I need to run a command on a remote host from a Python 3 script. I have tried several methods, but I cannot get any of them working. I tried using paramiko but pip fails when attempting to load the bcrypt module from the cryptography library. Apparently there is a missing equals sign according to the Python exception when running pip3 install paramiko. I tried using pxssh from pexpect, but it raises an exception when I try to login saying it cannot establish a connection to the host. It does this whether I try the remote host or localhost #! /usr/bin/python3 from pexpect import pxssh ssh = pxssh.pxssh() if not ssh.login("192.168.1.34", "xxxxxxx", "yyyyyyyy"): print("Failed") I tried the following code: #! /usr/bin/python3 import time, subprocess, sys IP = "192.168.1.34" with open ("/var/run/thermostat/insideT", "r") as infile: Temp = float(infile.read()) # Get inside temperature if Temp > 75: TString = IP + '"/usr/bin/gpio write 0 1"\n subprocess.run(["ssh", TString]) But I get an error from ssh saying it cannot resolve the hostname 192.168.1.34. I have tried several different variations on the subprocess call. ssh 192.168.1.34 "gpio write 0 1" works just fine. Another way to handle this would be to read the value of the /var/run/thermostat/insideT on the local system from the remote system if that would be easier. I can run the script from either system. Both hosts are Raspberry Pi systems running a recent version of Raspberry Pi OS. Note I have a passwordless login enabled for ssh between the systems. Continue reading...
