Make examples more regularized and focused, and add contribution guidelines for the examples folder

examples/CONTRIBUTING.md

@@ -0,0 +1,70 @@
+# Contributing Example Scripts
+
+Use this guide when adding or updating scripts in `examples/`.
+
+## Must-have checklist before opening a PR
+
+1. Script teaches one clear thing (its primary learning goal).
+2. File name matches that goal.
+3. Top docstring states purpose, transport scope, behavior, and expected output.
+4. Script has safe shutdown (`with ...` or `finally`) and graceful `KeyboardInterrupt` handling.
+5. Argument handling is clear (`argparse` preferred).
+6. Errors are explicit (no bare `except:`).
+7. The script is not a near-duplicate of an existing example.
+
+## Choose the right teaching goal
+
+Each example should have one primary lesson. Keep it focused.
+
+- Good: "Send one text message over serial."
+- Good: "Print inbound text messages."
+- Avoid: discovery + chat + config mutation all in one script unless that combined flow is the lesson.
+
+## Transport scope must be explicit
+
+State exactly what transports are supported and why.
+
+- Serial-only when that keeps the example simplest.
+- Multi-transport (Serial/TCP/BLE) only when transport selection is part of the lesson.
+- If TCP/BLE are supported, expose explicit flags (`--host`, `--ble`) and document defaults.
+
+## Behavior and output should be predictable
+
+Readers should know if the script sends, receives, mutates config, or combines those.
+
+- Receive examples: subscribe to the narrowest pubsub topic that matches the lesson.
+- Send examples: clarify destination behavior (broadcast default vs explicit destination).
+- Mutation examples: clearly document side effects.
+
+Output should make success easy to confirm:
+
+- Print concise, stable status/event lines.
+- Avoid noisy debug output unless the script is specifically diagnostic-focused.
+
+## Cleanup and error handling
+
+- Use context managers where practical; otherwise close interfaces in `finally`.
+- Handle `KeyboardInterrupt` cleanly.
+- Exit non-zero for invalid args, connection/setup failures, or command failures.
+
+## Naming guidance
+
+Use descriptive names tied to the teaching goal.
+
+- Prefer names like `tcp_connection_info_once.py` over `pub_sub_example.py`.
+- Prefer names like `tcp_pubsub_send_and_receive.py` over `pub_sub_example2.py`.
+- Avoid generic names such as `example2.py`.
+
+Keep existing filenames only when compatibility or discoverability outweighs clarity.
+
+## New script vs extending an existing one
+
+Create a new script when:
+
+- The learning goal is genuinely distinct.
+- Combining behaviors would make either example harder to understand.
+
+Extend an existing script when:
+
+- The change deepens the same lesson.
+- The resulting script remains focused and readable.

examples/get_hw.py

@@ -1,21 +1,42 @@
-"""Simple program to demo how to use meshtastic library.
-   To run: python examples/get_hw.py
+"""Print the local node hardware model.
+
+Purpose: show the narrowest read-only local hardware lookup.
+Transport scope: Serial only.
+Behavior: reads local node metadata and prints hwModel.
+Expected output: one hardware model line, if available.
+Cleanup/error handling: exits with code 3 for bad args and closes interface on exit.
 """
 
+import argparse
 import sys
 
-import meshtastic
 import meshtastic.serial_interface
 
-# simple arg check
-if len(sys.argv) != 1:
-    print(f"usage: {sys.argv[0]}")
-    print("Print the hardware model for the local node.")
-    sys.exit(3)
 
-iface = meshtastic.serial_interface.SerialInterface()
-if iface.nodes:
-    for n in iface.nodes.values():
-        if n["num"] == iface.myInfo.my_node_num:
-            print(n["user"]["hwModel"])
-iface.close()
+def main() -> int:
+    """Print the hardware model for the local node."""
+    if len(sys.argv) != 1:
+        print(f"usage: {sys.argv[0]}")
+        print("Print the hardware model for the local node.")
+        return 3
+
+    parser = argparse.ArgumentParser(description="Print local Meshtastic hardware model")
+    parser.parse_args()
+
+    try:
+        with meshtastic.serial_interface.SerialInterface() as iface:
+            if iface.nodes:
+                for node in iface.nodes.values():
+                    if node["num"] == iface.myInfo.my_node_num:
+                        print(node["user"]["hwModel"])
+                        break
+    except KeyboardInterrupt:
+        return 0
+    except Exception as exc:
+        print(f"Error: Could not read hardware model: {exc}")
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/hello_world_serial.py

