.. zephyr:code-sample:: cellular-modem
:name: Cellular modem
Use a cellular modem to communicate with a UDP server.
Overview
********
This sample consists of a simple application which powers on
the modem, brings up the net interface, then sends a packet
with pseudo random data to the endpoint test-endpoint.com,
which is a publicly hosted server which runs the Python
script found in the server folder. DNS is used to look
up the IP of test-endpoint.com.
Notes
*****
This sample uses the devicetree alias ``modem`` to identify
the modem instance to use. The sample also presumes that
the modem driver creates the only PPP network interface.
Setup
*****
Start by setting up the devicetree with the required
devicetree node:
.. code-block:: devicetree
/dts-v1/;
/ {
aliases {
modem = &modem;
};
};
&usart2 {
pinctrl-0 = <&usart2_tx_pa2 &usart2_rx_pa3 &usart2_rts_pa1 &usart2_cts_pa0>;
pinctrl-names = "default";
current-speed = <115200>;
hw-flow-control;
status = "okay";
modem: modem {
compatible = "quectel,bg9x";
mdm-power-gpios = <&gpioe 2 GPIO_ACTIVE_HIGH>;
mdm-reset-gpios = <&gpioe 3 GPIO_ACTIVE_HIGH>;
status = "okay";
};
};
Next, the UART API must be specified using ``CONFIG_UART_INTERRUPT_DRIVEN=y`` or
``CONFIG_UART_ASYNC_API=y``. The driver doesn't support UART polling.
Lastly, the APN must be configured using ``CONFIG_MODEM_CELLULAR_APN=""``.
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