From 60d5d95175d0b39bdd0640f39c9ae0e9f711c0cb Mon Sep 17 00:00:00 2001
From: destroyedlolo <l_faillie@yahoo.com>
Date: Wed, 28 Mar 2018 00:45:17 +0200
Subject: [PATCH] Really handle early requests and secure command waiting

---
 examples/DS18B20_DHT22/DS18B20_DHT22.ino | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/examples/DS18B20_DHT22/DS18B20_DHT22.ino b/examples/DS18B20_DHT22/DS18B20_DHT22.ino
index 2d88af7..d9e894d 100644
--- a/examples/DS18B20_DHT22/DS18B20_DHT22.ino
+++ b/examples/DS18B20_DHT22/DS18B20_DHT22.ino
@@ -42,11 +42,13 @@ enum DeviceState {
 
 volatile DeviceState state = DeviceState::WAIT4RESET;
 volatile unsigned long conversionStartTime = 0;
+volatile int ignByte = 0;	// Bytes to be ignored
 
 void owRcv( OneWireSlave::ReceiveEvent evt, byte cmd ){
 	switch( evt ){
 	case OneWireSlave::RE_Reset:
 		state = DeviceState::WAIT4COMMAND;
+		ignByte = 0;
 #ifdef DEBUG
 		Serial.println(F("Reset"));
 #endif
@@ -58,10 +60,10 @@ void owRcv( OneWireSlave::ReceiveEvent evt, byte cmd ){
 #endif
 		break;
 	case OneWireSlave::RE_Byte:
-		switch( cmd ){
+		if( state == DeviceState::WAIT4COMMAND ) switch( cmd ){
 		case OW_Cmd::START_CONVERSION:
 				// Do a new request only if enough time passed
-			if( !millis() || millis() < conversionStartTime || millis() > conversionStartTime + 2000 ){
+			if( !conversionStartTime || millis() < conversionStartTime || millis() > conversionStartTime + 2000 ){
 				state = DeviceState::CONVERTING;
 				OWSlave.beginWriteBit(0, true); // send zeros as long as the conversion is not finished
 			}