Bind the UDP receive port to the desired address (#302)

Binding to INADDR_ANY causes us to receive datagrams destined for our
port to any address, which can be problematic if, for example, there
are different LCM publishers using different multicast addresses and
the same port.

This reverts commit 6b9099a,
reapplying 7606629 but with a WIN32
guard now to retain the INADDR_ANY behavior on windows, as well as
newly applying the same fix to mpudpm.

Co-authored-by: Sam Creasey <sam.creasey@tri.global>

lcm/lcm_mpudpm.c

@@ -1387,7 +1387,13 @@ static mpudpm_socket_t *add_recv_socket(lcm_mpudpm_t *lcm, uint16_t port)
     struct sockaddr_in addr;
     memset(&addr, 0, sizeof(addr));
     addr.sin_family = AF_INET;
+#ifndef WIN32
+    addr.sin_addr = lcm->params.mc_addr;
+#else
+    // On WIN32 if we try to bind to mc_addr, we get WSAEADDRNOTAVAIL.
+    // See https://github.com/lcm-proj/lcm/issues/258.
     addr.sin_addr.s_addr = INADDR_ANY;
+#endif
     addr.sin_port = htons(port);
 
     // allow other applications on the local machine to also bind to this

lcm/lcm_udpm.c

@@ -895,7 +895,13 @@ static int _setup_recv_parts(lcm_udpm_t *lcm)
     struct sockaddr_in addr;
     memset(&addr, 0, sizeof(addr));
     addr.sin_family = AF_INET;
+#ifndef WIN32
+    addr.sin_addr = lcm->params.mc_addr;
+#else
+    // On WIN32 if we try to bind to mc_addr, we get WSAEADDRNOTAVAIL.
+    // See https://github.com/lcm-proj/lcm/issues/258.
     addr.sin_addr.s_addr = INADDR_ANY;
+#endif
     addr.sin_port = lcm->params.mc_port;
 
     // allow other applications on the local machine to also bind to this