@@ -1,19 +1,38 @@
-"""Simple program to demo how to use meshtastic library.
-   To run: python examples/hello_world_serial.py
+"""Send one text message over serial.
+
+Purpose: minimal send-only example.
+Transport scope: Serial only.
+Behavior: sends one message and exits.
+Expected output: no output on success.
+Cleanup/error handling: exits with code 3 for bad args, closes interface on exit.
 """
 
+import argparse
 import sys
 
-import meshtastic
 import meshtastic.serial_interface
 
-# simple arg check
-if len(sys.argv) < 2:
-    print(f"usage: {sys.argv[0]} message")
-    sys.exit(3)
 
-# By default will try to find a meshtastic device,
-# otherwise provide a device path like /dev/ttyUSB0
-iface = meshtastic.serial_interface.SerialInterface()
-iface.sendText(sys.argv[1])
-iface.close()
+def main() -> int:
+    """Parse arguments and send one text message."""
+    if len(sys.argv) < 2:
+        print(f"usage: {sys.argv[0]} message")
+        return 3
+
+    parser = argparse.ArgumentParser(description="Send one Meshtastic text message over serial")
+    parser.add_argument("message", help="Message text to broadcast")
+    args = parser.parse_args()
+
+    try:
+        with meshtastic.serial_interface.SerialInterface() as iface:
+            iface.sendText(args.message)
+    except KeyboardInterrupt:
+        return 0
+    except Exception as exc:
+        print(f"Error: Could not send message: {exc}")
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/info_example.py

@@ -1,20 +1,46 @@
-"""Simple program to demo how to use meshtastic library.
-   To run: python examples/info.py
+"""Show a concise local node summary over serial.
+
+Purpose: read local node identity and metadata in one place.
+Transport scope: Serial only.
+Behavior: reads node database, prints local node ID/name/hardware model.
+Expected output: 1-3 summary lines describing the local node.
+Cleanup/error handling: closes interface on exit and prints clear errors on failure.
 """
 
-import meshtastic
 import meshtastic.serial_interface
 
-iface = meshtastic.serial_interface.SerialInterface()
 
-# call showInfo() just to ensure values are populated
-# info = iface.showInfo()
+def main() -> int:
+    """Print local node summary fields."""
+    try:
+        with meshtastic.serial_interface.SerialInterface() as iface:
+            local_num = iface.myInfo.my_node_num
+            local_node = None
+            if iface.nodes:
+                for node in iface.nodes.values():
+                    if node["num"] == local_num:
+                        local_node = node
+                        break
+
+            if not local_node:
+                print(f"Local node not found in node database (node num: {local_num}).")
+                return 1
+
+            user = local_node.get("user", {})
+            print(f"Node number: {local_num}")
+            print(f"Node ID: {local_node.get('id', 'unknown')}")
+            print(
+                "Name: "
+                f"{user.get('longName', 'unknown')} ({user.get('shortName', 'unknown')})"
+            )
+            print(f"Hardware model: {user.get('hwModel', 'unknown')}")
+    except KeyboardInterrupt:
+        return 0
+    except Exception as exc:
+        print(f"Error: Could not read local node summary: {exc}")
+        return 1
+    return 0
 
 
-if iface.nodes:
-    for n in iface.nodes.values():
-        if n["num"] == iface.myInfo.my_node_num:
-            print(n["user"]["hwModel"])
-            break
-
-iface.close()
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/meshtastic_serial_message_reader.py

@@ -1,58 +1,64 @@
 #!/usr/bin/env python3
-#
-# Released Under GNU GPLv3
-# Copyright 2025 Henri Shustak
-#
-# About :
-#    This script will print messages as they arrive from a meshtastic node connected via serial port USB.
-#    If you have multiple nodes attached, you will need to edit this script and specify the node to monitor.
-#
-# Requirements :
-#    You will need to install python meshtastic libraries : https://github.com/meshtastic/python
-#
-# Version History :
-#    1.0 - initial release
-#    1.1 - added support for sender id and bug fixes
-#    1.2 - added date and time reporting to each message
-#    1.3 - bug fixes and improved error handling
+"""Passively monitor incoming text messages over serial.
 
