fix(modem): Add CMUX example to target tests

.github/workflows/modem__target-test.yml

@@ -15,7 +15,7 @@ jobs:
       matrix:
         idf_ver: ["latest"]
         idf_target: ["esp32c3"]
-        test: [ { app: pppd, path: test/target }, { app: sim800_c3, path: examples/pppos_client } ]
+        test: [ { app: pppd, path: test/target }, { app: sim800_c3, path: examples/pppos_client }, { app: sim800_cmux, path: examples/simple_cmux_client } ]
     runs-on: ubuntu-20.04
     container: espressif/idf:${{ matrix.idf_ver }}
     env:
@@ -54,7 +54,7 @@ jobs:
       matrix:
         idf_ver: ["latest"]
         idf_target: ["esp32c3"]
-        test: [ { app: pppd, path: test/target }, { app: sim800_c3, path: examples/pppos_client } ]
+        test: [ { app: pppd, path: test/target }, { app: sim800_c3, path: examples/pppos_client }, { app: sim800_cmux, path: examples/simple_cmux_client } ]
     needs: build_esp_modem_tests
     runs-on:
       - self-hosted

README.md

@@ -3,7 +3,7 @@
 ## How to use
 
 The [ESP-Protocols](https://github.com/espressif/esp-protocols) repository contains a collection of protocol components for [ESP-IDF](https://github.com/espressif/esp-idf).
-Additionally, each component is available in [IDF Component Registry](https://components.espressif.com). 
+Additionally, each component is available in [IDF Component Registry](https://components.espressif.com).
 Please refer to instructions in [ESP-IDF](https://github.com/espressif/esp-idf)
 
 ## Components

components/esp_modem/examples/simple_cmux_client/pytest_cmux.py

@@ -0,0 +1,17 @@
+# SPDX-FileCopyrightText: 2023 Espressif Systems (Shanghai) CO LTD
+# SPDX-License-Identifier: Unlicense OR CC0-1.0
+from __future__ import print_function, unicode_literals
+
+
+def test_cmux_connection(dut):
+    """
+    steps:
+      1. initializes connection with SIM800
+      2. checks we get an IP
+      3. checks for the MQTT events
+    """
+    # Check the sequence of connecting, publishing, disconnecting
+    dut.expect('Modem has correctly entered multiplexed')
+    # Check for MQTT connection and the data event
+    dut.expect('TOPIC: /topic/esp-modem')
+    dut.expect('DATA: Hello modem')

components/esp_modem/examples/simple_cmux_client/sdkconfig.ci.sim800_cmux

@@ -0,0 +1,17 @@
+CONFIG_IDF_TARGET="esp32c3"
+# Override some defaults to enable PPP
+CONFIG_LWIP_PPP_SUPPORT=y
+CONFIG_LWIP_PPP_NOTIFY_PHASE_SUPPORT=y
+CONFIG_LWIP_PPP_PAP_SUPPORT=y
+CONFIG_LWIP_TCPIP_TASK_STACK_SIZE=4096
+CONFIG_LWIP_PPP_ENABLE_IPV6=n
+CONFIG_EXAMPLE_MODEM_UART_TX_PIN=4
+CONFIG_EXAMPLE_MODEM_UART_RX_PIN=5
+CONFIG_EXAMPLE_MODEM_DEVICE_SIM800=y
+CONFIG_EXAMPLE_MODEM_DEVICE_BG96=n
+CONFIG_EXAMPLE_MODEM_PPP_APN="lpwa.vodafone.com"
+CONFIG_ESP_SYSTEM_PANIC_PRINT_HALT=y
+CONFIG_ESP32_PANIC_PRINT_HALT=y
+CONFIG_COMPILER_CXX_EXCEPTIONS=y
+CONFIG_ESP_MAIN_TASK_STACK_SIZE=8192
+CONFIG_EXAMPLE_CLOSE_CMUX_AT_END=y