From 1ea89da68524b27061bd86c8e7dcf3df0b367f71 Mon Sep 17 00:00:00 2001
From: Stephen Casner <casner@acm.org>
Date: Wed, 16 Jan 2019 17:29:54 -0800
Subject: [PATCH] Improved suppression of repeated log messages when WiFi is
 down

More precise implementation that checks for a change in the interface
name and in the DNS server addresses.
---
 vehicle/OVMS.V3/main/ovms_netmanager.cpp | 31 +++++++++++++++++-------
 vehicle/OVMS.V3/main/ovms_netmanager.h   |  3 ++-
 2 files changed, 24 insertions(+), 10 deletions(-)

diff --git a/vehicle/OVMS.V3/main/ovms_netmanager.cpp b/vehicle/OVMS.V3/main/ovms_netmanager.cpp
index 8ea7f5c0d..58b1ab91a 100644
--- a/vehicle/OVMS.V3/main/ovms_netmanager.cpp
+++ b/vehicle/OVMS.V3/main/ovms_netmanager.cpp
@@ -190,8 +190,9 @@ OvmsNetManager::OvmsNetManager()
     {
     m_dns_modem[i] = (ip_addr_t)ip_addr_any;
     m_dns_wifi[i] = (ip_addr_t)ip_addr_any;
+    m_previous_dns[i] = (ip_addr_t)ip_addr_any;
     }
-  m_previous_priority = NULL;
+  m_previous_name[0] = m_previous_name[1] = 0;
 
 #ifdef CONFIG_OVMS_SC_GPL_MONGOOSE
   m_mongoose_task = 0;
@@ -445,9 +446,13 @@ void OvmsNetManager::SetDNSServer(ip_addr_t* dnsstore)
         cserver = std::string(servers,sep,next-sep);
         sep = next+1;
         }
-      ESP_LOGI(TAG, "Set DNS#%d %s",spos,cserver.c_str());
       ip4_addr_set_u32(ip_2_ip4(&serverip), ipaddr_addr(cserver.c_str()));
       serverip.type = IPADDR_TYPE_V4;
+      if (!ip_addr_cmp(&serverip, &m_previous_dns[spos]))
+        {
+        m_previous_dns[spos] = serverip;
+        ESP_LOGI(TAG, "Set DNS#%d %s",spos,cserver.c_str());
+        }
       dns_setserver(spos++, &serverip);
       }
     for (;spos<DNS_MAX_SERVERS;spos++)
@@ -460,7 +465,11 @@ void OvmsNetManager::SetDNSServer(ip_addr_t* dnsstore)
     // Set stored DNS servers:
     for (int i=0; i<DNS_MAX_SERVERS; i++)
       {
-      ESP_LOGI(TAG, "Set DNS#%d %s", i, inet_ntoa(dnsstore[i]));
+      if (ip_addr_cmp(&dnsstore[i], &m_previous_dns[i]))
+        {
+        m_previous_dns[i] = dnsstore[i];
+        ESP_LOGI(TAG, "Set DNS#%d %s", i, inet_ntoa(dnsstore[i]));
+        }
       dns_setserver(i, &dnsstore[i]);
       }
     }
@@ -528,12 +537,16 @@ void OvmsNetManager::PrioritiseAndIndicate()
     if ((pri->name[0]==search[0])&&
         (pri->name[1]==search[1]))
       {
-      if (pri == m_previous_priority)
-        return;
-      m_previous_priority = pri;
-      ESP_LOGI(TAG, "Interface priority is %c%c%d (" IPSTR "/" IPSTR " gateway " IPSTR ")",
-        pri->name[0], pri->name[1], pri->num,
-        IP2STR(&pri->ip_addr.u_addr.ip4), IP2STR(&pri->netmask.u_addr.ip4), IP2STR(&pri->gw.u_addr.ip4));
+      if (search[0] != m_previous_name[0] || search[1] != m_previous_name[1])
+        {
+        ESP_LOGI(TAG, "Interface priority is %c%c%d (" IPSTR "/" IPSTR " gateway " IPSTR ")",
+          pri->name[0], pri->name[1], pri->num,
+          IP2STR(&pri->ip_addr.u_addr.ip4), IP2STR(&pri->netmask.u_addr.ip4), IP2STR(&pri->gw.u_addr.ip4));
+        m_previous_name[0] = search[0];
+        m_previous_name[1] = search[1];
+        for (int i=0; i<DNS_MAX_SERVERS; i++)
+          m_previous_dns[i] = (ip_addr_t)ip_addr_any;
+        }
       netif_set_default(pri);
       SetDNSServer(dns);
       return;
diff --git a/vehicle/OVMS.V3/main/ovms_netmanager.h b/vehicle/OVMS.V3/main/ovms_netmanager.h
index a66c6d397..34b756201 100644
--- a/vehicle/OVMS.V3/main/ovms_netmanager.h
+++ b/vehicle/OVMS.V3/main/ovms_netmanager.h
@@ -112,7 +112,8 @@ class OvmsNetManager
     bool m_network_any;
     ip_addr_t m_dns_wifi[DNS_MAX_SERVERS];
     ip_addr_t m_dns_modem[DNS_MAX_SERVERS];
-    struct netif* m_previous_priority;
+    ip_addr_t m_previous_dns[DNS_MAX_SERVERS];
+    char m_previous_name[2];
 
 #ifdef CONFIG_OVMS_SC_GPL_MONGOOSE
   protected: