Offline AI Phone

#include <Arduino.h>
#include <WiFi.h>
#include <WebServer.h>
#include <WiFiUdp.h>
#include <HTTPClient.h>
#include <Preferences.h>
#include <SD.h>
#include "system.h"
#include <BLEDevice.h>
#include <BLEServer.h>
#include <BLEUtils.h>
#include <BLE2902.h>
#include <time.h>
bool passwordEntry();
String securityCommand(String);
#include "chat.h"
WebServer web(80); WiFiUDP udp; Preferences prefs;
String note, inbox="No messages", weather="Weather not fetched", lat="", lon="", zone="UTC0", apName;
char blePending[161]={0}; portMUX_TYPE mux=portMUX_INITIALIZER_UNLOCKED;
BLECharacteristic *tx=nullptr;
unsigned long lastWeather=0, lastMinute=0; bool fsOK=false, weatherDue=false;
const char *serviceUUID="6e400001-b5a3-f393-e0a9-e50e24dcca9e";
String clockText(){time_t n=time(nullptr); if(n<1700000000)return "Clock not synced (internet needed once)";char b[70];struct tm t;localtime_r(&n,&t);strftime(b,sizeof(b),"%a %Y-%m-%d %H:%M",&t);return b;}
void show(String s){answer=s;dirty=true;startNotice();}
void sendMessage(String s){s=s.substring(0,160); if(!s.length())return;String packet="PKT1|"+apName+"|"+s;udp.beginPacket(IPAddress(255,255,255,255),4210);udp.print(packet);udp.endPacket();if(tx){tx->setValue(s.c_str());tx->notify();}inbox="Me: "+s;show("Sent locally (no delivery confirmation): "+s);}
class LinkServer:public BLEServerCallbacks {void onDisconnect(BLEServer *s) override {s->getAdvertising()->start();}};
class Receiver:public BLECharacteristicCallbacks {void onWrite(BLECharacteristic *c) override {auto v=c->getValue();String s(v.c_str());s=s.substring(0,160);portENTER_CRITICAL(&mux);s.toCharArray(blePending,sizeof(blePending));portEXIT_CRITICAL(&mux);}};
#include "transfer.h"
String readPage(String url);
void saveNote(){if(fsOK){File f=SD.open("/data/note.txt","w");if(f){f.print(note);f.close();}}}
String wifiNames[12]; int wifiCount=0, wifiStage=0; bool scanBusy=false;
String chosenSSID;
bool passwordEntry(){return wifiStage==2 || input.startsWith("pin ");}
String networkCommand(String s){
 String t=s;t.trim();String low=t;low.toLowerCase();
 if(low=="cancel"){wifiStage=0;return "Setup cancelled.";}
 if(wifiStage==1){int i=t.toInt()-1;if(i<0||i>=wifiCount)return "Enter a listed network number, or cancel.";chosenSSID=wifiNames[i];wifiStage=2;return "Network: "+chosenSSID+". Enter password (case sensitive), or /open for an open network. Use Aa and #+= keys. Password is hidden.";}
 if(wifiStage==2){String pass=s=="/open"?String(""):s;if(pass.length()&& (pass.length()<8||pass.length()>63))return "Password must be 8-63 characters. Try again or cancel.";prefs.putString("ssid",chosenSSID);prefs.putString("pass",pass);WiFi.disconnect();WiFi.begin(chosenSSID.c_str(),pass.c_str());wifiStage=0;return "Connecting to "+chosenSSID+". Saved for restart. Type status to check. If connection fails, type wifi to try again.";}
 if(low=="wifi")return "Standalone settings: wifi scan | wifi name YOUR NETWORK | wifi forget | location LAT,LON | timezone POSIX_RULE | time | weather | status. Aa switches case; #+= switches symbols. No phone needed. Internet still needs a 2.4 GHz router/hotspot.";
 if(low=="wifi scan"){if(scanBusy)return "Scan in progress...";WiFi.scanDelete();WiFi.scanNetworks(true);scanBusy=true;return "Scanning 2.4 GHz networks... Results will appear here. Then enter the network number.";}
 if(low.startsWith("wifi name ")){chosenSSID=s.substring(10);if(!chosenSSID.length()||chosenSSID.length()>32)return "Network name must be 1-32 bytes.";wifiStage=2;return "Enter Wi-Fi password, or /open. Password hidden. Use Aa and #+= keys.";}
 if(low=="wifi forget"){wifiStage=0;prefs.remove("ssid");prefs.remove("pass");WiFi.disconnect();return "Saved Wi-Fi removed. Type wifi scan to reconnect.";}
