1.- tinkercad circuits is a good Arduino simulator.
Google images: thikercad circuits
https://www.tinkercad.com/things/aOGZK4NfqdA-funky-albar-maimu/editel?tenant=circuits
- It doesn't work with Bluetooth.
1.- tinkercad circuits is a good Arduino simulator.
Google images: thikercad circuits
https://www.tinkercad.com/things/aOGZK4NfqdA-funky-albar-maimu/editel?tenant=circuits
2. Another Arduino and ESP32 simulator is wokwi
https://wokwi.com/projects/322410731508073042
3.- Example of MQTT with ESP32.
https://wokwi.com/projects/322577683855704658
p117B_mqtt_Extension_WokWi.aia (73.3 KB)
https://community.appinventor.mit.edu/t/esp32-mqtt-broker-publish-subscribe-thingspeak/10490