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@@ -13,6 +13,50 @@ It uses modem CMUX mode so that commands and network could be used at the same t
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## About the esp_modem
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-Please check the component [README](managed_components/espressif__esp_modem/README.md)
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-
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-Or refer to the component's [documentation](managed_components/espressif__esp_modem/docs/html/index.html)
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+The esp_modem component is deployed automatically when building this example. It will be located inside this example directory, in relative path `managed_components/espressif__esp_modem`.
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+You can find a brief introduction in the root directory of the component, in the main `README.md` for or a full html documentation in the relative path `docs/html/index.html`.
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+
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+## How to use example
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+
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+### Hardware Required
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+
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+To run this example, you need an ESP32 dev board connected to a GSM/4G cellular module, which supports AT commands and PPP connectivity.
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+The example uses UART to communicate with the modem and it uses the below pin assignment:
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+
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+| ESP32 | Cellular Modem |
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+| ------ | -------------- |
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+| GPIO25 | RX |
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+| GPIO26 | TX |
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+| GND | GND |
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+
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+### Configure the project
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+
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+* Choose the modem module in `Choose supported modem device(DCE)` option.
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+* Set the access point name in `Set Access Point Name(APN)` option, which should depend on the operator of your SIM card.
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+* Enable `EXAMPLE_NEED_SIM_PIN`: To unlock the SIM card with a PIN code if needed
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+
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+## Example Output
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+
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+The example will unlock the SIM card (if enabled) and enter the CMUX mode.
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+Then it would initiate the connection to a public MQTT broker and at the same time reading some data using AT commands.
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+
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+```
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+I (571) uart: queue free spaces: 30
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+I (1731) cmux_example: Modem has correctly entered multiplexed command/data mode
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+I (2241) cmux_example: Operator name: "OperatorName"
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+I (7781) esp-netif_lwip-ppp: Connected
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+I (7781) esp-netif_lwip-ppp: Name Server1: xxx.xxx.xxx.xxx
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+I (7781) esp-netif_lwip-ppp: Name Server2: xxx.xxx.xxx.xxx
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+I (7781) cmux_example: Got IP address
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+I (7791) cmux_example: IP : xxx.xxx.xxx.xxx
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+I (7791) cmux_example: Netmask : xxx.xxx.xxx.xxx
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+I (7801) cmux_example: Gateway : xxx.xxx.xxx.xxx
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+I (7801) system_api: Base MAC address is not set
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+I (7811) system_api: read default base MAC address from EFUSE
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+I (9061) cmux_example: TOPIC: /topic/esp-modem
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+I (9061) cmux_example: DATA: Hello modem
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+I (9061) cmux_example: Data received
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+I (9211) cmux_example: Modem IMSI number: xxxxxxxxxxxxxxxx
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+I (21221) esp-netif_lwip-ppp: User interrupt
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+I (21221) esp_modem_netif: PPP state changed event 5
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+```
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David Cermak