Limit the max number of nodes supported in RFM69 module

code/espurna/config/general.h

@@ -1352,6 +1352,10 @@
 #define RFM69_MAX_TOPICS            50
 #endif
 
+#ifndef RFM69_MAX_NODES
+#define RFM69_MAX_NODES             255
+#endif
+
 #ifndef RFM69_DEFAULT_TOPIC
 #define RFM69_DEFAULT_TOPIC         "/rfm69gw/{node}/{key}"
 #endif

code/espurna/rfm69.ino

@@ -25,7 +25,7 @@ struct _node_t {
     unsigned char lastPacketID = 0;
 };
 
-_node_t _rfm69_node_info[255];
+_node_t _rfm69_node_info[RFM69_MAX_NODES];
 unsigned char _rfm69_node_count;
 unsigned long _rfm69_packet_count;
 
@@ -115,6 +115,9 @@ void _rfm69Debug(const char * level, packet_t * data) {
 
 void _rfm69Process(packet_t * data) {
 
+    // Is node beyond RFM69_MAX_NODES?
+    if (data->senderID >= RFM69_MAX_NODES) return;
+
     // Count seen nodes and packets
     if (_rfm69_node_info[data->senderID].count == 0) ++_rfm69_node_count;
     ++_rfm69_packet_count;
@@ -235,10 +238,10 @@ void _rfm69Loop() {
 }
 
 void _rfm69Clear() {
-    for(unsigned int i=0; i<(sizeof(_rfm69_node_info) / sizeof(_node_t)); i++) {
+    for(unsigned int i=0; i<RFM69_MAX_NODES; i++) {
         _rfm69_node_info[i].duplicates = 0;
         _rfm69_node_info[i].missing = 0;
-        _rfm69_node_info [i].count = 0;
+        _rfm69_node_info[i].count = 0;
     }
     _rfm69_node_count = 0;
     _rfm69_packet_count = 0;