-fix button unresponsive issue

-introduce subtle flashing for keepaliev detection

src/main.cpp

@@ -5,12 +5,13 @@
 // GPIOs
 #define GPIO_EMERGENCY_LED 5
 #define GPIO_SYNC_LED 19
+#define GPIO_REQUESTED_STATE_LED 2
 #define GPIO_EMERGENCY_BUTTON 16
 
 // Software Parameters
 #define LOOP_DELAY 1
 #define PING_TIMEOUT_NUM_LOOPS 2
-#define EMERGENCY_BUTTON_SCAN_RATE_SECONDS 2
+#define EMERGENCY_BUTTON_SCAN_RATE_SECONDS 1
 
 String macList[2] = {"24:6F:28:B1:EE:74", "24:6F:28:B2:40:8C"};
 String macLocal,macRemote;
@@ -64,6 +65,7 @@ void OnButtonPushed(){
   Serial.println("BUTTON PUSH CALLBACK.");
   if((getUptimeInSeconds()-lastButtonPushUptimeInSeconds)>EMERGENCY_BUTTON_SCAN_RATE_SECONDS){
     isSenderEmergency=!isSenderEmergency;
+    digitalWrite(GPIO_REQUESTED_STATE_LED,isSenderEmergency?HIGH:LOW);
     lastButtonPushUptimeInSeconds=getUptimeInSeconds();
     Serial.println("BUTTON PUSH EXEC.");
   }
@@ -141,6 +143,9 @@ void setup(){
   esp_now_register_recv_cb(OnDataRecv);
 
   pinMode(GPIO_EMERGENCY_LED, OUTPUT);
+  pinMode(GPIO_REQUESTED_STATE_LED, OUTPUT);
+
+  digitalWrite(GPIO_REQUESTED_STATE_LED,LOW);
   digitalWrite(GPIO_EMERGENCY_LED,LOW);
   pinMode(GPIO_SYNC_LED,OUTPUT);
   digitalWrite(GPIO_SYNC_LED,LOW);
@@ -159,11 +164,12 @@ void setup(){
 void loop(){
   // Send message via ESP-NOW
   sleep(LOOP_DELAY);
+
   boolean isButtonPushed = (HIGH== digitalRead(GPIO_EMERGENCY_BUTTON));
   Serial.println(isButtonPushed?"PUSHED":"RELEASED");
 
   // only one device has a button, the origin will tell the recipient to revert back the status.
-  if (isButtonPushed) {
+  if (isSenderEmergency) {
     myData.macOfSender=macLocal;
   }
 
@@ -178,12 +184,11 @@ void loop(){
   Serial.println(myData.isEmergency?"EMERGENGY ON":"EMERGENCY OFF");
   Serial.println((isSenderEmergency==1)?"SEN EMERG ON":"SEN EMERG OFF");
   
-
+  digitalWrite(GPIO_SYNC_LED,LOW);
   if ((getUptimeInSeconds()-lastPingUptimeInSeconds) < (LOOP_DELAY*PING_TIMEOUT_NUM_LOOPS)) {
+    delay(3);
     digitalWrite(GPIO_SYNC_LED,HIGH);
-  } else {
-    digitalWrite(GPIO_SYNC_LED,LOW);
-  }
+  } 
 
   switch (result) {
     case  ESP_OK: