Merge remote-tracking branch 'review/observer-firmware' into keymindCascade

# Conflicts:
#	.github/workflows/build-observer-firmwares.yml
#	.gitignore
#	MQTT_IMPLEMENTATION.md
#	MQTT_INTERNALS.md
#	README.md
#	STABILITY_TESTABILITY_HANDOFF.md
#	docs/cli_commands.md
#	examples/companion_radio/MyMesh.cpp
#	examples/simple_repeater/MyMesh.cpp
#	examples/simple_repeater/UITask.cpp
#	examples/simple_room_server/MyMesh.cpp
#	examples/simple_room_server/UITask.cpp
#	examples/simple_sensor/SensorMesh.cpp
#	platformio.ini
#	scripts/generate_webconfig_html.py
#	scripts/webconfig_mock_server.py
#	src/helpers/CommonCLI.cpp
#	src/helpers/CommonCLI.h
#	src/helpers/JWTHelper.cpp
#	src/helpers/MQTTDefaults.h
#	src/helpers/MQTTMessageBuilder.cpp
#	src/helpers/MQTTPayloadBuilder.h
#	src/helpers/MQTTPresets.h
#	src/helpers/bridges/MQTTBridge.h
#	src/helpers/esp32/WebConfigServer.cpp
#	src/helpers/esp32/WebConfigServer.h
#	src/helpers/ui/SH1106Display.cpp
#	variants/lilygo_tbeam_SX1262/platformio.ini
#	variants/lilygo_tbeam_SX1276/platformio.ini
#	variants/lilygo_tlora_v2_1/platformio.ini
#	variants/thinknode_m7/platformio.ini
#	webui/index.html

examples/simple_room_server/main.cpp

@@ -16,6 +16,7 @@
 #ifdef DISPLAY_CLASS
   #include "UITask.h"
   static UITask ui_task(display);
+  static bool display_ready = false;
 #endif
 
 StdRNG fast_rng;
@@ -45,7 +46,8 @@ void setup() {
 #endif
 
 #ifdef DISPLAY_CLASS
-  if (display.begin()) {
+  display_ready = display.begin();
+  if (display_ready) {
     display.startFrame();
     display.setCursor(0, 0);
     display.print("Please wait...");
@@ -113,7 +115,9 @@ void setup() {
   the_mesh.begin(fs);
 
 #ifdef DISPLAY_CLASS
-  ui_task.begin(the_mesh.getNodePrefs(), FIRMWARE_BUILD_DATE, FIRMWARE_VERSION);
+  if (display_ready) {
+    ui_task.begin(the_mesh.getNodePrefs(), FIRMWARE_BUILD_DATE, FIRMWARE_VERSION);
+  }
 #endif
 
 #ifdef ETHERNET_ENABLED
@@ -179,7 +183,7 @@ void loop() {
   the_mesh.loop();
   sensors.loop();
 #ifdef DISPLAY_CLASS
-  ui_task.loop();
+  if (display_ready) ui_task.loop();
 #endif
   rtc_clock.tick();
 #ifdef HAS_EXTERNAL_WATCHDOG