From eb5ca48a86e961f4eea03ceb34abfc5416d6d908 Mon Sep 17 00:00:00 2001
From: Joerg Lehmann <joerg.lehmann@nbit.ch>
Date: Thu, 3 Oct 2019 20:55:51 +0200
Subject: [PATCH] only accept downlink message to tare within certain time

---
 mini-beieli-node.ino | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/mini-beieli-node.ino b/mini-beieli-node.ino
index 0612222..a00957a 100644
--- a/mini-beieli-node.ino
+++ b/mini-beieli-node.ino
@@ -188,6 +188,7 @@ typedef struct {
 
 byte my_position = 0;    // what is our actual measurement, starts with 0
 long timer_pos0;
+long timer_boot;        // timer when node booted
 
 // Global Variables
 LORA_data lora_data;
@@ -240,6 +241,7 @@ void sensorJob_cb(osjob_t* pJob);
 
 void setup(void)
 {
+  timer_boot = millis();
   gCatena.begin();
   ClearLoraData();
 
@@ -934,6 +936,14 @@ static void receiveMessage(void *pContext, uint8_t port, const uint8_t *pMessage
     gCatena.SafePrintf("\n");
   }
 
+  if ((millis() - timer_boot) > 120000) { 
+    if (config_data.debug_level > 0) {
+      gCatena.SafePrintf("tare with downlink is only possible within 2 minutes after boot!\n");
+      return;
+    }
+    
+  }
+
   if (port == 1 && nMessage == 1) {
     if (pMessage[0] == 0) {
       if (config_data.debug_level > 0) {