DEMO using the server test.mosquitto.org

You can use any MQTT client with the following settings
Server : test.mosquitto.org
no login / no password
port: 1883 or 8081 for websocket
Topic: /AnnexTest
Subscribe: /AnnexTx
 
Or you can use the free MQTT online client

https://www.cicciocb.com/MQTT/

this is already configured so just 
- click on Connect
- write your message in "Publish Message" 
- Press "Publish" to send your message that will be shown in the scrolling display
- Click on Subscribe to receive the temperature sensor data


A complete help of Annex32 can be found here
https://cicciocb.com/annex32help/V1.442/

help.txt

# Name,   Type, SubType, Offset,  Size, Flags
nvs,      data, nvs,     0x9000,  0x5000,
otadata,  data, ota,     0xe000,  0x2000,
app0,     app,  ota_0,   0x10000, 0x230000,
app1,     app,  ota_1,   0x240000,0x0C0000,
ffat,     data, fat,     0x300000,0x100000,
#spiffs,   data, spiffs,  0x301000,0xFF000,


partitions.csv

' MQTT SSL test program
' Using mosquitto test server
' a complete help of Annex32 can be found here
' https://cicciocb.com/annex32help/V1.442/
maxscroll.setup 8, 21
maxscroll.print "MQTT Tx & Rx demo"
received = 0
onmqtt mqtt_msg
print mqtt.setup("mqtt://test.mosquitto.org", 1)
print mqtt.connect("", "") ' No login / pass required
print mqtt.subscribe("/AnnexTest") ' subscribe to the topic /AnnexTest
timer0 50, scrollMe
timer1 1000, getTemp
wait

' receive messages from the server
mqtt_msg:
print "TOPIC  : "; mqtt.topic$
print "MESSAGE: "; mqtt.message$
if mqtt.message$ <> "" then
  maxscroll.print mqtt.message$
  received = 1
endif
return

scrollMe:
if received = 0 then
  maxscroll.oscillate 5
else
  maxscroll.scroll 5
endif
return

getTemp:
BETA = 3950
analogValue = adc(34)
celsius = 1 / (log(1 / (4095 / analogValue - 1)) / BETA + 1.0 / 298.15) - 273.15
print "celsius "; celsius
ret = mqtt.publish("/AnnexTx", str$(celsius)) 
return
