Fix initialization of network config block (#140)

***ST_NUCLEO144_F439ZI***
***ST_NUCLEO144_F746ZG***

CMSIS-OS/ChibiOS/ST_NUCLEO144_F439ZI/common/targetHAL_ConfigurationManager.cpp

@@ -14,13 +14,16 @@ bool InitialiseNetworkDefaultConfig(HAL_Configuration_NetworkInterface * pconfig
 {
     (void)configurationIndex;
 
+    // zero memory
+    memset(pconfig, 0, sizeof(HAL_Configuration_NetworkInterface));
+
     // make sure the config block marker is set
     memcpy(pconfig->Marker, c_MARKER_CONFIGURATION_NETWORK_V1, sizeof(c_MARKER_CONFIGURATION_NETWORK_V1));
     
     pconfig->InterfaceType = NetworkInterfaceType_Ethernet;
     pconfig->StartupAddressMode = AddressMode_DHCP;
     pconfig->AutomaticDNS = 1;
-    pconfig->SpecificConfigId = 0;
+    pconfig->SpecificConfigId = UINT32_MAX;
 
     // set MAC address with ST provided MAC for development boards
     // 00:80:E1:01:35:D1

CMSIS-OS/ChibiOS/ST_NUCLEO144_F746ZG/common/targetHAL_ConfigurationManager.cpp

@@ -14,13 +14,16 @@ bool InitialiseNetworkDefaultConfig(HAL_Configuration_NetworkInterface * pconfig
 {
     (void)configurationIndex;
 
+    // zero memory
+    memset(pconfig, 0, sizeof(HAL_Configuration_NetworkInterface));
+
     // make sure the config block marker is set
     memcpy(pconfig->Marker, c_MARKER_CONFIGURATION_NETWORK_V1, sizeof(c_MARKER_CONFIGURATION_NETWORK_V1));
     
     pconfig->InterfaceType = NetworkInterfaceType_Ethernet;
     pconfig->StartupAddressMode = AddressMode_DHCP;
     pconfig->AutomaticDNS = 1;
-    pconfig->SpecificConfigId = 0;
+    pconfig->SpecificConfigId = UINT32_MAX;
 
     // set MAC address with ST provided MAC for development boards
     // 00:80:E1:01:35:D1