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Add to your firmware section: This example contains all possible configuration options, not all of them are mandatory!
The following modules are automatically loaded (just as if you had added them in the airframe file)
<!DOCTYPE module SYSTEM "module.dtd">
<module name="telemetry_secure_common" dir="datalink" task="datalink">
<doc>
<description>
Telemetry using secure PPRZ protocol - common parts
</description>
<configure name="MODEM_PORT" value="UARTx" description="UART where the modem is connected to (UART1, UART2, etc)"/>
<configure name="MODEM_BAUD" value="B57600" description="UART baud rate"/>
</doc>
<autoload name="telemetry" type="nps_secure"/>
<autoload name="telemetry" type="sim"/>
<makefile target="!fbw|sim|nps|hitl">
<configure name="MODEM_PORT" case="upper|lower"/>
<define name="USE_$(MODEM_PORT_UPPER)"/>
<define name="$(MODEM_PORT_UPPER)_BAUD" value="$(MODEM_BAUD)"/>
<define name="DOWNLINK"/>
<define name="PERIODIC_TELEMETRY"/>
<define name="DOWNLINK_DEVICE" value="$(MODEM_PORT_LOWER)"/>
<define name="PPRZ_UART" value="$(MODEM_PORT_LOWER)"/>
</makefile>
<makefile target="!fbw|sim">
<define name="DOWNLINK"/>
<define name="PERIODIC_TELEMETRY"/>
<define name="DATALINK" value="PPRZ"/>
<file name="downlink.c" dir="subsystems/datalink"/>
<file name="datalink.c" dir="subsystems/datalink"/>
<file name="telemetry.c" dir="subsystems/datalink"/>
<file name="pprz_transport.c" dir="pprzlink/src"/>
</makefile>
<makefile target="ap" firmware="fixedwing">
<file name="fixedwing_datalink.c" dir="$(SRC_FIRMWARE)"/>
<file name="ap_downlink.c" dir="$(SRC_FIRMWARE)"/>
</makefile>
<makefile target="ap|fbw" firmware="fixedwing">
<file name="fbw_downlink.c" dir="$(SRC_FIRMWARE)"/>
</makefile>
<makefile target="ap" firmware="rotorcraft">
<file name="rotorcraft_datalink.c" dir="$(SRC_FIRMWARE)"/>
<file name="rotorcraft_telemetry.c" dir="$(SRC_FIRMWARE)"/>
</makefile>
</module>