RPC: Improve setup instructions for ESP (#11473)

Multiple reports of people have incorrect uart setups and problems with
CHIP_SHELL interfering with RPC. Create better instructions for
ensuring the default configuration is correct.

examples/all-clusters-app/esp32/README.md

@@ -5,15 +5,16 @@ control.
 
 ---
 
--   [CHIP ESP32 All Clusters Example](#chip-esp32-all-clusters-example)
-    -   [Supported Devices](#supported-devices)
-    -   [Building the Example Application](#building-the-example-application)
-    -   [Commissioning and cluster control](#commissioning-and-cluster-control)
-        -   [Setting up Python Controller](#setting-up-python-controller)
-        -   [Commissioning over BLE](#commissioning-over-ble)
-        -   [Cluster control](#cluster-control)
-    -   [Flashing app using script](#flashing-app-using-script)
-    -   [Note](#note)
+- [CHIP ESP32 All Clusters Example](#chip-esp32-all-clusters-example)
+  - [Supported Devices](#supported-devices)
+  - [Building the Example Application](#building-the-example-application)
+  - [Commissioning and cluster control](#commissioning-and-cluster-control)
+    - [Setting up Python Controller](#setting-up-python-controller)
+    - [Commissioning over BLE](#commissioning-over-ble)
+    - [Cluster control](#cluster-control)
+    - [Flashing app using script](#flashing-app-using-script)
+    - [Note](#note)
+  - [Using the RPC console](#using-the-rpc-console)
 
 ---
 
@@ -260,13 +261,30 @@ actual effect of the commands.
 
 ## Using the RPC console
 
-Enable RPCs in the build using menuconfig:
+You can use the rpc default config to setup everything correctly for RPCs:
 
-    $ idf.py menuconfig
+    $ export SDKCONFIG_DEFAULTS=$PROJECT_ROOT/examples/all-clusters-app/esp32/sdkconfig_m5stack_rpc.defaults
+    $ rm sdkconfig
+    $ idf.py fullclean
 
-Enable the RPC library:
+Alternatively, Enable RPCs in the build using menuconfig:
 
-    Component config → CHIP Core → General Options → Enable Pigweed PRC library
+    - Enable the RPC library and Disable ENABLE_CHIP_SHELL
+
+        Component config → CHIP Core → General Options → Enable Pigweed PRC library
+        Component config → CHIP Core → General Options → Disabe CHIP Shell
+
+    - Ensure the UART is correctly configured for your board, for m5stack:
+
+        PW RPC Debug channel → UART port number → 0
+        PW RPC Debug channel → UART communication speed → 115200
+        PW RPC Debug channel → UART RXD pin number → 3
+        PW RPC Debug channel → UART TXD pin number → 1
+
+After configuring you can build and flash normally:
+
+    $ idf.py build
+    $ idf.py flash
 
 After flashing a build with RPCs enabled you can use the rpc console to send
 commands to the device.