Telnet switch - can't get status

Configuration
1

Hi, I’m trying to control my projector via the telnet switch. The problem is that the status doesn’t update. I can turn the projector ON via HomeAssistant so I know the connections is OK.

This is what I have:
switch:
platform: telnet
switches:
projector:
resource: “10.0.0.36”
port: 23
command_on: “~0000 1”
command_off: “~0000 0”
command_state: “~00124 1”
value_template: ‘{{ value == “OK1” }}’

The logs say: Empty response for command: ~00124 1

I have done telnet to the projector and all three commands work. The return for “~00124 1” is “OK1” when on and “OK0” when off. Why doesn’t Home Assistant get a return?

2

Has anyone used this and can give me some help?

The docs says “If not defined the switch will assume successful state changes.”, but how to I not define something that’s “required”? I don’t need it to check for state, I just need the switch to flip so I can turn it off…

From https://home-assistant.io/components/switch.telnet/ :
command_state (Required): Command to determine the state of the switch. If not defined the switch will assume successful state changes.
value_template (Required): The template evaluating to true will indicate that the switch is on.

3

Were you able to solve this problem. I’m having the exact same issue trying to configure a telnet switch to control an Optoma projector.

4

ended up doing this instead:

5

I’m having the same issue with my Optoma projector.

On my computer shell I tested the telnet command ~00150 1 \r and it correctly returns me the status string. But Home Assistant will show me the same error.

If I find a solution I will post it here

6

In an actual telnet, how long does it take for the answer to come back?
The default timeout before HA assumes “no response” is quite low (200ms)

7

Im having kind of the same problem… Optoma UHD60…
My problem is that when Im using telnet I always get “F” as result the first time… after the initial request, I always get the correct answer:

Escape character is '^]'.
Optoma_PJ> ~00124 1
F
Optoma_PJ> ~00124 1
OK1
Optoma_PJ> ~00124 1
OK1
8

Reply on my own post…
Seems like the Optoma answers with more info than needed… After doing some tcpdump this is what I figured:

Transmission Control Protocol, Src Port: 23, Dst Port: 55035, Seq: 1, Ack: 11, Len: 16 Telnet 
Data: OK1\r\n 
Data: Optoma_PJ>

So a simple solution is:
value_template:
"{{ 'OK1' in value }}"

1 Like
9

This worked perfectly! Thanks!