+Purpose: receive-only monitor for text messages.
+Transport scope: Serial only.
+Behavior: subscribes to text receive events and prints timestamp/channel/sender/text.
+Expected output: one line per received text message.
+Cleanup/error handling: graceful Ctrl+C exit and explicit connection errors.
+"""
+
+import argparse
 import time
-from datetime import datetime, timezone
-import meshtastic
-import meshtastic.serial_interface
-from pubsub import pub
+from datetime import datetime
+from typing import Any, Optional
 
-def onReceive(packet, interface):
-    # DEBUGGING
-    # print(f"message arrived")
-    # print(f"{packet}")
-    # print(f"-----------------------------------------------------------------")
-    try:
-        if packet['decoded']['portnum'] == 'TEXT_MESSAGE_APP':
-            try:
-                message = packet['decoded']['text']
-                try:
-                    channel_num = packet['channel']
-                except KeyError as e1:
-                    channel_num = 0
-                sender_id = packet['fromId']
-                message_time = datetime.now().strftime(f"%a %b %d %Y %H:%M:%S {tz_name}")
-                print(f"{message_time} : {channel_num} : {sender_id}  :  {message}")
-            except KeyError as e2:
-                print(f"unable to decode message")
-                return
-    except KeyError as e3:
+from pubsub import pub
+import meshtastic.serial_interface
+
+_TZ_NAME = time.tzname[time.localtime().tm_isdst > 0]
+
+
+def on_receive(packet: dict[str, Any], interface: Any) -> None:  # pylint: disable=unused-argument
+    """Print a compact line for each received text packet."""
+    decoded = packet.get("decoded", {})
+    if decoded.get("portnum") != "TEXT_MESSAGE_APP":
         return
 
-# configure the local time zone
-tz_name = time.tzname[time.localtime().tm_isdst > 0]
+    message = decoded.get("text")
+    if not message:
+        return
 
-# registrer for incomming messages
-#pub.subscribe(onReceive, "meshtastic.receive.text")
-pub.subscribe(onReceive, "meshtastic.receive")
+    channel_num = packet.get("channel", 0)
+    sender_id = packet.get("fromId", "unknown")
+    message_time = datetime.now().strftime(f"%a %b %d %Y %H:%M:%S {_TZ_NAME}")
+    print(f"{message_time} : {channel_num} : {sender_id} : {message}")
 
-# attempt to locate a meshtastic device, otherwise provide a device path like /dev/ttyUSB0
-interface = meshtastic.serial_interface.SerialInterface()
 
-while True:
-    time.sleep(10)  # wait for the next message
+def main() -> int:
+    """Connect over serial and print inbound text messages."""
+    parser = argparse.ArgumentParser(description="Read incoming Meshtastic text over serial")
+    parser.add_argument("--port", default=None, help="Serial port path (default: auto-detect)")
+    args = parser.parse_args()
+
+    pub.subscribe(on_receive, "meshtastic.receive")
+
+    iface: Optional[meshtastic.serial_interface.SerialInterface] = None
+    try:
+        iface = meshtastic.serial_interface.SerialInterface(devPath=args.port)
+        print("Connected. Listening for text messages. Press Ctrl+C to exit.")
+        while True:
+            time.sleep(1)
+    except KeyboardInterrupt:
+        return 0
+    except Exception as exc:
+        print(f"Error: Could not monitor serial messages: {exc}")
+        return 1
+    finally:
+        if iface:
+            iface.close()
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/pub_sub_example.py

@@ -1,30 +0,0 @@
-"""Simple program to demo how to use meshtastic library.
-   To run: python examples/pub_sub_example.py
-"""
-
-import sys
-
-from pubsub import pub
-
-import meshtastic
-import meshtastic.tcp_interface
-
-# simple arg check
-if len(sys.argv) < 2:
-    print(f"usage: {sys.argv[0]} host")
-    sys.exit(1)
-
-
-def onConnection(interface, topic=pub.AUTO_TOPIC):  # pylint: disable=unused-argument
-    """This is called when we (re)connect to the radio."""
-    print(interface.myInfo)
-    interface.close()
-
-
-pub.subscribe(onConnection, "meshtastic.connection.established")
-
-try:
-    iface = meshtastic.tcp_interface.TCPInterface(sys.argv[1])
-except:
-    print(f"Error: Could not connect to {sys.argv[1]}")
-    sys.exit(1)

