Update MQTT implementation for T-Beam 1W observers and partition handling

Added support for `LilyGo_TBeam_1W_repeater_observer_mqtt` and `LilyGo_TBeam_1W_room_server_observer_mqtt` in the MQTT implementation documentation. Updated partition table references to `default_16MB.csv` for these observers, clarifying the requirements for flashing firmware and the implications for stored settings. Enhanced the platformio configuration for both observer types, including build flags and dependencies.

MQTT_IMPLEMENTATION.md

@@ -172,13 +172,15 @@ Some MQTT observer builds use a non-default partition table to accommodate the l
 | `LilyGo_TLora_V2_1_1_6_room_server_observer_mqtt` | `min_spiffs.csv` | 4 MB | 1.875 MB | same |
 | `Station_G2_repeater_observer_mqtt` | `default_16MB.csv` | 16 MB | 6.25 MB | 16 MB flash board |
 | `Station_G2_room_server_observer_mqtt` | `default_16MB.csv` | 16 MB | 6.25 MB | 16 MB flash board |
+| `LilyGo_TBeam_1W_repeater_observer_mqtt` | `default_16MB.csv` | 16 MB | 6.25 MB | Set in `boards/t_beam_1w.json`; required vs implicit `default.csv` |
+| `LilyGo_TBeam_1W_room_server_observer_mqtt` | `default_16MB.csv` | 16 MB | 6.25 MB | same |
 
 **NVS / settings when the partition layout changes**
 
 Flashing a **full merged image** (`*-merged.bin` at offset `0x0`) writes a new bootloader **and** partition table. If that layout **differs** from what is already on the device, **NVS is typically wiped or invalidated** — expect to lose stored configuration (admin preferences, WiFi, MQTT slots, name, etc.) and reconfigure from scratch.
 
 - **`LilyGo_TLora_V2_1_1_6_*_observer_mqtt`:** These use the **same** `min_spiffs.csv` layout as other MeshCore TLora builds, so moving between repeater / room server / MQTT observer does **not** require a different partition table for normal upgrades. **If you previously installed an older TLora MQTT observer that used `huge_app.csv`,** flashing this firmware switches back to `min_spiffs` — treat that as a **partition layout change** (merged flash; NVS may be reset). **If you install MeshCore on a device that used a non-MeshCore partition map,** the first merged flash can still **wipe** settings.
-- **`Station_G2_*_observer_mqtt`:** These use `default_16MB.csv`. The same applies if you move **from** firmware that was built with a **different** partition table — the first merged flash that installs this layout can **wipe** stored settings.
+- **`Station_G2_*_observer_mqtt`** and **`LilyGo_TBeam_1W_*_observer_mqtt`**: These use `default_16MB.csv` to accomodate the larger size of the MQTT observer firmware. Installing MQTT observer firmware on these devices requires a **merged** flash the first time. The same applies if you move **from** firmware that was built with a **different** partition table—the first merged flash that installs this layout will **wipe** stored settings. 
 
 **How to flash the merged firmware:**
 

boards/t_beam_1w.json

@@ -2,6 +2,7 @@
     "build": {
         "arduino": {
             "ldscript": "esp32s3_out.ld",
+            "partitions": "default_16MB.csv",
             "memory_type": "qio_opi"
         },
         "core": "esp32",

variants/lilygo_tbeam_1w/platformio.ini

@@ -193,6 +193,92 @@ lib_deps =
   ${LilyGo_TBeam_1W.lib_deps}
   ${esp32_ota.lib_deps}
 
