Modbus TCP Server vía UCI command - RUT200

NETWORKING SOLUTIONS
1

Hello everyone,

I’m having issues using UCI commands to configure the Modbus TCP server on the RUT200. I successfully completed this process once without errors, but now I can’t replicate it.

These are the UCI commands I’ve used so far:

"opkg update",
"opkg install modbus_server",
"uci set modbus_server.modbus.enabled='1'",
"uci set modbus_server.modbus.timeout='5'",
"uci commit modbus_server"

Then, I reboot the device. I’m not sure if the last command (commit) is required, but it shouldn’t be a problem either.

The issue is that I also need to enable remote access. According to this forum post, I should use the following command:

uci set firewall.20.enabled='1'

However, I get an error because that rule doesn’t exist, even though it should. Also, when listing the UCI configuration, I get:

~ uci show modbus_server                                                                  
modbus_server.modbus=modbus                                                                            
modbus_server.modbus.keepconn='1'                                                                      
modbus_server.modbus.enabled='1'                                                                       
modbus_server.modbus.timeout='5'

Previously, I used to get:

image
image484×196 8.22 KB

So, I suspect something is not being configured correctly, but I’m not sure what.

If I access the WebUI, go to Services > Modbus > Modbus TCP Server, and click Save and Apply, all the missing UCI commands appear. However, I need a solution using only UCI commands (if possible).

Thanks in advance!

2

Hello,

The rule you have used to enable remote access is device specific the value 20 is probably wrong in your case.
Try instead:

uci set firewall.$(uci show firewall | grep Enable_MODBUSD_WAN|cut -d '.' -f 2).enabled='1'

if you need to do it via a script or just set “Allow remote access” in the UI at Services->Modbus->Modbus TCP server.

Regards,

3

Hello,

Yes, I noticed that the number is not important (I used 21 before). The issue is that the rule doesn’t exist, and some configurations of modbus_server are also missing from the uci command list.

Doing it on the WebUI doesn’t solve the problem for me since the devices connected to the router don’t have a GUI.

Regards,