 if(low.startsWith("location ")){String v=t.substring(9);int comma=v.indexOf(',');if(comma<1)return "Use location LAT,LON, for example location 50.85,4.35";String a=v.substring(0,comma),b=v.substring(comma+1);char *end;double x=strtod(a.c_str(),&end);if(*end||x<-90||x>90)return "Invalid latitude.";double y=strtod(b.c_str(),&end);if(*end||!b.length()||y<-180||y>180)return "Invalid longitude.";lat=String(x,5);lon=String(y,5);prefs.putString("lat",lat);prefs.putString("lon",lon);weatherDue=true;return "Weather location saved.";}
 if(low.startsWith("timezone ")){zone=t.substring(9);if(zone.length()>80)return "Timezone too long.";prefs.putString("tz",zone);configTzTime(zone.c_str(),"pool.ntp.org","time.google.com");return "Timezone saved. UTC: UTC0. Belgium: CET-1CEST,M3.5.0,M10.5.0/3";}
 return "";
}
void networkTick(){if(!scanBusy)return;int n=WiFi.scanComplete();if(n==WIFI_SCAN_RUNNING)return;scanBusy=false;wifiCount=0;String result="Select network number: ";for(int i=0;i<n&&wifiCount<12;i++){String ss=WiFi.SSID(i);if(!ss.length())continue;bool duplicate=false;for(int j=0;j<wifiCount;j++)if(wifiNames[j]==ss)duplicate=true;if(duplicate)continue;wifiNames[wifiCount++]=ss;result+=String(wifiCount)+":"+ss+" | ";}WiFi.scanDelete();wifiStage=wifiCount?1:0;show(wifiCount?result:String("No networks found. Try wifi scan again or wifi name YOUR NETWORK. 2.4 GHz only."));}
String appCommand(String);
String organizerCommand(String);
String reply(String s){if(!wifiStage){String a=organizerCommand(s);if(a.length())return a;a=appCommand(s);if(a.length())return a;}String sec=securityCommand(s);if(sec.length())return sec;String sys=systemCommand(s);if(sys.length())return sys;String local=networkCommand(s);if(local.length())return local;String t=s;t.trim();t.toLowerCase();
 if(t=="help"||t=="home")return "Commands: wifi, settings, wifi scan, charge demo, files, music, browser, browse URL, time, weather, status, note TEXT, notes, msg TEXT, inbox, timer SECONDS, help. Configure on this screen: type settings. Optional web file tools: open http://192.168.4.1 while on "+apName+" (password pocket1234). Chat is rule-based, not an LLM.";
 if(t.startsWith("browse "))return readPage(s.substring(7));
 if(t=="music"||t=="browser")return "Open http://192.168.4.1/tools on your phone. Streaming audio plays on your phone, not this board. Reader: browse http://example.com (HTTP text only).";
 if(t=="charge demo"){chargeDemoUntil=millis()+10000;return "Charging animation DEMO for 10 seconds. No battery sensor or charging status is available.";}
 if(t=="files")return "SD /data: Bluetooth and downloaded files, max 256 KiB each. /apps accepts text cards only; use apps or app NAME.txt. No executable app installation or music playback.";
 if(t=="time"||t=="date")return clockText();
 if(t=="status")return apName+" | Wi-Fi: "+(WiFi.status()==WL_CONNECTED?WiFi.localIP().toString():String("not connected"))+" | BLE: PocketLink text only, NOT headphone audio. Files: "+(fsOK?String(SD.usedBytes())+"/"+String(SD.totalBytes()):String("unavailable"));
 if(t=="weather"){weatherDue=true;return weather+" | Will refresh if internet and location are configured.";}
 if(t.startsWith("note ")){note=s.substring(5,505);saveNote();return "Note saved.";}
 if(t=="notes")return note.length()?note:String("No note saved. Type note then your text.");
 if(t.startsWith("msg ")){sendMessage(s.substring(4));return answer;}
 if(t=="inbox")return inbox;
 if(t.startsWith("timer ")){extern unsigned long alertDeadline;int n=t.substring(6).toInt();if(n<1||n>86400)return "Timer: enter 1 to 86400 seconds.";alertDeadline=millis()+n*1000UL;return "Visual timer started.";}
 return botReply(s);
}
unsigned long alertDeadline=0;
String htmlEscape(String s){s.replace("&","&amp;");s.replace("<","&lt;");s.replace(">","&gt;");s.replace("\"","&quot;");return s;}
void page(){String p="<!doctype html><meta name=viewport content='width=device-width'><title>Pocket OS</title><h1>Pocket OS</h1><p><a href=/drop>PocketDrop file sharing</a></p><p><a href=/tools>Neon tools: live music and web reader</a></p><p>"+htmlEscape(clockText())+"</p><p>"+htmlEscape(weather)+"</p><p>Last message: "+htmlEscape(inbox)+"</p>";