examples/pub_sub_example2.py

@@ -1,42 +0,0 @@
-"""Simple program to demo how to use meshtastic library.
-   To run: python examples/pub_sub_example2.py
-"""
-
-import sys
-import time
-
-from pubsub import pub
-
-from meshtastic.tcp_interface import TCPInterface
-
-# simple arg check
-if len(sys.argv) < 2:
-    print(f"usage: {sys.argv[0]} host")
-    sys.exit(1)
-
-
-def onReceive(packet, interface):  # pylint: disable=unused-argument
-    """called when a packet arrives"""
-    print(f"Received: {packet}")
-
-
-def onConnection(interface, topic=pub.AUTO_TOPIC):  # pylint: disable=unused-argument
-    """called when we (re)connect to the radio"""
-    # defaults to broadcast, specify a destination ID if you wish
-    interface.sendText("hello mesh")
-
-
-pub.subscribe(onReceive, "meshtastic.receive")
-pub.subscribe(onConnection, "meshtastic.connection.established")
-
-iface=None
-try:
-    iface = TCPInterface(hostname=sys.argv[1])
-    while True:
-        time.sleep(1000)
-except Exception as ex:
-    print(f"Error: Could not connect to {sys.argv[1]} {ex}")
-    raise
-finally:
-    if iface:
-        iface.close()

examples/replymessage.py

@@ -1,7 +1,10 @@
-"""Reply message demo script.
-   To run: python examples/replymessage.py
-   To run with TCP: python examples/replymessage.py --host 192.168.1.5
-   To run with BLE: python examples/replymessage.py --ble 24:62:AB:DD:DF:3A
+"""Auto-reply to received text messages.
+
+Purpose: demonstrate receive callback + generated reply flow.
+Transport scope: Serial default, optional TCP/BLE.
+Behavior: listens for text, prints message metadata, sends one reply per text message.
+Expected output: "Connected..." plus message/reply lines while running.
+Cleanup/error handling: clear connect failures and graceful Ctrl+C close.
 """
 
 import argparse
@@ -13,7 +16,7 @@ import meshtastic.tcp_interface
 import meshtastic.ble_interface
 from meshtastic.mesh_interface import MeshInterface
 
-def onReceive(packet: dict, interface: MeshInterface) -> None:  # pylint: disable=unused-argument
+def onReceive(packet: dict, interface: MeshInterface) -> None:
     """Reply to every received packet with some info"""
     text: Optional[str] = packet.get("decoded", {}).get("text")
     if text:
@@ -66,8 +69,5 @@ try:
 except KeyboardInterrupt:
     pass
 finally:
-    try:
-        if iface:
-            iface.close()
-    except AttributeError:
-        pass
+    if iface:
+        iface.close()

examples/scan_for_devices.py

@@ -1,7 +1,13 @@
-"""Program to scan for hardware
-   To run: python examples/scan_for_devices.py
+"""Scan host serial hardware for supported Meshtastic devices.
+
+Purpose: host-side discovery without opening a radio session.
+Transport scope: none (OS/device scanning only).
+Behavior: scans vendor IDs, lists matched devices, and candidate active ports.
+Expected output: vendor ID list, zero-or-more detected devices, and port list.
+Cleanup/error handling: exits with code 3 for bad args and code 1 on scan errors.
 """
 
+import argparse
 import sys
 
 from meshtastic.util import (
@@ -10,20 +16,38 @@ from meshtastic.util import (
     get_unique_vendor_ids,
 )
 
-# simple arg check
-if len(sys.argv) != 1:
-    print(f"usage: {sys.argv[0]}")
-    print("Detect which device we might have.")
-    sys.exit(3)
 
-vids = get_unique_vendor_ids()
-print(f"Searching for all devices with these vendor ids {vids}")
+def main() -> int:
+    """Run device detection and print candidate ports."""
+    if len(sys.argv) != 1:
+        print(f"usage: {sys.argv[0]}")
+        print("Detect which device we might have.")
+        return 3
 
-sds = detect_supported_devices()
-if len(sds) > 0:
-    print("Detected possible devices:")
-for d in sds:
-    print(f" name:{d.name}{d.version} firmware:{d.for_firmware}")
+    parser = argparse.ArgumentParser(description="Scan host for supported Meshtastic devices")
+    parser.parse_args()
 
