improved bus wait with raii class that updates last access

lib/RS485/busdelay.h

@@ -0,0 +1,37 @@
+#pragma once
+
+#define DEBUGLOG_DEFAULT_LOG_LEVEL_INFO
+
+#include <DebugLog.h>
+#include <Arduino.h>
+
+namespace drivers
+{
+
+    class BusDelay
+    {
+    public:
+        BusDelay(uint32_t &lastAccess, const uint32_t minDelay, const char *title) : m_lastAccess(lastAccess)
+        {
+            const uint32_t now = millis();
+            const uint32_t wait = now - lastAccess;
+            if (wait < minDelay)
+            {
+                LOG_WARN(title, "delay", wait);
+                delay(wait);
+            }
+        }
+
+        BusDelay(BusDelay &) = delete;
+        BusDelay operator=(BusDelay &) = delete;
+
+        ~BusDelay()
+        {
+            m_lastAccess = millis();
+        }
+
+    private:
+        uint32_t &m_lastAccess;
+    };
+
+}