passes the IPv4 any address(0.0.0.0).
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‎libraries/AsyncUDP/src/AsyncUDP.cpp‎

Lines changed: 14 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -682,6 +682,8 @@ static esp_err_t joinMulticastGroup(const ip_addr_t *addr, bool join, tcpip_adap
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}
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boolAsyncUDP::listenMulticast(constip_addr_t *addr,uint16_t port,uint8_t ttl,tcpip_adapter_if_t tcpip_if) {
685+
ip_addr_t bind_addr;
686+
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if (!ip_addr_ismulticast(addr)) {
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returnfalse;
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}
@@ -690,7 +692,18 @@ bool AsyncUDP::listenMulticast(const ip_addr_t *addr, uint16_t port, uint8_t ttl
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returnfalse;
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}
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693-
if (!listen(NULL, port)) {
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#if CONFIG_LWIP_IPV6
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if (IP_IS_V6(addr)) {
697+
IP_SET_TYPE(&bind_addr, IPADDR_TYPE_V6);
698+
ip6_addr_set_any(&bind_addr.u_addr.ip6);
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}else {
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#endif
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IP_SET_TYPE(&bind_addr, IPADDR_TYPE_V4);
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ip4_addr_set_any(&bind_addr.u_addr.ip4);
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#if CONFIG_LWIP_IPV6
704+
}
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#endif
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if (!listen(&bind_addr, port)) {
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returnfalse;
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}
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