Connect Opta PLC to Arduino Cloud with its Ethernet Port

Official Hardware Opta
1

Can I use use a 4G router and connect to ethernet port (instead of Wifi) of the Opta PLC, to allow Opta PLC connect to Arduino cloud?

Thanks!

3

Hello lijp99, I connect the Opta trough a normal ethernet connection. Works very reliably. So, I don't think you will have any issues using a 4G modem with a normal ethernet cable connection.

4

Hi! I am jumping in as I am interested in doing the same.

Are you using any specific library to connect to arduino IoT Cloud using an OPTA through ethernet instead of Wifi? I am not able to find much information about the code itself on the internet.

My project would be either an MKR+Ethernet shield or an OPTA Lite, as when boxed, wired and everything, the MKR cost almost the same as an OPTA Lite.

5

Hello Daniel,

Just configure the OPTA or MKR as being connected using an Ethernet cable.

I assume you are familiar with the Arduino IoT Cloud?

  1. Connect the OPTA or MKR to any working ethernet connection using an ethernet cable;
  2. Connect the OPTA or MKR to the Arduino IoT Cloud as usual;
  3. Connect your G4 modem to the internet;
  4. connect the OPTA or MKR to the G4 modem using an ethernet cable.
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6

Hi!

Did you ever get this working? Using the example sketch I get "ArduinoIoTCloudTCP::handle_ConnectMqttBroker could not connect to iot.arduino.cc:8883 Error: -2" in the monitor.

Thanks

7

Hi @daboombcn ,

On Arduino Cloud, you can configure Opta to connect via Ethernet as shown in the following tutorial:

1 Like
8

Thanks, @Hm_pro.

However, it turns out I just needed to follow the memory partitioning guide https://docs.arduino.cc/tutorials/opta/memory-partitioning/

I didn't realise this was an essential step!

1 Like
9

@daboombcn Perfect, thanks for the update! :slight_smile:

10

I spoke a bit too soon...

It does connect to iot.arduino.cc sometimes but sometimes not! It's very random with absolutely no changes between each attempt. If it fails, I simply tap the reset button to restart the Opta to try again. Sometimes it'll connect and sometimes not. I'm going to check this against my own MQTT server before I can be sure that it's an Arduino Cloud or device authentication problem.