 p+="<h2>Wi-Fi and weather</h2><form method=post action=/config>Network name <input name=ssid maxlength=32><br>Password <input name=pass type=password maxlength=63><br>Latitude <input name=lat value='"+htmlEscape(lat)+"'><br>Longitude <input name=lon value='"+htmlEscape(lon)+"'><br>POSIX timezone <input name=tz value='"+htmlEscape(zone)+"'><p>UTC0 = UTC. Belgium: CET-1CEST,M3.5.0,M10.5.0/3</p><button>Save/connect</button></form>";
 p+="<h2>Local messages</h2><p>Matching devices must share a Wi-Fi network. No relaying, encryption or delivery guarantee.</p><form method=post action=/msg><input name=text maxlength=160><button>Send</button></form><h2>Note</h2><form method=post action=/note><textarea name=text maxlength=500>"+htmlEscape(note)+"</textarea><button>Save</button></form>";
 p+="<h2>File downloader</h2><p>Direct HTTP files only, maximum 256 KiB. Files stored on microSD in /data. No audio playback, streaming service support or HTTPS downloads.</p><form method=post action=/download><input name=url placeholder='http://...' maxlength=300><button>Download</button></form><p><a href=/file>Retrieve saved file</a></p><h2>Bluetooth PocketLink</h2><p>BLE text only. Use a BLE UART app: Nordic UART service, write RX, subscribe TX. Maximum 160 bytes per message; negotiate a suitable MTU or send short messages. Ordinary headphones cannot connect.</p>";
 web.send(200,"text/html",p);}
void fetchWeather(){if(WiFi.status()!=WL_CONNECTED||!lat.length()||!lon.length()){weather="Set Wi-Fi and latitude/longitude in the web page.";return;}
 HTTPClient h;h.setTimeout(3500);String url="http://api.open-meteo.com/v1/forecast?latitude="+lat+"&longitude="+lon+"&current=temperature_2m,weather_code";
 h.begin(url);int code=h.GET();if(code==200){String j=h.getString();int c=j.indexOf("\"current\":");int a=j.indexOf("\"temperature_2m\":",c);int b=j.indexOf("\"weather_code\":",c);if(c>=0&&a>=0&&b>=0){float temp=j.substring(a+17).toFloat();int wc=j.substring(b+15).toInt();weather=String(temp,1)+" C | WMO code "+String(wc)+" | "+clockText()+" | Open-Meteo";}else weather="Weather response not understood";}else weather="Weather unavailable: HTTP "+String(code);h.end();}
#include "extras.h"
#include "security.h"
#include "system_ui.h"
#include "organizer.h"
#include "pocket_apps.h"
void setup(){hardwareSetup();prefs.begin("pocket",false);securityInit();lat=prefs.getString("lat","");lon=prefs.getString("lon","");zone=prefs.getString("tz","UTC0");cardSPI.begin(12,11,13,10);fsOK=SD.begin(10,cardSPI,4000000);
 if(fsOK){SD.mkdir("/data");SD.mkdir("/apps");SD.mkdir("/data/music");File f=SD.open("/data/note.txt","r");if(f){note=f.readString().substring(0,500);f.close();}else note="";}else note="";
 aodEnabled=prefs.getBool("aod",true);idleSeconds=prefs.getInt("idle",60);
 WiFi.mode(WIFI_AP_STA);apName="Pocket-"+String((uint32_t)ESP.getEfuseMac(),HEX);WiFi.softAP(apName.c_str(),"pocket1234");String ss=prefs.getString("ssid","");if(ss.length())WiFi.begin(ss.c_str(),prefs.getString("pass","").c_str());configTzTime(zone.c_str(),"pool.ntp.org","time.google.com");udp.begin(4210);
 BLEDevice::init(apName.c_str());BLEServer *server=BLEDevice::createServer();server->setCallbacks(new LinkServer());BLEService *service=server->createService(serviceUUID);tx=service->createCharacteristic("6e400003-b5a3-f393-e0a9-e50e24dcca9e",BLECharacteristic::PROPERTY_NOTIFY);tx->addDescriptor(new BLE2902());auto rx=service->createCharacteristic("6e400002-b5a3-f393-e0a9-e50e24dcca9e",BLECharacteristic::PROPERTY_WRITE|BLECharacteristic::PROPERTY_WRITE_NR);rx->setCallbacks(new Receiver());auto fr=service->createCharacteristic("6e400004-b5a3-f393-e0a9-e50e24dcca9e",BLECharacteristic::PROPERTY_WRITE);fr->setCallbacks(new FileReceiver());service->start();BLEDevice::getAdvertising()->addServiceUUID(serviceUUID);BLEDevice::getAdvertising()->start();
 web.on("/",page);dropSetup();
 web.on("/transfer",[]{web.send_P(200,"text/html",transferPage);});
 web.on("/bluetooth-file",[]{File f=SD.open("/data/bluetooth.bin","r");if(!f){web.send(404,"text/plain","No Bluetooth file");return;}web.sendHeader("Content-Disposition","attachment; filename=bluetooth.bin");web.streamFile(f,"application/octet-stream");f.close();});
