Send two messages to Mqtt Broker

Hardware DIY
, ,
1

Hi all,

i am currently using a ESP8266 to log the roomtemperature with a DHT22.
I now want to switch to a bme280 and log also the Air Humidity.

i am using this code

local SSID = "XXXXX"
local SSID_PASSWORD = "XXXX"
local SIGNAL_MODE = wifi.PHYMODE_N
 
MQTT_CLIENT_ID = node.chipid()
MQTT_CLIENT_USER = "openhabian"
MQTT_CLIENT_PASSWORD = "openhabian"
MQTT_CLIENT_KEEPALIVE_TIME = 120

 
MQTT_BROKER = "192.168.0.132"
MQTT_BROKER_PORT = 1883
MQTT_TOPIC_IN = "esp8266_station123/in" -- commands
MQTT_TOPIC_OUT = "bme280_Wohnzimmer/out" -- send values
MQTT_TOPIC_OUT2 = "bme280_Wohnzimmer/out2"
MQTT_TOPIC_OUT3 = "bme280_Wohnzimmer/out3"
MQTT_BROKER_SECURE = 0
m = nil

sda, scl = 3, 4
i2c.setup(0, sda, scl, i2c.SLOW) 
bme280.setup()

function wait_for_wifi_conn ( callback )
   tmr.alarm (1, 1000, 1, function ( )
      if wifi.sta.getip ( ) == nil then
         print ("Waiting for Wifi connection")
      else
         tmr.stop (1)
         print("\n====================================")
         print ("ESP8266 mode is: " .. wifi.getmode ( ))
         print ("The module MAC address is: " .. wifi.ap.getmac ( ))
         print ("Config done, IP is " .. wifi.sta.getip ( ))
         print("====================================")
 
        callback()
      end
   end)
end
 
 
function mqtt_handler()
    m = mqtt.Client(MQTT_CLIENT_ID, MQTT_CLIENT_KEEPALIVE_TIME, MQTT_CLIENT_USER, MQTT_CLIENT_PASSWORD)
    
    -- on publish message receive event
    m:on("message", function(client, topic, data) 
      print("Received:" .. topic .. ":" ) 
      if data ~= nil then
        --print(data)
        if data == "req" then
            sendValue()
        end
      end
    end)
    m:on("offline", function(m)
        print ("\n\nDisconnected from broker")
        print("Heap: ", node.heap())
    end)
 
    m:connect(MQTT_BROKER, MQTT_BROKER_PORT, MQTT_BROKER_SECURE, function(client)
      print("connected")
      client:subscribe(MQTT_TOPIC_IN, 0, function(client) print("subscribe success") end)
    end,
    function(client, reason)
      print("failed reason: " .. reason)
    end)
 
    -- send all 30 sec
    tmr.alarm (2, 10*1000, tmr.ALARM_AUTO, function ( )
        sendValue()
    end)
    
end
 
function sendValue()
    -- do stuff

T, P, H, QNH = bme280.read(46)
print(T/100) 
print(H/1000)
print(P/1000)
    local temperature = T/100
    local humi = H/1000
    local preassure = P/1000
    -- publish to broker on topic
    m:publish(MQTT_TOPIC_OUT, temperature, 0, 0, function(client) print("sent value="..temperature) end)
    m:publish(MQTT_TOPIC_OUT2, humi, 0, 0, function(client) print("sent value="..humi) end)
  --  m:publish(MQTT_TOPIC_OUT3, preassure, 0, 0, function(client) print("sent value="..preassure) end)
end
 
 
 
-- Configure the ESP as a station (client)
wifi.setmode(wifi.STATION)
wifi.setphymode(SIGNAL_MODE)
wifi.sta.config {ssid=SSID, pwd=SSID_PASSWORD}
wifi.sta.autoconnect(1)
 
-- Hang out until we get a wifi connection before the httpd server is started.
wait_for_wifi_conn( mqtt_handler )

When i only send one value to the mqtt broker using

m:publish(MQTT_TOPIC_OUT2, humi, 0, 0, function(client) print("sent value="..humi) end)

but when want to send two or more values to the broker i get this error message:

PANIC: unprotected error in call to Lua API (stdin:11: attempt to index global ‘m’ (a nil value))

ets Jan 8 2013,rst cause:2, boot mode:(3,6)

how can i send multiple parameters to the mqtt broker? Does anyone have a tutorial?

2

You will probably have better luck on an ESP8266 or Lua forum. While there are lots of ESP8266 users on this forum, most of them use Tasmota or ESPEasy or the like. You will reach a far larger audience who can help on some other forum.

3

I didn’t know about ESPEasy before.
But now that i partially know how to programm the esps i think it is no blame to use it :smiley:

I am impressed what an improvement of comfort :blush:

Thanks for the hint!