Add atomic<bool> variable m_coinAttached to check for state change:

send signal runProc_coinAttached only if state changes from false true.

src/runProc.cpp

@@ -48,8 +48,12 @@ T_runProc::T_runProc()
 void T_runProc::runProc_slotProcess(void)
 {
 #ifndef THIS_IS_CA_MASTER
-    if (epi_getDI_CoinAttach()) {
-        emit runProc_coinAttached();
+    bool const coinAttached = epi_getDI_CoinAttach();
+    if (m_coinAttached.exchange(coinAttached) == false) {
+        if (coinAttached) {
+            // old value was false, and new value is true
+            emit runProc_coinAttached();
+        }
     }
     cash_paymentProcessing();
     doors_supervise();