device reset after failed DHCP request to recognize dead ethernet module

MqttClient.cpp

@@ -15,6 +15,7 @@
 #include <Print.h>
 #include "cmd.h"
 #include "config.h"
+#include "reset.h"
 
 
 char MQTT_BROKER_DEFAULT[] = "192.168.75.1";
@@ -145,7 +146,7 @@ String MqttConfig::exec(String params) {
   } else if (params.equalsIgnoreCase("reset")) {
     configReset();
     *out << "Stopping gateway, wait for reset" << endl;
-    while (true);
+    resetDevice();
     res = "done";
   }
   return res;

NetMeterBusMaster2.cpp

@@ -15,6 +15,7 @@
 #include <Metro.h>
 #include "config.h"
 #include "info.h"
+#include "reset.h"
 
 
 const uint8_t POWER_LED = 4;
@@ -36,21 +37,6 @@ static OverCurrentProt overCurrentProt;
 Metro wdogTick = Metro(1000);
 Metro dhcpTick = Metro(60 * 1000);
 
-extern "C" {
-  void startup_early_hook( ) __attribute__ ((weak));
-  void startup_early_hook() {
-    // enable watchdog
-    WDOG_UNLOCK = WDOG_UNLOCK_SEQ1;
-    WDOG_UNLOCK = WDOG_UNLOCK_SEQ2;
-
-    // one minute
-    WDOG_TOVALL = 0xea60;
-    WDOG_TOVALH = 0;
-    WDOG_PRESC =  0;
-
-    WDOG_STCTRLH = WDOG_STCTRLH_WDOGEN | WDOG_STCTRLH_ALLOWUPDATE | WDOG_STCTRLH_STOPEN | WDOG_STCTRLH_WAITEN;
-  }
-} // extern "C"
 
 void setup() {
   pinMode(POWER_LED, OUTPUT);
@@ -87,27 +73,14 @@ void setup() {
 }
 
 void loop() {
-  static uint16_t maxTmroutl = 0;
-
-  // watchdog refresh
-  cli();
-  WDOG_REFRESH = 0xa602;
-  WDOG_REFRESH = 0xb480;
-  sei();
-
-
-  if (wdogTick.check() == 1) {
-    uint16_t h = WDOG_TMROUTH;
-    uint16_t l = WDOG_TMROUTL;
-    maxTmroutl = (maxTmroutl > l) ? maxTmroutl : l;
-    uint16_t c = WDOG_RSTCNT;
-
-    Serial << "WDog, h: " << _HEX(h) << ", l: " << _HEX(l) << ", c: " << _HEX(c) << ", m: " << _HEX(maxTmroutl) << endl;
-  }
+  watchdogReset();
 
   if (dhcpTick.check() == 1) {
     byte r = Ethernet.maintain();
     Serial << "Ethernet.maintain: " << r << endl;
+    if ((r == DHCP_CHECK_REBIND_FAIL) || (r == DHCP_CHECK_RENEW_FAIL)) {
+      resetDevice();
+    }
   }
 
   //Serial << "*** 1" << endl;

reset.cpp

@@ -0,0 +1,61 @@
+/*
+ * reset.cpp
+ *
+ *  Created on: 14.05.2015
+ *      Author: wn
+ */
+
+#include <Streaming.h>
+
+const uint8_t POWER_LED = 4;
+
+
+void resetDevice() {
+  while (true) {
+    digitalWrite(POWER_LED, LOW);
+    delay(100);
+    digitalWrite(POWER_LED, HIGH);
+    delay(100);
+  }
+}
+
+
+
+void watchdogReset() {
+  static uint32_t last = 0;
+  static uint16_t maxTmroutl = 0;
+
+  // watchdog refresh
+  cli();
+  WDOG_REFRESH = 0xa602;
+  WDOG_REFRESH = 0xb480;
+  sei();
+
+  uint32_t now = millis();
+  if (last + 1000 < now) {
+    last = now;
+    uint16_t h = WDOG_TMROUTH;
+    uint16_t l = WDOG_TMROUTL;
+    maxTmroutl = (maxTmroutl > l) ? maxTmroutl : l;
+    uint16_t c = WDOG_RSTCNT;
+
+    Serial << "WDog, h: " << _HEX(h) << ", l: " << _HEX(l) << ", c: " << _HEX(c) << ", m: " << _HEX(maxTmroutl) << endl;
+  }
+}
+
+
+extern "C" {
+  void startup_early_hook( ) __attribute__ ((weak));
+  void startup_early_hook() {
+    // enable watchdog
+    WDOG_UNLOCK = WDOG_UNLOCK_SEQ1;
+    WDOG_UNLOCK = WDOG_UNLOCK_SEQ2;
+
+    // one minute
+    WDOG_TOVALL = 0xea60;
+    WDOG_TOVALH = 0;
+    WDOG_PRESC =  0;
+
+    WDOG_STCTRLH = WDOG_STCTRLH_WDOGEN | WDOG_STCTRLH_ALLOWUPDATE | WDOG_STCTRLH_STOPEN | WDOG_STCTRLH_WAITEN;
+  }
+} // extern "C"

reset.h

@@ -0,0 +1,17 @@
+/*
+ * reset.h
+ *
+ *  Created on: 14.05.2015
+ *      Author: wn
+ */
+
+#ifndef RESET_H_
+#define RESET_H_
+
+
+void resetDevice();
+void watchdogReset();
+
+
+
+#endif /* RESET_H_ */