LAN IP in Mqtt Server does not connect.

[ajaybnl]

Description of the problem

My Mqtt Server is hosted on Raspberry Pi, when i set '192.168.100.x' as mqtt server, the client never connects to the mqtt server.

Versions

• ESPMQTTClient lib: 1.13.3
• PubSubClient lib: 2.8
• Arduino ESP32 / ESP8622 core: 3.20011.230801

Hardware

• Board type : ESP32 Wroom
• Board model : Custom

Logs

DNS Error

Correction

Add this code to detect and use ip or domain name

if(isip(_mqttServerIp)){
_mqttClient.setServer(_mqttServerIp, _mqttServerPort);
}else{
const char* mqtt_ip = MDNS.queryHost(_mqttServerIp).toString().c_str();

_mqttClient.setServer(mqtt_ip, _mqttServerPort);
}

add this function

bool isip(const String& input) {
int dotCount = 0;

for (size_t i = 0; i < input.length(); i++) {
char c = input[i];
if (c == '.') {
dotCount++;
} else if (!isDigit(c)) {
return false; // Contains a non-digit character other than '.'
}
}

// Must have exactly 3 dots to be an IP address
return (dotCount == 3);
}