Add DTLS 1.2 Mulicast Example.

[anhu]

This commit leaned heavily on Claude.

[JacobBarthelmeh]

Lots of build warnings:

bash-3.2$ make
gcc -o mcast-peer mcast-peer.c -Wall -Wextra  -Os -lwolfssl -lm -lpthread
mcast-peer.c:186:9: warning: unused variable 'ret' [-Wunused-variable]
    int ret;
        ^
mcast-peer.c:188:9: warning: unused variable 'txSd' [-Wunused-variable]
    int txSd = -1;
        ^
mcast-peer.c:189:9: warning: unused variable 'rxSd' [-Wunused-variable]
    int rxSd = -1;
        ^
mcast-peer.c:190:18: warning: unused variable 'ctx' [-Wunused-variable]
    WOLFSSL_CTX* ctx = NULL;
                 ^
mcast-peer.c:191:14: warning: unused variable 'sslTx' [-Wunused-variable]
    WOLFSSL* sslTx = NULL;
             ^
mcast-peer.c:192:14: warning: unused variable 'sslRx' [-Wunused-variable]
    WOLFSSL* sslRx = NULL;
             ^
mcast-peer.c:193:24: warning: unused variable 'txAddr' [-Wunused-variable]
    struct sockaddr_in txAddr;
                       ^
mcast-peer.c:194:9: warning: unused variable 'i' [-Wunused-variable]
    int i;
        ^
mcast-peer.c:197:19: warning: unused variable 'pms' [-Wunused-variable]
    unsigned char pms[PMS_SIZE];
                  ^
mcast-peer.c:198:19: warning: unused variable 'clientRandom' [-Wunused-variable]
    unsigned char clientRandom[RANDOM_SIZE];
                  ^
mcast-peer.c:199:19: warning: unused variable 'serverRandom' [-Wunused-variable]
    unsigned char serverRandom[RANDOM_SIZE];
                  ^
mcast-peer.c:201:19: warning: unused variable 'suite' [-Wunused-variable]
    unsigned char suite[2] = { 0x00, 0xFE };
                  ^
mcast-peer.c:203:12: warning: unused variable 'lastSend' [-Wunused-variable]
    time_t lastSend = 0;
           ^
mcast-peer.c:204:9: warning: unused variable 'msgCount' [-Wunused-variable]
    int msgCount = 0;
        ^
mcast-peer.c:76:12: warning: unused function 'setup_tx_socket' [-Wunused-function]
static int setup_tx_socket(struct sockaddr_in* txAddr)
           ^
mcast-peer.c:121:12: warning: unused function 'setup_rx_socket' [-Wunused-function]
static int setup_rx_socket(void)
           ^
16 warnings generated.

[JacobBarthelmeh]

This should be looking at /usr/local/include and usr/local/lib by default for wolfSSL headers and library. Making the attempt to use an installed wolfSSL library. Also use -lwolfssl to link against a dynamic library by default.

[Copilot]

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