nuttx-apps/include/system/microros_transport.h
Arjav Patel 5e91459b1a system/microros: Add UDP and serial custom transport backends.
Micro XRCE-DDS expects the application to supply open/close/write/read
callbacks for the wire transport. Add a single dispatcher that
registers the selected backend via rmw_uros_set_custom_transport(),
plus two backends:

transport/microros_transport_udp.c
  BSD-socket UDP backend. Opens an AF_INET/SOCK_DGRAM socket,
  resolves CONFIG_MICROROS_AGENT_IP/PORT, connect()s it, and uses
  send/recv. The socket fd is stashed in uxrCustomTransport->args
  so no module-level state is needed.

transport/microros_transport_serial.c
  termios serial backend. Opens CONFIG_MICROROS_SERIAL_DEVICE with
  O_RDWR|O_NOCTTY|O_CLOEXEC, switches to raw 8N1 at
  CONFIG_MICROROS_SERIAL_BAUD, and uses poll/read/write. Fd is
  again stashed in uxrCustomTransport->args.

Both backends are mutually exclusive at compile time via Kconfig;
the dispatcher selects which set of callbacks to register. Wired
into both the legacy Make build (CSRCS in system/microros/Makefile)
and the CMake build (separate microros_transport static library
with the transport directory only exposed to its INTERFACE).

Signed-off-by: Arjav Patel <arjav1528@gmail.com>
2026-06-02 00:15:25 +08:00

50 lines
1.7 KiB
C

/****************************************************************************
* apps/include/system/microros_transport.h
*
* SPDX-License-Identifier: Apache-2.0
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
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****************************************************************************/
#ifndef __APPS_INCLUDE_SYSTEM_MICROROS_TRANSPORT_H
#define __APPS_INCLUDE_SYSTEM_MICROROS_TRANSPORT_H
#ifdef __cplusplus
extern "C"
{
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/* microros_transport_init
*
* Register the NuttX-native transport (UDP or Serial, selected by Kconfig)
* with the rmw_microxrcedds layer. Must be called once before
* rclc_support_init().
*
* Returns 0 on success, negated errno on failure.
*/
int microros_transport_init(void);
#ifdef __cplusplus
}
#endif
#endif /* __APPS_INCLUDE_SYSTEM_MICROROS_TRANSPORT_H */