 web.on("/tools",[]{web.send_P(200,"text/html",toolsPage);});
 web.on("/reader",HTTP_POST,[]{String result=readPage(web.arg("url").substring(0,300));show(result);web.send(200,"text/plain; charset=utf-8",result);});
 web.on("/config",HTTP_POST,[]{String la=web.arg("lat"),lo=web.arg("lon");if(la.length()&&lo.length()){if(la.toFloat()<-90||la.toFloat()>90||lo.toFloat()<-180||lo.toFloat()>180){web.send(400,"text/plain","Invalid coordinates");return;}lat=String(la.toFloat(),5);lon=String(lo.toFloat(),5);prefs.putString("lat",lat);prefs.putString("lon",lon);}zone=web.arg("tz").substring(0,80);prefs.putString("tz",zone);configTzTime(zone.c_str(),"pool.ntp.org");if(web.arg("ssid").length()){prefs.putString("ssid",web.arg("ssid"));prefs.putString("pass",web.arg("pass"));WiFi.begin(web.arg("ssid").c_str(),web.arg("pass").c_str());}weatherDue=true;web.send(200,"text/plain","Saved. Return to the home page in a few seconds.");});
 web.on("/msg",HTTP_POST,[]{sendMessage(web.arg("text"));web.send(200,"text/plain","Sent without delivery confirmation");});
 web.on("/note",HTTP_POST,[]{note=web.arg("text").substring(0,500);saveNote();web.send(200,"text/plain","Saved");});
 web.on("/file",HTTP_GET,[]{File f=SD.open("/data/download.bin","r");if(!f){web.send(404,"text/plain","No file");return;}web.sendHeader("Content-Disposition","attachment; filename=download.bin");web.streamFile(f,"application/octet-stream");f.close();});
 web.on("/download",HTTP_POST,[]{String url=web.arg("url");if(!fsOK||!url.startsWith("http://")){web.send(400,"text/plain","Storage unavailable or URL is not HTTP");return;}HTTPClient h;h.setTimeout(4000);h.begin(url);int code=h.GET(),len=h.getSize();if(code!=200||len<0||len>262144){h.end();web.send(400,"text/plain","Need HTTP 200 and Content-Length of at most 256 KiB");return;}File f=SD.open("/data/temp","w");if(!f){h.end();web.send(500,"text/plain","Cannot open storage");return;}uint8_t buf[1024];int remain=len;unsigned long progress=millis();while(remain>0&&millis()-progress<5000){int n=h.getStreamPtr()->available();if(n){n=h.getStreamPtr()->readBytes(buf,min(n,min(remain,1024)));if(f.write(buf,n)!=(size_t)n)break;remain-=n;progress=millis();}else delay(2);}f.close();h.end();if(remain){SD.remove("/data/temp");web.send(500,"text/plain","Download failed; previous file kept");}else{SD.remove("/data/download.bin");SD.rename("/data/temp","/data/download.bin");web.send(200,"text/plain","Saved. No audio playback in this build.");}});
 web.begin();answer="Welcome! Tap WIFI at the top to set up Wi-Fi here. Type settings for location and timezone. No phone needed. Use Aa for uppercase and #+= for symbols.";dirty=true;lastInteraction=millis();if(prefs.getString("build","")!=String(__DATE__ " " __TIME__)){menuOpen=true;answer="Welcome / updated! Tap WIFI, select your router and enter password. Tap AUTO for approximate weather location and timezone. Tap DONE to keep settings.";}}
void loop(){securityTick();organizerTick();appsTick();networkTick();fileTick();web.handleClient();int n=udp.parsePacket();if(n){char b[220];int k=udp.read(b,219);if(k>0){b[k]=0;String p=b;if(p.startsWith("PKT1|")&&!p.startsWith("PKT1|"+apName+"|")){inbox=p.substring(5);show("Wi-Fi message: "+inbox);}}}
 String pending;portENTER_CRITICAL(&mux);pending=String(blePending);blePending[0]=0;portEXIT_CRITICAL(&mux);if(pending.length()){inbox="BLE: "+pending;show(inbox);}
 static bool wasConnected=false;bool connected=WiFi.status()==WL_CONNECTED;if(connected&&!wasConnected)weatherDue=true;wasConnected=connected;
 if((weatherDue||(millis()-lastWeather>1800000UL))&&connected){weatherDue=false;lastWeather=millis();fetchWeather();if(!menuOpen)show(weather);}
 if(alertDeadline&&(int32_t)(millis()-alertDeadline)>=0){alertDeadline=0;show("TIMER FINISHED (visual alert only)");}
 if(millis()/60000!=lastMinute){lastMinute=millis()/60000;Serial.println(clockText());}
 chatLoop();}