fix the readme

README.md

@@ -65,10 +65,10 @@ You can fake the presence of a Serial device (i.e., MCU) by using the following
 $ socat -dd -v pty,rawer,crnl,link=/tmp/ttyACM9 pty,rawer,crnl,link=/tmp/ttyOUT
 ```
 
-When you go to run anchor, use the `PORT_OVERRIDE` environment variable to point it to the fake serial port, like so:
+When you go to run anchor, use the `port_override` launch parameter to point it to the fake serial port, like so:
 
 ```bash
-$ PORT_OVERRIDE=/tmp/ttyACM9 ros2 launch anchor_pkg rover.launch.py
+$ ros2 launch anchor_pkg rover.launch.py port_override:=/tmp/ttyACM9
 ```
 
 ### Connecting the GuliKit Controller
@@ -121,23 +121,24 @@ A: Don't worry about it. If you had the workspace sourced, ROS2 will complain ab
 ...
 ```
 
-A: To find a microcontroller to talk to, Anchor sends a ping to every Serial port on your computer. If it does not receive a 'pong' in less than one second, then it aborts. There are a few possible fixes:
+A: To find a microcontroller to talk to, Anchor filters through your available serial ports to find microcontrollers. If the microcontroller fails
+to respond properly, or one is not found, it will abort. There are a few possible fixes:
 
 - Keep trying to run it until it works
 - Run `lsusb` to see if the microcontroller is detected by your computer.
 - Run `ls /dev/tty*0` to see if there is a valid Serial port enumerated for the microcontroller.
-- Check if you are in the `dialout` group (or whatever group shows up by running `ls -l /dev/tty*`).
+- Check if you are in the `dialout` group (or whatever group shows up by running `ls -l /dev/tty*`) by using the `groups` command.
 
 ## Packages
 
 - [anchor\_pkg](./src/anchor_pkg) - Handles Serial communication between the various other packages here and the microcontroller.
 - [arm\_pkg](./src/arm_pkg) - Relays controls and sensor data for the arm (socket and digit) between anchor and basestation/headless.
 - [astra\_descriptions](./src/astra_descriptions) - Submodule with URDF-related packages.
+- [astra\_msgs](./src/astra_msgs) - Contains custom message types for communication between basestation and the rover over ROS2.
 - [bio\_pkg](./src/bio_pkg) - Like arm_pkg, but for CITADEL and FAERIE
 - [core\_pkg](./src/core_pkg) - Like arm_pkg, but for Core
 - [headless\_pkg](./src/headless_pkg) - Simple, non-graphical controller node to work in place of basestation when controlling the rover by itself. This is autostarted with anchor to allow for setup-less control of the rover.
 - [latency\_tester](./src/latency_tester) - A temporary node to test comms latency over ROS2, Serial, and CAN.
-- [ros2\_interfaces\_pkg](./src/ros2_interfaces_pkg) - Contains custom message types for communication between basestation and the rover over ROS2. (being renamed to `astra_msgs`).
 - [servo\_arm\_twist\_pkg](./src/servo_arm_twist_pkg) - A temporary node to translate controller state from `ros2_joy` to `Twist` messages to control the Arm via IK.
 
 ## Maintainers

src/anchor_pkg/anchor_pkg/anchor_node.py

@@ -1,20 +1,17 @@
-import rclpy
-from rclpy.node import Node
-from rclpy.executors import ExternalShutdownException
-from std_srvs.srv import Empty
-
-import signal
-import time
 import atexit
+import glob
+import signal
+import threading
+from typing import cast
 
+import rclpy
 import serial
 import serial.tools.list_ports
-import os
-import sys
-import threading
-import glob
+from rcl_interfaces.msg import ParameterDescriptor, ParameterType
+from rclpy.executors import ExternalShutdownException
+from rclpy.node import Node
+from std_msgs.msg import Header, String
 
