client-examples | Examples of how to connect to Polygon.io | Business library

You're using the wrong port number.

Port 80 is for unencrypted HTTP.

Port 443 is for HTTPS.

You're using WiFiClientSecure, so presumably you're intending to use HTTPS. HTTPS runs on port 443, not port 80. You'll need to change your code to use 443, or you'll need to use WiFiClient in order to work with port 80 (but make sure the API you're trying to connect to allows access over plain HTTP - most will not).

I highly recommend that you use an existing HTTP client rather than implement the protocol yourself as you'll need to with WiFiClient or WiFiClientSecure, which just provide TCP and encrypted TCP connections. You can find examples of how to use ESP8266HTTPClient in the ESP8266 Arduino core repository.

UaExpert is doing more bookkeeping than you are doing. You should have knowledge of which Nodes you have created MonitoredItems for and be able to get the BrowseName or DisplayName attribute from those Nodes.

Inside that callback you have access to the NodeId - that should be your key to get to the Node and any attributes you are interested in.

First of all, you cannot cast array of objects like that. Instead, you could use the stream API to construct Floats like this:

Assuming that you are running Hono on a local minikube cluster with minikube tunnel running, you can determine the IP address and port of Hono's northbound API as follows (replace hono with the namespace that you have installed Hono to):

The issue is how new lines are printed on Windows and Mac, Windows treats new lines as 2 characters, CR - Carriage return ("\r") + LF- Line feed ("\n") "\r\n", Mac prints new lines as LF("\n") only. HTTP requests expects each line to be separated by CRLF "\r\n", what your code is printing is just "\n" on Mac and "\r\n" on Windows that is why it works as expected on Windows platform.

To make it work on both Windows and Mac try the following code: