Now i can do ssh from pi5 to ubuntu-laptop on 192.168.1.145 even when i disconnected form wifi on ubuntu-laptop.
root@lp-arm-5:~# ssh root@192.168.1.145
root@192.168.1.145's password:
Welcome to Ubuntu 24.04.2 LTS (GNU/Linux 6.17.0-14-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/pro
Expanded Security Maintenance for Applications is not enabled.
376 updates can be applied immediately.
364 of these updates are standard security updates.
To see these additional updates run: apt list --upgradable
89 additional security updates can be applied with ESM Apps.
Learn more about enabling ESM Apps service at https://ubuntu.com/esm
Last login: Sat Jul 25 18:59:08 2026 from 192.168.10.118
#include <WiFi.h>
const char *ssid = "wifi";
const char *password = "pass";
// GPS UART
HardwareSerial GPS(2); // UART2
// Standard NMEA TCP port
WiFiServer server(10110);
// Allow multiple clients
WiFiClient clients[5];
String line;
void setup() {
Serial.begin(115200);
// GPS on GPIO21 (RX), GPIO22 (TX)
GPS.begin(9600, SERIAL_8N1, 21, 22);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
Serial.print("Connecting");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
Serial.print("Connected: ");
Serial.println(WiFi.localIP());
server.begin();
server.setNoDelay(true);
Serial.println("NMEA TCP server started on port 10110");
}
void loop() {
// Accept new clients
if (server.hasClient()) {
for (int i = 0; i < 5; i++) {
if (!clients[i] || !clients[i].connected()) {
if (clients[i])
clients[i].stop();
clients[i] = server.available();
clients[i].setNoDelay(true);
Serial.printf("Client %d connected\n", i);
break;
}
}
// No room
WiFiClient reject = server.available();
reject.stop();
}
// Read GPS
while (GPS.available()) {
char c = GPS.read();
// Echo to USB serial
Serial.write(c);
line += c;
if (c == '\n') {
// Send complete NMEA sentence to all clients
for (int i = 0; i < 5; i++) {
if (clients[i] && clients[i].connected()) {
clients[i].print(line);
if (clients[i].getWriteError()) {
clients[i].stop();
}
}
}
line.clear();
// Prevent runaway if malformed data
if (line.length() > 256)
line.clear();
}
}
}
xgps to view data
apt install gpsd gpsd-clients
nc ESP-IP 10110
#OR
gpsd tcp://192.168.1.150:10110
#lauch
xgps
#or
sudo systemctl stop gpsd.socket gpsd
gpsd -N -n -D 5 tcp://192.168.10.196:10110
gpspipe -r
#lauch
xgps
#check time of laptop
home@home:~$ ntpdate -q 192.168.10.196
2026-07-28 17:58:10.0 (+0530) -1.950956 +/- 0.001631 192.168.10.196 s1 no-leap
Your computer's clock is about -1.950956 seconds ahead of the GPS-based NTP server. To match the GPS time, your clock would need to move backward by about -1.950956 seconds.
systemctl enable --now chrony
@home: timedatectl
Local time: Tue 2026-07-28 18:09:42 IST
Universal time: Tue 2026-07-28 12:39:42 UTC
RTC time: Tue 2026-07-28 12:39:42
Time zone: Asia/Kolkata (IST, +0530)
System clock synchronized: yes
NTP service: active
RTC in local TZ: no
@home:~$ chronyc tracking
Reference ID : 41007738 (ec2-65-0-119-56.ap-south-1.compute.amazonaws.com)
Stratum : 5
Ref time (UTC) : Tue Jul 28 12:41:44 2026
System time : 0.000236698 seconds fast of NTP time
Last offset : +0.000414969 seconds
RMS offset : 0.000378138 seconds
Frequency : 14.685 ppm fast
Residual freq : +1.339 ppm
Skew : 21.187 ppm
Root delay : 0.010673190 seconds
Root dispersion : 0.000975857 seconds
Update interval : 64.2 seconds
Leap status : Normal
chronyc sources -v
This means the ESPHome API decided to reboot because no API client (typically Home Assistant or the ESPHome dashboard) was connected for the configured timeout.
By default, if you’re using the api: component, ESPHome can reboot after a period without an API connection.