-from std_msgs.msg import String, Header
 from astra_msgs.msg import VicCAN
 
 KNOWN_USBS = [
@@ -46,15 +43,23 @@ class Anchor(Node):
         - Publish raw strings to this topic to send directly to the MCU for debugging
     """
 
+    serial_port: str | None = None  # e.g., "/dev/ttyUSB0"
+
     def __init__(self):
         # Initalize node with name
-        super().__init__("anchor_node")  # previously 'serial_publisher'
+        super().__init__("anchor_node")
 
-        self.serial_port: str | None = None  # e.g., "/dev/ttyUSB0"
+        self.declare_parameter(
+            "port_override",
+            "",
+            ParameterDescriptor(
+                name="port_override", type=ParameterType.PARAMETER_STRING
+            ),
+        )
 
         # Serial port override
-        if port_override := os.getenv("PORT_OVERRIDE"):
-            self.serial_port = port_override
+        if port_override := self.get_parameter("port_override").value:
+            self.serial_port = cast(str, port_override)  # Cast to make the linter happy
 
         ##################################################
         # Serial MCU Discovery
@@ -62,104 +67,64 @@ class Anchor(Node):
         # If there was not a port override, look for a MCU over USB for Serial.
         if self.serial_port is None:
             comports = serial.tools.list_ports.comports()
-            real_ports = list(
+            recog_ports = list(
                 filter(
-                    lambda p: p.vid is not None
-                    and p.pid is not None
-                    and p.device is not None,
+                    # Filter for ports we know that aren't invalid
+                    lambda p: (p.vid, p.pid) in KNOWN_USBS and p.device is not None,
                     comports,
                 )
             )
-            recog_ports = list(filter(lambda p: (p.vid, p.pid) in KNOWN_USBS, comports))
 
-            if len(recog_ports) == 1:  # Found singular recognized MCU
-                found_port = recog_ports[0]
-                self.get_logger().info(
-                    f"Selecting MCU '{found_port.description}' at {found_port.device}."
-                )
-                self.serial_port = found_port.device  # String, location of device file; e.g., '/dev/ttyACM0'
-            elif len(recog_ports) > 1:  # Found multiple recognized MCUs
-                # Kinda jank log message
-                self.get_logger().error(
+            # Guards
+            if len(recog_ports) > 1:  # If we found too many
+                self.get_logger().fatal(
                     f"Found multiple recognized MCUs: {[p.device for p in recog_ports].__str__()}"
                 )
-                # Don't set self.serial_port; later if-statement will exit()
-            elif (
-                len(recog_ports) == 0 and len(real_ports) > 0
-            ):  # Found real ports but none recognized; i.e. maybe found an IMU or camera but not a MCU
-                self.get_logger().error(
-                    f"No recognized MCUs found; instead found {[p.device for p in real_ports].__str__()}."
+                exit(1)
+            if len(recog_ports) == 0:
+                self.get_logger().fatal(
+                    f"Found no recognized MCUs: {[p.device for p in recog_ports].__str__()}"
                 )
-                # Don't set self.serial_port; later if-statement will exit()
-            else:  # Found jack shit
-                self.get_logger().error("No valid Serial ports specified or found.")
-                # Don't set self.serial_port; later if-statement will exit()
+                exit(1)
 
