ESP32-DLNA

This is a lightweight version of SoapESP32, yellobyte's outstanding and complex library. There are only basic functions here that are absolutely necessary for a DLNA client. The DLNA media servers behave differently. Therefore I don't know whether every media server works with this library. I tested:

• miniDLNA on Linux
• DLNAServer on Android
• integrated DLNA server of a WiFiRouter (Fritzbox 7490)

Given the amount of data that can arise from a query, the use of an ESP32 with PSRAM is recommended. For convenience in connection with a web server, the queried data can be output in JSON format. An additional JSON library is not required. The JSON string, like the query, is of course preferably created in PSRAM.

Example:

#include "Arduino.h"
#include "WiFiMulti.h"
#include "DLNAClient.h"

DLNA_Client dlna;

WiFiMulti wifiMulti;
String ssid =     "*****;
String password = "****";

bool f_seek   = false;
bool f_browse = false;

void setup(){
    Serial.begin(115200);
    Serial.print("\n\n");

    WiFi.mode(WIFI_STA);
    wifiMulti.addAP(ssid.c_str(), password.c_str());
    while (WiFi.status() != WL_CONNECTED){
        WiFi.disconnect(true);
        wifiMulti.run();
        vTaskDelay(800);
    }
    Serial.println("WiFi connected\n");
    f_seek = true;
}

void loop(){
    dlna.loop();

    if(f_seek){
        dlna.seekServer();
        f_seek = false;
    }

    if(f_browse){
        dlna.browseServer(0, "0"); // objectId "0" is root
        f_browse = false;
    }
}
// --------------------------------------------------------------------------------------------------
void getserver(){  // example: read server items
    DLNA_Client::dlnaServer_t srv = dlna.getServer();
    for(int i = 0; i< srv.size; i++){
        Serial.printf("[%i] %s\n", i, srv.controlURL[i]);
    }
    Serial.println();
}

void getBrowseContent(){ // example: read some content after browsing
    DLNA_Client::srvContent srvCt = dlna.getBrowseResult();
    for(int i = 0; i< srvCt.size; i++){
        Serial.printf("[%i] %s\n", i, srvCt.title[i]);
    }
    Serial.println();
}

//--------------EVENTS--------------------------------------------------------------------------------
void dlna_info(const char* info){
    Serial.printf("dlna_info: %s\n", info);
}

void dlna_server(uint8_t serverId, const char* IP_addr, uint16_t port, const char* friendlyName, const char* controlURL){
    Serial.printf("id %i, name: %s, IP %s:%i\n", serverId, friendlyName, IP_addr, port);
}

void dlna_seekReady(uint8_t numberOfServer){
    Serial.printf("%i media servers found\n\n", numberOfServer);
    f_browse = true;
    Serial.printf("%s\n\n", dlna.stringifyServer()); // and now stringify the found servers, make JSONstring:
}

void dlna_browseResult(const char* objectId, const char* parentId, uint16_t childCount, const char* title, bool isAudio, uint32_t itemSize, const char* itemURL){
    Serial.printf("objectId %s, parentId %s, childCount %i, title %s, isAudio %i, itemSize %i, itemURL %s\n", objectId, parentId, childCount, title, isAudio, itemSize, itemURL);
}

void dlna_browseReady(uint16_t numbertReturned, uint16_t totalMatches){
    Serial.printf("returned %i from %i\n", numbertReturned, totalMatches);
    Serial.printf("\n%s\n\n", dlna.stringifyContent()); // and now stringify the browse result, make JSONstring:
    getserver();
    getBrowseContent();
}