Add client. Fill in server.

am_i_up/client.py

@@ -0,0 +1,42 @@
+#
+# Copyright 2025 James Pace
+#
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at https://mozilla.org/MPL/2.0/.
+#
+# This Source Code Form is "Incompatible With Secondary Licenses", as
+# defined by the Mozilla Public License, v. 2.0.
+#
+import aiohttp
+import asyncio
+import rclpy
+import json
+
+def main(args=None):
+
+    rclpy.init(args=args)
+    node = rclpy.create_node('am_i_up_client')
+
+    action = node.declare_parameter('action', value="").value
+    options = node.declare_parameter('options', value=[""]).value
+
+    if "" == action:
+        raise RunTimeError("Need to provide an action to take.")
+
+    if action == 'ping':
+        asyncio.run(call_ping(options))
+
+async def call_ping(options):
+    if len(options) != 1 or options[0] == "":
+        raise RunTimeError("Ping option is an address as a string.")
+
+    request = {"address": options[0]}
+
+    print("Calling ping with request: {}", json.dumps(request))
+
+    async with aiohttp.ClientSession() as session:
+        async with session.get('http://localhost:8080/ping', json=request) as resp:
+            print(await resp.text())
+
+

am_i_up/server.py

@@ -12,6 +12,8 @@ from aiohttp import web
 import time
 from ament_index_python import get_package_share_directory
 import yaml
+import ipaddress
+import subprocess
 
 def main():
     facts = Facts()
@@ -34,6 +36,18 @@ class Facts:
     def get_uptime(self):
         return time.monotonic() - self._start_time
 
+    def do_ping(self, address):
+        # Make sure address is a ip address.
+        if not is_valid_ip(address):
+            return "Provied address ({}) is not valid.".format(address)
+
+        # Build command.
+        command = ["ping", "-W", "1", "-c", "1", address]
+        process = subprocess.run(command)
+        if process.returncode == 0:
+            return "{} responded to ping.".format(address)
+        return "{} did not respond to ping.".format(address)
+
     def get_env(self):
         env = {}
         # We're not going to return the whole environment because
@@ -77,8 +91,10 @@ class Routes:
         return web.Response(text=text)
 
     async def ping(self, request):
-        text = 'pong'
+        request_dict = await request.json()
-        return web.Response(text=text)
+        result = self._facts.do_ping(request_dict['address'])
+        resp = {"message": result}
+        return web.json_response(resp)
 
     async def uptime(self, request):
         resp = {"uptime": self._facts.get_uptime()}
@@ -95,3 +111,11 @@ class Routes:
     async def env(self, request):
         env = self._facts.get_env()
         return web.json_response(env)
+
+
+def is_valid_ip(address):
+    try:
+        ipaddress.ip_address(address)
+        return True
+    except ValueError:
+        return False

setup.py

@@ -18,7 +18,8 @@ setup(
     license='MPL 2.0',
     entry_points={
         'console_scripts': [
-            'am_i_up = am_i_up.am_i_up:main',
+            'server = am_i_up.server:main',
+            'client = am_i_up.client:main'
         ],
     },
 )