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#!/usr/bin/env python
# Copyright 2020 The Pigweed Authors
#
# Licensed 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
#
# https://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 under
# the License.
"""Simple example script that uses pw_rpc."""
import argparse
import os
from pathlib import Path
import serial
from pw_hdlc.rpc import HdlcRpcClient, default_channels
# Point the script to the .proto file with our RPC services.
PROTO = Path(os.environ['PW_ROOT'], 'pw_rpc/echo.proto')
def script(device: str, baud: int) -> None:
# Set up a pw_rpc client that uses HDLC.
ser = serial.Serial(device, baud, timeout=0.01)
client = HdlcRpcClient(
lambda: ser.read(4096), [PROTO], default_channels(ser.write)
)
# Make a shortcut to the EchoService.
echo_service = client.rpcs().pw.rpc.EchoService
# Call some RPCs and check the results.
status, payload = echo_service.Echo(msg='Hello')
if status.ok():
print('The status was', status)
print('The payload was', payload)
else:
print('Uh oh, this RPC returned', status)
status, payload = echo_service.Echo(msg='Goodbye!')
print('The device says:', payload.msg)
def main():
parser = argparse.ArgumentParser(
description=__doc__,
formatter_class=argparse.ArgumentDefaultsHelpFormatter,
)
parser.add_argument(
'--device', '-d', default='/dev/ttyACM0', help='serial device to use'
)
parser.add_argument(
'--baud',
'-b',
type=int,
default=115200,
help='baud rate for the serial device',
)
script(**vars(parser.parse_args()))
if __name__ == '__main__':
main()
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