-        # We still don't have a serial port; fall back to legacy discovery (Areeb's code)
-        # Loop through all serial devices on the computer to check for the MCU
-        if self.serial_port is None:
-            self.get_logger().warning("Falling back to legacy MCU discovery...")
-            ports = Anchor.list_serial_ports()
-            for _ in range(4):
-                if self.serial_port is not None:
-                    break
-                for port in ports:
-                    try:
-                        # connect and send a ping command
-                        ser = serial.Serial(port, 115200, timeout=1)
-                        # (f"Checking port {port}...")
-                        ser.write(b"ping\n")
-                        response = ser.read_until(bytes("\n", "utf8"))
-
-                        # if pong is in response, then we are talking with the MCU
-                        if b"pong" in response:
-                            self.serial_port = port
-                            self.get_logger().info(f"Found MCU at {self.serial_port}!")
-                            break
-                    except:
-                        pass
-
-        # If port is still None then we ain't finding no mcu
-        if self.serial_port is None:
-            self.get_logger().error("Unable to find MCU. Exiting...")
-            time.sleep(1)
-            sys.exit(1)
-        # Found a Serial port, try to open it; above code has not officially opened a Serial port
-        else:
-            self.get_logger().debug(
-                f"Attempting to open Serial port '{self.serial_port}'..."
+            # Everything is ok
+            found_port = recog_ports[0]
+            self.get_logger().info(
+                f"Selecting MCU '{found_port.description}' at {found_port.device}."
             )
-            try:
-                self.serial_interface = serial.Serial(
-                    self.serial_port, 115200, timeout=1
-                )
+            # String, location of device file; e.g., '/dev/ttyACM0'
+            self.serial_port = found_port.device
 
-                # Attempt to get name of connected MCU
-                self.serial_interface.write(
-                    b"can_relay_mode,on\n"
-                )  # can_relay_ready,[mcu]
-                mcu_name: str = ""
-                for _ in range(4):
-                    response = self.serial_interface.read_until(bytes("\n", "utf8"))
+        # Found a Serial port, try to open it; above code has not officially opened a Serial port
+        self.get_logger().debug(
+            f"Attempting to open Serial port '{self.serial_port}'..."
+        )
+        try:
+            self.serial_interface = serial.Serial(self.serial_port, 115200, timeout=1)
+
+            # Attempt to get name of connected MCU
+            self.serial_interface.write(b"can_relay_mode,on\n")  # can_relay_ready,[mcu]
+            mcu_name: str = ""
+            for _ in range(4):  # Sometimes it takes a sec
+                response = self.serial_interface.read_until(bytes("\n", "utf8"))
+                if b"can_relay_ready" in response:
                     try:
-                        if b"can_relay_ready" in response:
-                            args: list[str] = response.decode("utf8").strip().split(",")
-                            if len(args) == 2:
-                                mcu_name = args[1]
-                            break
+                        args: list[str] = response.decode("utf8").strip().split(",")
                     except UnicodeDecodeError:
-                        pass  # ignore malformed responses
-                self.get_logger().info(
-                    f"MCU '{mcu_name}' is ready at '{self.serial_port}'."
-                )
+                        continue  # ignore malformed responses
+                    if len(args) == 2:
+                        mcu_name = args[1]
+                    break
+            self.get_logger().info(
+                f"MCU '{mcu_name}' is ready at '{self.serial_port}'."
+            )
 
-            except serial.SerialException as e:
-                self.get_logger().error(
-                    f"Could not open Serial port '{self.serial_port}' for reason:"
-                )
-                self.get_logger().error(e.strerror)
-                time.sleep(1)
-                sys.exit(1)
+        except serial.SerialException as e:
+            self.get_logger().fatal(
+                f"Could not open Serial port '{self.serial_port}' for reason:"
+            )
+            self.get_logger().fatal(e.strerror)
+            exit(1)
 
         # Close serial port on exit
         atexit.register(self.cleanup)
@@ -205,54 +170,38 @@ class Anchor(Node):
 
     def read_MCU(self):
         """Check the USB serial port for new data from the MCU, and publish string to appropriate topics"""
+        output: str | None = None
         try:
             output = str(self.serial_interface.readline(), "utf8")
-
-            if output:
-                self.relay_fromvic(output)
-                # All output over debug temporarily
-                # self.get_logger().info(f"[MCU] {output}")
-                msg = String()
-                msg.data = output
-                self.debug_pub.publish(msg)
-                if output.startswith("can_relay_fromvic,core"):
-                    self.core_pub.publish(msg)
-                elif output.startswith("can_relay_fromvic,arm") or output.startswith(
-                    "can_relay_fromvic,digit"
-                ):  # digit for voltage readings
-                    self.arm_pub.publish(msg)
-                if output.startswith("can_relay_fromvic,citadel") or output.startswith(
-                    "can_relay_fromvic,digit"
-                ):  # digit for SHT sensor
-                    self.bio_pub.publish(msg)
-                # msg = String()
-                # msg.data = output
-                # self.debug_pub.publish(msg)
-                return
         except serial.SerialException as e:
-            print(f"SerialException: {e}")
-            print("Closing serial port.")
-            try:
-                if self.serial_interface.is_open:
-                    self.serial_interface.close()
-            except:
-                pass
+            self.get_logger().fatal(f"SerialException: {e}")
             exit(1)
         except TypeError as e:
-            print(f"TypeError: {e}")
-            print("Closing serial port.")
-            try:
-                if self.serial_interface.is_open:
-                    self.serial_interface.close()
-            except:
-                pass
+            self.get_logger().fatal(f"TypeError: {e}")
             exit(1)
         except Exception as e:
-            print(f"Exception: {e}")
-            # print("Closing serial port.")
-            # if self.ser.is_open:
-            #     self.ser.close()
-            # exit(1)
+            self.get_logger().error(f"Exception: {e}")
+
+        if output:
+            self.relay_fromvic(output)
+            msg = String()
+            msg.data = output
+
+            # All output over debug
+            self.debug_pub.publish(msg)
+
+            # Send the message to the right place
+            if output.startswith("can_relay_fromvic,core"):
+                self.core_pub.publish(msg)
+            elif output.startswith("can_relay_fromvic,arm") or output.startswith(
+                "can_relay_fromvic,digit"
+            ):  # digit for voltage readings
+                self.arm_pub.publish(msg)
+            if output.startswith("can_relay_fromvic,citadel") or output.startswith(
+                "can_relay_fromvic,digit"
+            ):  # digit for SHT sensor
+                self.bio_pub.publish(msg)
+            return
 
     def on_mock_fromvic(self, msg: String):
         """For testing without an actual MCU, publish strings here as if they came from an MCU"""
@@ -360,6 +309,6 @@ def main(args=None):
 
 if __name__ == "__main__":
     signal.signal(
-        signal.SIGTERM, lambda signum, frame: sys.exit(0)
+        signal.SIGTERM, lambda signum, frame: exit(0)
     )  # Catch termination signals and exit cleanly
     main()

src/core_pkg/core_pkg/core_ptz.py

@@ -1,24 +1,25 @@
 #!/usr/bin/env python3
-import rclpy
-from rclpy.node import Node
 import asyncio
-from concurrent.futures import ThreadPoolExecutor
 import signal
 import sys
 import threading
 import time
+from concurrent.futures import ThreadPoolExecutor
 
+import rclpy
+from rclpy.node import Node
 from std_msgs.msg import String
+
 from astra_msgs.msg import PtzControl, PtzFeedback
 
 # Import the SIYI SDK
 from core_pkg.siyi_sdk import (
-    SiyiGimbalCamera,
-    CommandID,
-    DataStreamType,
-    DataStreamFrequency,
-    SingleAxis,
     AttitudeData,
+    CommandID,
+    DataStreamFrequency,
+    DataStreamType,
+    SingleAxis,
+    SiyiGimbalCamera,
 )
 
 
@@ -262,7 +263,7 @@ class PtzNode(Node):
             f"[{self.get_clock().now().nanoseconds / 1e9:.2f}] PTZ Node: {message_text}"
         )
         self.debug_pub.publish(msg)
-        self.get_logger().info(message_text)
+        self.get_logger().debug(message_text)
 
     def run_async_func(self, coro):
         """Run an async function in the event loop."""