-ports = active_ports_on_supported_devices(sds)
-print(f"ports:{ports}")
+    try:
+        vids = get_unique_vendor_ids()
+        print(f"Searching for all devices with these vendor ids {vids}")
+
+        supported_devices = detect_supported_devices()
+        if supported_devices:
+            print("Detected possible devices:")
+            for device in supported_devices:
+                print(
+                    f" name:{device.name}{device.version} firmware:{device.for_firmware}"
+                )
+        else:
+            print("Detected possible devices: none")
+
+        ports = active_ports_on_supported_devices(supported_devices)
+        print(f"ports:{ports}")
+    except Exception as exc:
+        print(f"Error: device scan failed: {exc}")
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/set_owner.py

@@ -1,21 +1,40 @@
-"""Simple program to demo how to use meshtastic library.
-   To run: python examples/set_owner.py Bobby 333
+"""Set local owner long/short name over serial.
+
+Purpose: demonstrate a local config mutation workflow.
+Transport scope: Serial only.
+Behavior: updates owner long name and optional short name.
+Expected output: prints the owner values being applied.
+Cleanup/error handling: exits with code 3 for bad args and closes interface on exit.
 """
 
+import argparse
 import sys
 
-import meshtastic
 import meshtastic.serial_interface
 
-# simple arg check
-if len(sys.argv) < 2:
-    print(f"usage: {sys.argv[0]} long_name [short_name]")
-    sys.exit(3)
 
-iface = meshtastic.serial_interface.SerialInterface()
-long_name = sys.argv[1]
-short_name = None
-if len(sys.argv) > 2:
-    short_name = sys.argv[2]
-iface.localNode.setOwner(long_name, short_name)
-iface.close()
+def main() -> int:
+    """Parse args and set owner fields."""
+    if len(sys.argv) < 2:
+        print(f"usage: {sys.argv[0]} long_name [short_name]")
+        return 3
+
+    parser = argparse.ArgumentParser(description="Set Meshtastic local owner information")
+    parser.add_argument("long_name", help="Owner long name")
+    parser.add_argument("short_name", nargs="?", default=None, help="Owner short name")
+    args = parser.parse_args()
+
+    print(f"Setting owner long_name={args.long_name}, short_name={args.short_name}")
+    try:
+        with meshtastic.serial_interface.SerialInterface() as iface:
+            iface.localNode.setOwner(args.long_name, args.short_name)
+    except KeyboardInterrupt:
+        return 0
+    except Exception as exc:
+        print(f"Error: Could not set owner: {exc}")
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/show_ports.py

@@ -1,6 +1,24 @@
-"""Simple program to show serial ports.
+"""List serial ports currently visible to Meshtastic helpers.
+
+Purpose: fastest host-side serial port enumeration.
+Transport scope: none (host serial listing only).
+Behavior: prints result of `findPorts()`.
+Expected output: list-like representation of available candidate ports.
+Cleanup/error handling: exits with code 1 on unexpected scan error.
 """
 
 from meshtastic.util import findPorts
 
-print(findPorts())
+
+def main() -> int:
+    """Print discovered serial ports."""
+    try:
+        print(findPorts())
+    except Exception as exc:
+        print(f"Error: Could not list ports: {exc}")
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/tcp_connection_info_once.py

@@ -0,0 +1,41 @@
+"""Connect over TCP, print connection info once, then exit.
+
+Purpose: demonstrate pubsub connection lifecycle callback.
+Transport scope: TCP only.
+Behavior: subscribe to `meshtastic.connection.established`, print `myInfo`, then close.
+Expected output: one object/line showing local radio info after connect.
+Cleanup/error handling: explicit connect failure message and clean close on callback.
+"""
+
+import argparse
+
+from pubsub import pub
+import meshtastic.tcp_interface
+
+
+def on_connection(interface, topic=pub.AUTO_TOPIC):  # pylint: disable=unused-argument
+    """Print local radio info when connected, then close."""
+    print(interface.myInfo)
+    interface.close()
+
+
+def main() -> int:
+    """Parse args, connect, and wait for established callback."""
+    parser = argparse.ArgumentParser(description="Print radio info on TCP connect and exit")
+    parser.add_argument("host", help="TCP hostname or IP of the Meshtastic node")
+    args = parser.parse_args()
+
+    pub.subscribe(on_connection, "meshtastic.connection.established")
+
+    try:
+        meshtastic.tcp_interface.TCPInterface(args.host)
+    except KeyboardInterrupt:
+        return 0
+    except Exception as exc:
+        print(f"Error: Could not connect to {args.host}: {exc}")
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/tcp_gps_example.py

