I found this and am using it as my base, but it wasn't working right out of the box. My goal is also to treat it as a package instead of a command line utility, so my code changes will reflect that.
class Netcat:
def __init__(self, hostname, port):
self.hostname = hostname
self.port = port
def send(self, content):
self.socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
self.socket.connect((self.hostname, self.port))
self.socket.setblocking(0)
result = '';
read_ready, write_ready, in_error = select.select([self.socket], [], [self.socket], 5)
if(self.socket.sendall(content) != None):
return
while(1):
buffer = ''
try:
buffer = self.socket.recv(128)
while(buffer != ''):
result += buffer
try:
buffer = self.socket.recv(128)
except socket.error as err:
print (err, type(err))
buffer = ''
if(buffer == ''):
break
except socket.error as err:
print (err, type(err))
if(buffer == ''):
break
return result
When I send a basic command to my device, it returns the following.
50PMA-019 Connection Open
Atten #1 = 63dB
My code reads the first line, but then I get an error saying that the connection is temporarily unavailable and it does not get the second line. If I change it to blocking, it just blocks and never returns. Any thoughts?
Does it work if you just use nc?
I think you should try something a little simpler:
import socket
def netcat(hostname, port, content):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.connect((hostname, port))
s.sendall(content)
s.shutdown(socket.SHUT_WR)
while 1:
data = s.recv(1024)
if len(data) == 0:
break
print("Received:", repr(data))
print("Connection closed.")
s.close()
I added the shutdown call because maybe your device is waiting for you to say you're done sending data. (That would be a little weird, but it's possible.)