ArduinoOTA in different subnet

ElCaron · November 13, 2017, 7:21pm

I have ESP8266 nodes in different subnets that I am not part of myself (IoT VLAN, other sites connected by VPN). Is there a way to tell the Arduino IDE an IP explicitly, instead of relying on autodetection (Zeroconf?).

6v6gt · November 13, 2017, 10:32pm

It appears that you want to define an IP address (static address) for your ESP8266 instead of accepting a DHCP supplied one (dynamic address).

I'm not sure how current this, but it appears not to be too hopeful:

http://www.esp8266.com/viewtopic.php?f=6&t=489

But, then again, this appears to have a solution (see comment Apr 21, 2016):

github.com/esp8266/Arduino

Fixed IP with ESP8266WiFi

opened 04:14PM - 21 Apr 16 UTC

closed 04:42AM - 22 Apr 16 UTC

SamirTafesh

Hello, i am building a Relay controller via ESP8266Wifi, every thing works fine… with no problem, but the issue is that every time i restart the ESP, a new IP address is assigned, i would like to know if it is possible to fix an IP address from the code and not from the router the Code is /* - This sketch demonstrates how to set up a simple HTTP-like server. - The server will set a GPIO pin depending on the request - http://server_ip/gpio/0 will set the GPIO2 low, - http://server_ip/gpio/1 will set the GPIO2 high - server_ip is the IP address of the ESP8266 module, will be - printed to Serial when the module is connected. */ # include ESP8266WiFi.h const char\* ssid = "BOSS-HOME"; const char\* password = "9876543210"; // the IP address for the shield: IPAddress ip(192, 168, 1, 177); // Create an instance of the server // specify the port to listen on as an argument WiFiServer server(80); void setup() { Serial.begin(115200); delay(10); // prepare GPIO2 pinMode(2, OUTPUT); digitalWrite(2, HIGH); pinMode(0, OUTPUT); digitalWrite(0, HIGH); // Connect to WiFi network Serial.println(); Serial.println(); Serial.print("Connecting to "); Serial.println(ssid); //WiFi.config(ip); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); } Serial.println(""); Serial.println("WiFi connected"); // Start the server server.begin(); Serial.println("Server started"); // Print the IP address Serial.println(WiFi.localIP()); } void loop() { // Check if a client has connected WiFiClient client = server.available(); if (!client) { return; } // Wait until the client sends some data Serial.println("new client"); while(!client.available()){ delay(1); } // Read the first line of the request String req = client.readStringUntil('\r'); Serial.println(req); client.flush(); // Match the request int val; if (req.indexOf("/gpio/0") != -1) digitalWrite(2, LOW); else if (req.indexOf("/gpio/1") != -1) digitalWrite(2,HIGH); else { Serial.println("invalid request"); client.stop(); return; } // Set GPIO2 according to the request //digitalWrite(2, val); client.flush(); // Prepare the response String s = "HTTP/1.1 200 OK\r\nContent-Type: text/html\r\n\r\n<!DOCTYPE HTML>\r\n<html>\r\nGPIO is now "; s += (val)?"high":"low"; s += "</html>\n"; // Send the response to the client client.print(s); delay(1); Serial.println("Client disonnected"); // The client will actually be disconnected // when the function returns and 'client' object is detroyed }

ElCaron · November 14, 2017, 6:04am

Not at all what I want to do. A static IP address is a good idea for that, but I already have that via static DHCP entries.

What I want to do is explicitly tell the ArduinoIDE the IP I want to flash to. Usually it autodetects all OTA-capable nodes on the network, but the devices I want to flash are not on the same network (but routed), so they are not detected.

6v6gt · November 14, 2017, 8:42am

Oops. Yes I see now.
I guess the ESP8266, when it is in this "OTA ready" mode, is constantly broadcasting its IP address in the local subnet. This is picked up by the IDE. Broadcasts don't normally work across subnet boundaries.
Probably your only hope is to find a configuration (or do a hack) in the IDE which allows you to explicitly add IP addresses to the list of candidate OTA clients.

ElCaron · November 14, 2017, 9:43am

6v6gt:
Probably your only hope is to find a configuration (or do a hack) in the IDE which allows you to explicitly add IP addresses to the list of candidate OTA clients.

Correct. That configuration or hack is what i am asking for.

As an alternative, I think PlatformIO gives you more control. I find the ArduinoIDE pretty limited anyway and wanted to switch, but the last test wasn't as intuitive as I had hoped for.

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ArduinoOTA in different subnet

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