json rest problem

juntiedt

I am trying to run the following code. Unfortunately no success.
Apppreciate very much your support.

Hannes

import http.client

payload = "{\"value\" : \"1\"}"
headers = {'content-type': "application/json"}

conn = http.client.HTTPConnection("localhost:8080")
conn.request("POST", "/json/relay/%7B5%7D", payload, headers)
response = conn.getresponse()
print(response.status, response.reason)
data = response.read()
conn.close()

print(data)

Error report:

Traceback (most recent call last):
  File "/home/pi/json_rest_0.py", line 7, in <module>
    conn.request("POST", "/json/relay/%7B5%7D", payload, headers)
  File "/usr/lib/python3.5/http/client.py", line 1107, in request
    self._send_request(method, url, body, headers)
  File "/usr/lib/python3.5/http/client.py", line 1152, in _send_request
    self.endheaders(body)
  File "/usr/lib/python3.5/http/client.py", line 1103, in endheaders
    self._send_output(message_body)
  File "/usr/lib/python3.5/http/client.py", line 934, in _send_output
    self.send(msg)
  File "/usr/lib/python3.5/http/client.py", line 877, in send
    self.connect()
  File "/usr/lib/python3.5/http/client.py", line 849, in connect
    (self.host,self.port), self.timeout, self.source_address)
  File "/usr/lib/python3.5/socket.py", line 712, in create_connection
    raise err
  File "/usr/lib/python3.5/socket.py", line 703, in create_connection
    sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

tomas_hora

@juntiedt Try it with:

conn.request("POST", "/json/relay/5", payload, headers)

and according to the

File "/usr/lib/python3.5/http/client.py", line 849, in connect
  (self.host,self.port), self.timeout, self.source_address)

it seems that the client cannot connect to the server (check the IP address and port) and if evok is running (systemctl status evok).

juntiedt

Hi Tomas,

when I use localhost:8080 I receive the very long error message above. However, when I use localhost:80 and your request I receive the error message below. Does this tell you something?

regards
Hannes

import http.client

payload = "{\"value\":\"1\"}" 
headers = {'content-type':"application/json"}

conn = http.client.HTTPConnection("localhost:80")
conn.request("POST", "/json/relay/5", payload, headers)
response = conn.getresponse()
print(response.status, response.reason)
data = response.read()
print(data)
conn.close()

I get this respones:

404 Not Found
b'<html><title>404: Not Found</title><body>404: Not Found</body></html>'

tomas_hora

@juntiedt Are you sure that evok is running on localhost on port 8080?

juntiedt

evoc is running. I checked it with "systemctl status evok"
I checked "/etc/evoc.conf. port" which was set to 80. Actually I haven't changed anything since installation! Changed it now to 8080.
I am getting the same response as before: 404 Not Found ... see above - but now on port 8080

Is there another file where I should/could change the port to 8080?

does body mean payload and title mean headers?

TomasKnot

This post is deleted!

tomas_hora

@juntiedt After you changed the port in /etc/evok.conf to 8080, did you restart it? I think it should not work, because there is the some webserver running on 8080. Check it with

netstat -putan

juntiedt

is it possible that I have a problem with tornadorpc-evok. I am not sure if it is installed the correct way. please let me know how to install it and where I can find the correct installation file.

regarding your question: no web server running

tomas_hora

@juntiedt Some server is running because it responds with 404... The tornado-rpc evok is part of evok itself. Please try to reinstall evok and paste the output of the installation script

juntiedt

ok, I will reinstall evok.
Wich one would you recommend?
Legacy or Evok 2.0 on my unipi1.1 with stretch

tomas_hora

@juntiedt 2.0

juntiedt

new stretch image, new evok --> all works perfectly!
thanks Tomas

juntiedt

Hi Tomas,
I was too optimistic yesterday. Today I tryed your websocket based sample programm with Python 3. Python can't find websocket. Do I have to install a websocket library? If yes which one?

There is another problem I found when rebooting after installing evok.
During booting raspbian stretch I got this warning message:
"Failed to start load kernel modules"
Could this be the reason why websocket does not work?

I am running plain stretch with latest update and upgrade

juntiedt

system Status:

● systemd-modules-load.service - Load Kernel Modules
   Loaded: loaded (/lib/systemd/system/systemd-modules-load.service; static; vendor preset: enabled)
   Active: failed (Result: exit-code) since Fri 2017-11-17 12:50:58 CET; 2min 17s ago
     Docs: man:systemd-modules-load.service(8)
           man:modules-load.d(5)
  Process: 126 ExecStart=/lib/systemd/systemd-modules-load (code=exited, status=1/FAILURE)
 Main PID: 126 (code=exited, status=1/FAILURE)

Nov 17 12:50:58 raspberrypi systemd-modules-load[126]: Inserted module 'i2c_dev'
Nov 17 12:50:58 raspberrypi systemd-modules-load[126]: Inserted module 'i2c_bcm2708'
Nov 17 12:50:58 raspberrypi systemd-modules-load[126]: Error running install command for unipi_eprom
Nov 17 12:50:58 raspberrypi systemd-modules-load[126]: Failed to insert 'unipi_eprom': No such file or directory
Nov 17 12:50:58 raspberrypi systemd-modules-load[126]: /etc/opt/unipi_eprom: 24: /etc/opt/unipi_eprom: cannot create /sys/class/i2c-dev/i2c-1/device/new_device: Directory none
Nov 17 12:50:58 raspberrypi systemd-modules-load[126]: sh: 1: cannot create /sys/bus/i2c/devices/i2c-1/new_device: Directory nonexistent
Nov 17 12:50:58 raspberrypi systemd[1]: systemd-modules-load.service: Main process exited, code=exited, status=1/FAILURE
Nov 17 12:50:58 raspberrypi systemd[1]: Failed to start Load Kernel Modules.
Nov 17 12:50:58 raspberrypi systemd[1]: systemd-modules-load.service: Unit entered failed state.
Nov 17 12:50:58 raspberrypi systemd[1]: systemd-modules-load.service: Failed with result 'exit-code'.
~

juntiedt

sorry for the websocket issue. Its now running.

the only thing left is the unipi_eprom problem in the boot process of Raspbian