dashboard: add api timing diagnostics

firmware/esp32-s3-dashboard/dashboard_config.h

@@ -1,6 +1,6 @@
 #pragma once
 
-static const char *DASHBOARD_VERSION = "0.0.9-status-fields";
+static const char *DASHBOARD_VERSION = "0.0.10-api-timing";
 
 // Update these if your Cargo ESP AP credentials are different.
 static const char *CARGO_WIFI_SSID = "OverlandController";

firmware/esp32-s3-dashboard/esp32-s3-dashboard.ino

@@ -468,13 +468,21 @@ static bool fetch_status_fields(const char *url, const char *label)
         return false;
     }
 
+    unsigned long start_ms = millis();
+
     Serial.print("GET ");
     Serial.println(url);
 
     HTTPClient http;
     http.setTimeout(5000);
+
+    unsigned long begin_start_ms = millis();
     http.begin(url);
+    unsigned long begin_ms = millis() - begin_start_ms;
+
+    unsigned long get_start_ms = millis();
     int code = http.GET();
+    unsigned long get_ms = millis() - get_start_ms;
 
     status_model.http_code = code;
 
@@ -483,17 +491,46 @@ static bool fetch_status_fields(const char *url, const char *label)
     Serial.println(code);
 
     if (code == 200) {
+        unsigned long body_start_ms = millis();
         String body = http.getString();
+        unsigned long body_ms = millis() - body_start_ms;
 
         Serial.print(label);
         Serial.print(" body length: ");
         Serial.println(body.length());
 
+        unsigned long parse_start_ms = millis();
         parse_status_json(body);
+        unsigned long parse_ms = millis() - parse_start_ms;
+
+        unsigned long total_ms = millis() - start_ms;
+
+        Serial.print("TIMING ");
+        Serial.print(label);
+        Serial.print(" begin=");
+        Serial.print(begin_ms);
+        Serial.print("ms get=");
+        Serial.print(get_ms);
+        Serial.print("ms body=");
+        Serial.print(body_ms);
+        Serial.print("ms parse+ui=");
+        Serial.print(parse_ms);
+        Serial.print("ms total=");
+        Serial.print(total_ms);
+        Serial.print("ms bytes=");
+        Serial.println(body.length());
+
         http.end();
         return true;
     }
 
+    unsigned long total_ms = millis() - start_ms;
+    Serial.print("TIMING ");
+    Serial.print(label);
+    Serial.print(" failed total=");
+    Serial.print(total_ms);
+    Serial.println("ms");
+
     status_model.api_ok = false;
 
     String system;