Merge pull request #1598 from gpummer/issue-1588

Fixes #1588

These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).

SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later

Author: bettio

src/platforms/rp2/src/lib/lwipopts.h

@@ -119,4 +119,11 @@ void netif_poll(struct netif *netif);
 typedef void (*tcpip_callback_fn)(void *ctx);
 int tcpip_try_callback(tcpip_callback_fn function, void *ctx);
 
+// See https://github.com/atomvm/AtomVM/issues/1588
+// if we have UDP we assume we also have SNTP; lwip needs one more timer,
+// but doesn't account for it
+#if LWIP_UDP > 0
+#define MEMP_NUM_SYS_TIMEOUT (LWIP_NUM_SYS_TIMEOUT_INTERNAL + 1)
+#endif
+
 #endif /* __LWIPOPTS_H__ */