W5500 connected() not dynamically changing about arduino-pico

[maxgerhardt]

Addendum: This actually also fails when not giving the interrupt pin in the constructor (i.e. polling mode).

[earlephilhower]

This is expected behavior. Ethernet PHY status is via isLinked(), not connected() which is only looking at IP addressing. It's done this way mostly for backward compatibility. If you try:

void loop() {
  Serial.println("Ethernet connected: " + String(eth.connected()) + " isLinked:" + String(eth.isLinked()));
  Serial.print("IP address: ");
  Serial.println(eth.localIP());
  delay(1000);
}

You'll see something like

15:30:16.874 -> Starting Ethernet port
15:30:16.874 -> Ethernet connected: 0 isLinked:1
15:30:16.874 -> IP address: (IP unset)
15:30:17.866 -> Ethernet connected: 1 isLinked:1
15:30:17.866 -> IP address: 192.168.1.229
15:30:18.859 -> Ethernet connected: 1 isLinked:1
15:30:18.859 -> IP address: 192.168.1.229
15:30:19.885 -> Ethernet connected: 1 isLinked:1
15:30:19.885 -> IP address: 192.168.1.229
15:30:20.877 -> Ethernet connected: 1 isLinked:1
15:30:20.877 -> IP address: 192.168.1.229
15:30:21.871 -> Ethernet connected: 1 isLinked:0
15:30:21.871 -> IP address: 192.168.1.229
15:30:22.863 -> Ethernet connected: 1 isLinked:0
15:30:22.863 -> IP address: 192.168.1.229
15:30:23.889 -> Ethernet connected: 1 isLinked:0
15:30:23.889 -> IP address: 192.168.1.229
15:30:24.882 -> Ethernet connected: 1 isLinked:0
15:30:24.882 -> IP address: 192.168.1.229
15:30:25.875 -> Ethernet connected: 1 isLinked:0
15:30:25.875 -> IP address: 192.168.1.229
15:30:26.867 -> Ethernet connected: 1 isLinked:0
15:30:26.867 -> IP address: 192.168.1.229
15:30:27.860 -> Ethernet connected: 1 isLinked:1
15:30:27.893 -> IP address: 192.168.1.229
15:30:28.886 -> Ethernet connected: 1 isLinked:1
15:30:28.886 -> IP address: 192.168.1.229

It may be worthwhile to && isLinked into the connected() logic, though...thoughts?

[earlephilhower]

Oh, and the W5100 does not report PHY state, or at least the driver here doesn't know how to get that bit of info.

[maxgerhardt]

Hmm then it was a API misunderstanding of mine. The connected() and isLinked functions are properly documented, in my IDE's mousehover.