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--- app-notes:set-fixed-frame [2026/09/30 10:55] – [3. Additional information] gray
+++ app-notes:set-fixed-frame [2026/09/30 15:05] (current) – [3. Additional information] gray
@@ Line 142: / Line 142: @@
 ~ $ vi /etc/lxc/guest0/config
-# Setting up a USB flash drive in the LXC container
+# Setting up a USB drive in the LXC container
 lxc.cgroup.devices.allow = c 188:1 rwm
 lxc.mount.entry = /dev/ttyUSB1 dev/ttyUSB1 none bind,optional,create=file 0 0
@@ Line 156: / Line 156: @@
 <konsole>
 ~ $ lxc-attach guest0
-root@LXCNAME:~# apt install gpsd python3-gpsapt gpsd-clients python3-paramiko nano
+root@LXCNAME:~# apt install gpsd python3-gps gpsd-clients python3-paramiko nano
 root@LXCNAME:~#
 </konsole>
@@ Line 359: / Line 359: @@
 <konsole>
 root@LXCNAME:~/ubx_neo_m8l# python3 ssh_start.py 10
-Setze gpsd.0.status=0 ...
+Setze gpsd.1.status=0 ...
-Versuch 1/2: rufe set_cfg_rate_neom8l.py auf...
+Versuch 1/2: call set_cfg_rate_neom8l.py on...
 STDOUT:
 STDERR: 2026-09-30 10:39:20,427 INFO     instantiating GnssUBlox on tty
@@ Line 368: / Line 368: @@
 root@LXCNAME:~/ubx_neo_m8l#
 </konsole>
+Then test the whole thing with a get script.
+<konsole>
+root@LXCNAME:~/ubx_neo_m8l# python3 get_cfg_rate_neom8l.py
+-09-30 11:53:44,917 INFO     instantiating GnssUBlox on tty
+-09-30 11:53:44,917 INFO     using device /dev/ttyUSB1
+UBX-CFG-RATE cls:06 id:08
+  measRate: 100
+  navRate: 1
+  timeRef: 0
+root@LXCNAME:~/ubx_neo_m8l#
+</konsole>
 ----
@@ Line 397: / Line 411: @@
     rate_hz = int(sys.argv[1])
     if not (1 <= rate_hz <= 10):
-        raise ValueError
+        raise ValueErro
 except ValueError:
     print("Error: frame interval must be an integer between 1 and 10")
@@ Line 421: / Line 435: @@
 </code>
 ++++
+----
+Download the ''ssh_start.py'' python script:
+++++show code|
+<code – ssh_start.py>
+#!/usr/bin/python3
+"""
+Establish an SSH connection (key-based) to the router, briefly disable gpsd
+(wwanmd toggles the port from down to up, leaving it briefly free), and within that window
+call set_cfg_rate_neom8l.py with the desired rate_hz value, and then
+re-enable gpsd.
+Calling the subroutine:
+python3 run_set_rate.py <rate_hz>
+"""
+import paramiko
+import subprocess
+import time
+import sys
+HOST = "192.168.1.1"                  # The router's IP address as seen from the container
+PORT = 22
+USER = "root"
+SSH_KEY_PATH = "/root/.ssh/id_rsa"    # Path to the private SSH key
+RETRY_COUNT = 2                       # attempts
+RETRY_DELAY = 0.5                     # Seconds between attempts
+def run_remote_command(client, cmd):
+    stdin, stdout, stderr = client.exec_command(cmd)
+    out = stdout.read().decode().strip()
+    err = stderr.read().decode().strip()
+    status = stdout.channel.recv_exit_status()
+    return status, out, err
+def main():
+    if len(sys.argv) != 2:
+        print(f"Usage: {sys.argv[0]} <rate_hz>   (allowed: 1-10)")
+        sys.exit(1)
+    try:
+        rate_hz = int(sys.argv[1])
+        if not (1 <= rate_hz <= 10):
+            raise ValueError
+    except ValueError:
+        print("Error: rate_hz must be an integer between 1 and 10.")
+        sys.exit(1)
+    # Establish an SSH Connection to the Router ''Key-Based''
+    key = paramiko.RSAKey.from_private_key_file(SSH_KEY_PATH)
+    client = paramiko.SSHClient()
+    client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
+    client.connect(HOST, port=PORT, username=USER, pkey=key, timeout=10)
+    try:
+        # Disable gpsd -> wwanmd toggles the port; it is open for a short time
+        print("Set gpsd.1.status=0 ...")
+        run_remote_command(client, 'cli set -s gpsd.1.status="0"')
+        success = False
+        for attempt in range(1, RETRY_COUNT + 1):
+            print(f"Experiment {attempt}/{RETRY_COUNT}: call set_cfg_rate_neom8l.py on...")
+            result = subprocess.run(
+                ["python3", "set_cfg_rate_neom8l.py", str(rate_hz)],
+                capture_output=True, text=True, timeout=10
+            )
+            print("STDOUT:", result.stdout)
+            if result.stderr:
+                print("STDERR:", result.stderr)
+            if result.returncode == 0 and "SerialException" not in result.stderr:
+                success = True
+                break
+            time.sleep(RETRY_DELAY)
+        if not success:
+            print("Note: set_cfg_rate_neom8l.py failed to run successfully in all attempts.")
+    finally:
+        # Turn gpsd back on
+        print("Set gpsd.0.status=1 ...")
+        run_remote_command(client, 'cli set -s gpsd.1.status="1"')
+        client.close()
+if __name__ == "__main__":
+    main()
+</code>
+++++
+----
+Download the library ''ubxlib'':
+Program library ''ubxlib'' for the Python script / [[https://files.netmodule.com/share/JoIjsXPj|Link]]
+The password for downloading the library : ''gnss_cfg_rate''
+----
+Download the ''get_cfg_rate_neom8l.py'' python script:
+++++show code|
+<code – get_cfg_rate_neom8l.py>
+#!/usr/bin/python3
+"""
+Retrieves the current UBX-CFG-RATE configuration (navigation rate) from the module
+"""
+import logging
+from ubxlib.server_tty import GnssUBlox
+from ubxlib.ubx_cfg_rate import UbxCfgRatePoll
+FORMAT = '%(asctime)-15s %(levelname)-8s %(message)s'
+logging.basicConfig(format=FORMAT)
+logger = logging.getLogger('ubxlib')
+logger.setLevel(logging.INFO)
+ubx = GnssUBlox('/dev/ttyUSB1')
+ubx.setup()
+poll_msg = UbxCfgRatePoll()
+response = ubx.poll(poll_msg)
+print(response)
+ubx.cleanup()
+</code>
+++++
+----

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