Hello,
Apologies for the delay.
Could you please clarify what the intended goal of this Lua script is and elaborate on the script a bit more? As this inquiry is outside of my scope, and I’m not that familiar with Lua scripting, I can only provide you with insights/suggestions to check or try. From the code, I assume you are trying to open an RTU connection on /dev/rs485. Can you confirm if the device /dev/rs485 is actually present and visible under /dev?
Additionally, instead of using a custom Lua script, you can also call the Modbus service directly using ubus commands. For example (change parameters according to your requirements):
ubus call modbus_client.rpc serial.test '{"id":1,"timeout":1,"function":4,"first_reg":2,"reg_count":"2","data_type":"16bit_int_hi_first","no_brackets":1,"serial_type":"/dev/rs485","baudrate":19200,"databits":8,"stopbits":1,"parity":"none","flowcontrol":"none"}'
More useful information and examples for Modbus calls via ubus can be found in related forum topics here:
- Ubus call modbus_client not working anymore
- TRB255 modbus serial connection disabled?
- TRB246 get Modbus data from slave
- Sending data to serial modbus using CLI on TRB145
Best regards,