+; === LILYGO T-Beam 1W Repeater MQTT Observer ===
+[env:LilyGo_TBeam_1W_repeater_observer_mqtt]
+extends = LilyGo_TBeam_1W
+extra_scripts =
+  ${esp32_base.extra_scripts}
+  pre:scripts/generate_cert_bundle.py
+board_ssl_cert_source = adafruit-full
+board_build.embed_files = src/certs/x509_crt_bundle.bin
+build_flags =
+  ${LilyGo_TBeam_1W.build_flags}
+  -D ADVERT_NAME='"T-Beam 1W MQTT Observer"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"password"'
+  -D MAX_NEIGHBOURS=50
+  -D WITH_MQTT_BRIDGE=1
+  -D MAX_MQTT_BROKERS=3
+  -D MQTT_MAX_PACKET_SIZE=1024
+  -D PERSISTANT_GPS=1
+  -D ENV_SKIP_GPS_DETECT=1
+;  -D MQTT_DEBUG=1
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+  -D CONFIG_MBEDTLS_CERTIFICATE_BUNDLE=y
+  -D ESP32_CPU_FREQ=160
+#  -D WIFI_SSID='"ssid"'
+#  -D WIFI_PWD='"password"'
+#  -D MQTT_SERVER='"your-mqtt-broker.com"'
+#  -D MQTT_PORT=1883
+#  -D MQTT_USERNAME='"your-username"'
+#  -D MQTT_PASSWORD='"your-password"'
+build_src_filter = ${LilyGo_TBeam_1W.build_src_filter}
+  +<helpers/bridges/MQTTBridge.cpp>
+  +<helpers/MQTTMessageBuilder.cpp>
+  +<helpers/JWTHelper.cpp>
+  +<helpers/ui/SH1106Display.cpp>
+  +<../examples/simple_repeater>
+lib_deps =
+  ${LilyGo_TBeam_1W.lib_deps}
+  ${esp32_ota.lib_deps}
+  elims/PsychicMqttClient@^0.2.4
+  bblanchon/ArduinoJson
+  arduino-libraries/NTPClient
+  JChristensen/Timezone
+  paulstoffregen/Time@1.6.1
+
+; === LILYGO T-Beam 1W Room Server MQTT Observer ===
+[env:LilyGo_TBeam_1W_room_server_observer_mqtt]
+extends = LilyGo_TBeam_1W
+extra_scripts =
+  ${esp32_base.extra_scripts}
+  pre:scripts/generate_cert_bundle.py
+board_ssl_cert_source = adafruit-full
+board_build.embed_files = src/certs/x509_crt_bundle.bin
+build_flags =
+  ${LilyGo_TBeam_1W.build_flags}
+  -D ADVERT_NAME='"T-Beam 1W Room Observer"'
+  -D ADVERT_LAT=0.0
+  -D ADVERT_LON=0.0
+  -D ADMIN_PASSWORD='"password"'
+  -D ROOM_PASSWORD='"hello"'
+  -D WITH_MQTT_BRIDGE=1
+  -D MAX_MQTT_BROKERS=3
+  -D MQTT_MAX_PACKET_SIZE=1024
+  -D PERSISTANT_GPS=1
+  -D ENV_SKIP_GPS_DETECT=1
+  -D MQTT_DEBUG=1
+;  -D MESH_PACKET_LOGGING=1
+;  -D MESH_DEBUG=1
+  -D CONFIG_MBEDTLS_CERTIFICATE_BUNDLE=y
+  -D ESP32_CPU_FREQ=160
+build_src_filter = ${LilyGo_TBeam_1W.build_src_filter}
+  +<helpers/bridges/MQTTBridge.cpp>
+  +<helpers/MQTTMessageBuilder.cpp>
+  +<helpers/JWTHelper.cpp>
+  +<helpers/ui/SH1106Display.cpp>
+  +<../examples/simple_room_server>
+lib_deps =
+  ${LilyGo_TBeam_1W.lib_deps}
+  ${esp32_ota.lib_deps}
+  elims/PsychicMqttClient@^0.2.4
+  bblanchon/ArduinoJson
+  arduino-libraries/NTPClient
+  JChristensen/Timezone
+  paulstoffregen/Time@1.6.1
+
 [env:LilyGo_TBeam_1W_kiss_modem]
 extends = LilyGo_TBeam_1W
 build_src_filter = ${LilyGo_TBeam_1W.build_src_filter}