Adds app/diagnostics application from #1424

user/tests/app/diagnostics/diagnostics.cpp

@@ -0,0 +1,38 @@
+#include "application.h"
+
+SYSTEM_THREAD(ENABLED);
+
+namespace {
+
+const Serial1LogHandler logHandler(115200, LOG_LEVEL_WARN, {
+    { "app", LOG_LEVEL_ALL }
+});
+
+const SerialLogHandler logHandler1(LOG_LEVEL_WARN, {
+    { "app", LOG_LEVEL_ALL }
+});
+
+
+unsigned logMillis = 0;
+unsigned logCount = 0;
+
+bool logDiagnosticData(void* appender, const uint8_t* data, size_t size) {
+    Log.write(LOG_LEVEL_INFO, (const char*)data, size);
+    return true;
+}
+
+} // namespace
+
+void setup() {
+    logMillis = millis();
+}
+
+void loop() {
+    if (millis() - logMillis >= 5000) {
+        ++logCount;
+        Log.printf(LOG_LEVEL_INFO, "%u: ", logCount);
+        system_format_diag_data(nullptr, 0, 0, logDiagnosticData, nullptr, nullptr);
+        Log.print(LOG_LEVEL_INFO, "\r\n");
+        logMillis = millis();
+    }
+}