fix(libraries/asyncudp): IPv4 ONLY listenMulticast()

[nikiwaibel]

Description of Change

AsyncUDP::listenMulticast() properly receives packets sent to IPv4 multicast addresses like 239.1.2.3, but it is not receiving packets sent to IPv6 multicast addresses like ff12::6ood:cafe.

The root cause is a bit hidden: listen(NULL, port) would match AsyncUDP::listen(const ip_addr_t *addr, uint16_t port), which calls _udp_bind(_pcb, addr, port), which uses the lwIP API to call udp_bind(struct udp_pcb *pcb, const ip_addr_t *ipaddr, u16_t port) at the end. If lwIP has LWIP_IPV4 enabled, it checks if ipaddr == NULL and sets it to IP4_ADDR_ANY. So an IPv6 address is never bound.

This fix checks the IP address passed to AsyncUDP::listenMulticast(). If it 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).

Tests scenarios

I've tested my Pull Request on Arduino-esp32 core v3.2.0 with a Heltec v3 (ESP32-S3) board.

Related links

Fixes#9970 (it was auto-closed).
In PR #11443 i've used a branch name with uppercase letters, which produced some warnings.

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Test Results

76 files 76 suites 12m 44s ⏱️
38 tests 38 ✅ 0 💤 0 ❌
241 runs 241 ✅ 0 💤 0 ❌

Results for commit 57f2ba7.

[github-actions]

Memory usage test (comparing PR against master branch)

The table below shows the summary of memory usage change (decrease - increase) in bytes and percentage for each target.

Memory	FLASH [bytes]		FLASH [%]		RAM [bytes]		RAM [%]
Target	DEC	INC	DEC	INC	DEC	INC	DEC	INC
ESP32P4	0	⚠️ +34	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32S3	0	⚠️ +36	0.00	0.00	0	0	0.00	0.00
ESP32S2	0	⚠️ +44	0.00	⚠️ +0.01	0	0	0.00	0.00
ESP32C3	0	⚠️ +34	0.00	0.00	0	0	0.00	0.00
ESP32C6	0	⚠️ +34	0.00	0.00	0	0	0.00	0.00
ESP32	0	⚠️ +48	0.00	⚠️ +0.01	0	0	0.00	0.00

Click to expand the detailed deltas report [usage change in BYTES]

Target	ESP32P4		ESP32S3		ESP32S2		ESP32C3		ESP32C6		ESP32
Example	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM	FLASH	RAM
libraries/AsyncUDP/examples/AsyncUDPClient	0	0	0	0	0	0	0	0	0	0	0	0
libraries/AsyncUDP/examples/AsyncUDPMulticastServer	⚠️ +34	0	⚠️ +36	0	⚠️ +44	0	⚠️ +34	0	⚠️ +34	0	⚠️ +48	0
libraries/AsyncUDP/examples/AsyncUDPServer	0	0	0	0	0	0	0	0	0	0	0	0