I made an application that read modbus RS485(using RENFELL RS485 2W) and send to server by MQTT. Everything work fine and after running continuously about 3 or 4 weeks(sometime over a month), it disconnected and found my application was try to reconnect but it fail. And stop my application and try to use cm data connect in terminal. but didn’t work at all.
But after restart device, everything work fine as normal.
But at develop time, I had tested that took off antenna and put it back to reconnect 4g LTE and didn’t have a problem. It was work as expected. And this is fourth time happen. Any suggestion to cover that problem?