@@ -1,14 +1,47 @@
-"""Demonstration of how to look up a radio's location via its LAN connection.
-   Before running, connect your machine to the same WiFi network as the radio.
-"""
+"""Look up local node position over TCP.
+
+Purpose: demonstrate read-only position lookup via LAN/TCP.
+Transport scope: TCP only.
+Behavior: connects, reads local node position, prints it, then exits.
+Expected output: position dict for local node.
+Cleanup/error handling: explicit connect/read failures and clean close.
+"""
+# pylint: disable=duplicate-code
+
+import argparse
 
-import meshtastic
 import meshtastic.tcp_interface
 
-radio_hostname = "meshtastic.local"  # Can also be an IP
-iface = meshtastic.tcp_interface.TCPInterface(radio_hostname)
-my_node_num = iface.myInfo.my_node_num
-pos = iface.nodesByNum[my_node_num]["position"]
-print(pos)
 
-iface.close()
+def main() -> int:
+    """Connect over TCP and print local node position."""
+    parser = argparse.ArgumentParser(description="Print local node position over TCP")
+    parser.add_argument(
+        "--host",
+        default="meshtastic.local",
+        help="TCP hostname or IP (default: meshtastic.local)",
+    )
+    args = parser.parse_args()
+
+    iface = None
+    try:
+        iface = meshtastic.tcp_interface.TCPInterface(args.host)
+        my_node_num = iface.myInfo.my_node_num
+        pos = iface.nodesByNum[my_node_num].get("position")
+        if pos is None:
+            print(f"No position available for local node {my_node_num}")
+            return 1
+        print(pos)
+    except KeyboardInterrupt:
+        return 0
+    except Exception as exc:
+        print(f"Error: Could not read position from {args.host}: {exc}")
+        return 1
+    finally:
+        if iface:
+            iface.close()
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/tcp_pubsub_send_and_receive.py

@@ -0,0 +1,54 @@
+"""Send once on connect and print received packets over TCP.
+
+Purpose: demonstrate pubsub send-on-connect plus receive callback flow.
+Transport scope: TCP only.
+Behavior: sends "hello mesh" at connect, prints packets while running.
+Expected output: "Connected..." plus "Received: ..." lines for inbound packets.
+Cleanup/error handling: graceful Ctrl+C exit and clean interface close.
+"""
+
+import argparse
+import time
+
+from pubsub import pub
+from meshtastic.tcp_interface import TCPInterface
+
+
+def on_receive(packet, interface):  # pylint: disable=unused-argument
+    """Print each inbound packet."""
+    print(f"Received: {packet}")
+
+
+def on_connection(interface, topic=pub.AUTO_TOPIC):  # pylint: disable=unused-argument
+    """Send a broadcast text when connected."""
+    print("Connected. Sending one broadcast message.")
+    interface.sendText("hello mesh")
+
+
+def main() -> int:
+    """Parse args, connect via TCP, and run callbacks."""
+    parser = argparse.ArgumentParser(description="TCP pubsub send-and-receive example")
+    parser.add_argument("host", help="TCP hostname or IP of the Meshtastic node")
+    args = parser.parse_args()
+
+    pub.subscribe(on_receive, "meshtastic.receive")
+    pub.subscribe(on_connection, "meshtastic.connection.established")
+
+    iface = None
+    try:
+        iface = TCPInterface(hostname=args.host)
+        while True:
+            time.sleep(1)
+    except KeyboardInterrupt:
+        return 0
+    except Exception as exc:
+        print(f"Error: Could not connect to {args.host}: {exc}")
+        return 1
+    finally:
+        if iface:
+            iface.close()
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())

examples/textchat.py

@@ -1,7 +1,10 @@
-"""Simple text chat demo for meshtastic.
-   To run: python examples/textchat.py
-   To run with TCP: python examples/textchat.py --host 192.168.1.5
-   To run with BLE: python examples/textchat.py --ble 24:62:AB:DD:DF:3A
+"""Interactive text chat demo.
+
+Purpose: demonstrate bidirectional text chat loop.
+Transport scope: Serial default, optional TCP/BLE.
+Behavior: prints incoming messages and sends each typed line as text.
+Expected output: incoming sender/text lines and sent messages reaching peers.
+Cleanup/error handling: explicit connect errors and graceful Ctrl+C / EOF close.
 """
 
