send user messages every 5 mins

TODO.md

@@ -53,6 +53,8 @@ until the phone pulls those packets.  Ever so often power on bluetooth just so w
 
 # Low priority
 
+* if radio params change fundamentally, discard the nodedb
+* discard very old nodedb records (> 1wk)
 * using the genpartitions based table doesn't work on TTGO so for now I stay with my old memory map
 * We let anyone scan for us (FIXME, perhaps only allow that until we are paired with a phone and configured) 
 * use two different env flags for ttgo vs lora32. https://docs.platformio.org/en/latest/ide/vscode.html#key-bindings

src/MeshService.cpp

@@ -156,7 +156,7 @@ void MeshService::loop()
     // FIXME, don't send user this often, but for now it is useful for testing
     static uint32_t lastsend;
     uint32_t now = millis();
-    if (now - lastsend > 20 * 1000)
+    if (now - lastsend > 5 * 60 * 1000)
     {
         lastsend = now;
         sendOurOwner();