💾 Arduino_OPC_UA

This library provides an implementation of OPC UA by porting the Fraunhofer open62541 for the Arduino Opta family.

Furthermore, the library supports automatic detection, configuration and exposure of up to two Arduino Opta Expansion Boards (i.e. Digital Expansion w/ mechanical relays D1608E, Digital Expansion w/ solid-state relays D1608S, Analog Expansion A0602) via OPC UA.

How-to-OPC UA

• Compile and upload examples/opta_opcua_server

arduino-cli compile --fqbn arduino:mbed_opta:opta -v examples/opta_opcua_server -u -p /dev/ttyACM0

• Connect Arduino Opta Ethernet port with a DHCP-enabled router, switch, etc.
• Open a serial monitor

$ cat /dev/ttyACM0 
[2024-06-21 02:30:19.000 (UTC+0000)] info/eventloop	Starting the EventLoop
[2024-06-21 02:30:19.000 (UTC+0000)] warn/server	AccessControl: Unconfigured AccessControl. Users have all permissions.
[2024-06-21 02:30:19.000 (UTC+0000)] info/server	AccessControl: Anonymous login is enabled
[2024-06-21 02:30:19.000 (UTC+0000)] warn/server	x509 Certificate Authentication configured, but no encrypting SecurityPolicy. This can leak credentials on the network.
[2024-06-21 02:30:19.000 (UTC+0000)] info/server	Arduino Opta IP: 192.168.8.137
[2024-06-21 02:30:19.000 (UTC+0000)] info/server	Arduino Opta Variant: Arduino Opta WiFi
[2024-06-21 02:30:19.000 (UTC+0000)] info/server	stack: size = 16384 | free = 14936 | used = 1448 | max = 5124
[2024-06-21 02:30:19.000 (UTC+0000)] info/server	o1heap: capacity: 261984 | allocated: 66784 | peak_allocated: 68896
[2024-06-21 02:30:19.000 (UTC+0000)] warn/server	Maximum SecureChannels count not enough for the maximum Sessions count
[2024-06-21 02:30:19.000 (UTC+0000)] info/network	TCP	| Listening on all interfaces
[2024-06-21 02:30:19.000 (UTC+0000)] info/network	TCP 604353888	| Creating listen socket for "127.0.0.1" (with local hostname "192.168.8.137") on port 4840
[2024-06-21 02:30:19.000 (UTC+0000)] info/server	New DiscoveryUrl added: opc.tcp://192.168.8.137:4840

• Connect to OPC UA server using IP/port as printed by the Arduino Opta

How-to-opcua-client-gui

cd /tmp
git clone https://github.com/FreeOpcUa/opcua-client-gui && cd opcua-client-gui
python -m venv .venv
source .venv/bin/activate
python3 -m pip install --upgrade pyopenssl
python3 -m pip install --upgrade .

Developer section

How-to-enable detailed heap/stack memory debugging information

• Edit variants/OPTA/conf/mbed_app.json

"target.macros_add": [
  ...
+  "MBED_HEAP_STATS_ENABLED=1",
+  "MBED_STACK_STATS_ENABLED=1",
+  "MBED_MEM_TRACING_ENABLED=1"

• Recompile libmbed.a

cd ArduinoCore-mbed
./mbed-os-to-arduino -a -g OPTA:OPTA