 import argparse
@@ -66,8 +69,5 @@ except KeyboardInterrupt:
 except EOFError:
     pass
 finally:
-    try:
-        if iface:
-            iface.close()
-    except AttributeError:
-        pass
+    if iface:
+        iface.close()

examples/waypoint.py

@@ -1,7 +1,10 @@
-"""Program to create and delete waypoint
-   To run:
-   python3 examples/waypoint.py --port /dev/ttyUSB0 create 45 test the_desc_2 '2024-12-18T23:05:23' 48.74 7.35
-   python3 examples/waypoint.py delete 45
+"""Create or delete a waypoint.
+
+Purpose: demonstrate waypoint mutation API (create/delete).
+Transport scope: Serial only.
+Behavior: sends waypoint create/delete request and prints API response.
+Expected output: request response object printed to stdout.
+Cleanup/error handling: explicit argument parsing and clean interface close.
 """
 
 import argparse
@@ -12,26 +15,28 @@ import meshtastic
 import meshtastic.serial_interface
 
 parser = argparse.ArgumentParser(
-                    prog='waypoint',
-                    description='Create and delete Meshtastic waypoint')
-parser.add_argument('--port', default=None)
-parser.add_argument('--debug', default=False, action='store_true')
+    prog="waypoint", description="Create and delete Meshtastic waypoint"
+)
+parser.add_argument("--port", default=None)
+parser.add_argument("--debug", default=False, action="store_true")
 
-subparsers = parser.add_subparsers(dest='cmd')
-parser_delete = subparsers.add_parser('delete', help='Delete a waypoint')
-parser_delete.add_argument('id', help="id of the waypoint")
+subparsers = parser.add_subparsers(dest="cmd", required=True)
+parser_delete = subparsers.add_parser("delete", help="Delete a waypoint")
+parser_delete.add_argument("id", type=int, help="ID of the waypoint")
 
-parser_create = subparsers.add_parser('create', help='Create a new waypoint')
-parser_create.add_argument('id', help="id of the waypoint")
-parser_create.add_argument('name', help="name of the waypoint")
-parser_create.add_argument('description', help="description of the waypoint")
-parser_create.add_argument('icon', help="icon of the waypoint")
-parser_create.add_argument('expire', help="expiration date of the waypoint as interpreted by datetime.fromisoformat")
-parser_create.add_argument('latitude', help="latitude of the waypoint")
-parser_create.add_argument('longitude', help="longitude of the waypoint")
+parser_create = subparsers.add_parser("create", help="Create a new waypoint")
+parser_create.add_argument("id", type=int, help="ID of the waypoint")
+parser_create.add_argument("name", help="Name of the waypoint")
+parser_create.add_argument("description", help="Description of the waypoint")
+parser_create.add_argument("icon", help="Icon of the waypoint")
+parser_create.add_argument(
+    "expire",
+    help="Expiration time as ISO timestamp accepted by datetime.fromisoformat",
+)
+parser_create.add_argument("latitude", type=float, help="Latitude of the waypoint")
+parser_create.add_argument("longitude", type=float, help="Longitude of the waypoint")
 
 args = parser.parse_args()
-print(args)
 
 # By default will try to find a meshtastic device,
 # otherwise provide a device path like /dev/ttyUSB0
@@ -40,18 +45,16 @@ if args.debug:
 else:
     d = None
 with meshtastic.serial_interface.SerialInterface(args.port, debugOut=d) as iface:
-    if args.cmd == 'create':
+    if args.cmd == "create":
         p = iface.sendWaypoint(
-            waypoint_id=int(args.id),
+            waypoint_id=args.id,
             name=args.name,
             description=args.description,
             icon=args.icon,
             expire=int(datetime.datetime.fromisoformat(args.expire).timestamp()),
-            latitude=float(args.latitude),
-            longitude=float(args.longitude),
+            latitude=args.latitude,
+            longitude=args.longitude,
         )
     else:
-        p = iface.deleteWaypoint(int(args.id))
+        p = iface.deleteWaypoint(args.id)
     print(p)
-
-# iface.close()