--- title: "W5100S-EVB-Pico [Micropython] ? MQTT" url: "https://maker.wiznet.io/louis_m/projects/W5100SEVBPico-Micropython-MQTT/" markdown_url: "https://maker.wiznet.io/louis_m/projects/W5100SEVBPico-Micropython-MQTT/md" type: "UCC: User Created Content" author: "Louis" author_url: "https://maker.wiznet.io/louis_m/" original_author: "louis_m" original_url: "https://www.hackster.io/louis_m/w5100s-evb-pico-micropython-mqtt-1a55ac" published: "2022-01-10" language: "en" hardware: ["WIZnet W5100S-EVB-Pico", "Raspberry Pi 4"] likes: 0 views: 1136 comments: 0 source: "WIZnet Makers (https://maker.wiznet.io/)" --- # W5100S-EVB-Pico [Micropython] ? MQTT > W5100S-EVB-Pico [Micropython] ? MQTT Original author: louis_m (source: https://www.hackster.io/louis_m/w5100s-evb-pico-micropython-mqtt-1a55ac) ## Components - **WIZnet W5100S-EVB-Pico** x 1 ([docs](https://docs.wiznet.io/Product/Chip/Ethernet/W5100S/w5100s-evb-pico)) - **Raspberry Pi 4** x 1 ([docs](https://www.raspberrypi.com/products/raspberry-pi-4-model-b/)) - Software: **Micopython** ## Documents and links - [MQTT_pub](http://maker.wiznet.io/uploads/2022/01/mqtt_pub-0.py) (code) - [MQTT_sub](http://maker.wiznet.io/uploads/2022/01/mqtt_sub-1.py) (code) ## Article ### MQTT? The pub/sub model and subscriber/subscriber model are communication models between subscription clients and issuance clients. - Lightweight message protocols created for use in M2M and the Internet of Things. - Operation on TCP - <Publisher> issues Topic. - <Subscriber> subscribes to Topic. - <Broker> serves as a relay and is suitable for 1:N communication. - Suitable for messaging processing of "device to devices" such as low power power sensors, mobile devices, embedded computers, Arduinoes, and microcontrollers. ### Overview > WIZnet Ethernet HAT (Hardware Attached on Top) is a Raspberry Pi Pico pin-compatible board that utilizes W5100S and supports both 3.3V & 5V. Please refer to this link to find more information about?[W5100S.](https://docs.wiznet.io/Product/iEthernet/W5100S/overview) - Raspberry Pi Pico Pin-Compatible - Ethernet (W5100S Hardwired TCP/IP CHIP) - Product page :? - Support?**4 Independent Hardware SOCKET**s simultaneously - Support SOCKET-less new Command:?**ARP-Request, PING-Request** - Support?**Auto-MDIX only when Auto-Negotiation modeRP2040**?Datasheet -? ![RP2040](https://hackster.imgix.net/uploads/attachments/1394729/image_rjXDwkzhto.png?auto=compress%2Cformat&w=740&h=555&fit=max) RP2040 ### Prepare > **Connect Raspberry Pi** ![](https://hackster.imgix.net/uploads/attachments/1394792/image_PNyVJQmVff.png?auto=compress%2Cformat&w=740&h=555&fit=max) *Power the power supply and connect the Ethernet cable.* > **Run RPi-4 Mosquitto Server.** After having your Raspberry Pi board prepared with Raspberry Pi OS, you can continue with this tutorial. Let’s install the?**[Mosquitto Broker](http://mosquitto.org/)**[.](http://mosquitto.org/) 1. Raspberry Pi opens the terminal window through SSH. ![Open Rpi Terminal](https://hackster.imgix.net/uploads/attachments/1394779/image_Ha5IivctTZ.png?auto=compress%2Cformat&w=740&h=555&fit=max) Open Rpi Terminal 2.Run the following command to upgrade and update your system: ``` pi@raspberry:~ $ sudo apt update && sudo apt upgrade ``` 3. Press?**Y**?and?**Enter**. It will take some time to update and upgrade (in my case, it took approximately 10 minutes). 4. To install the Mosquitto Broker enter these next commands: ``` pi@raspberry:~ $ sudo apt install -y mosquitto mosquitto-clients ``` 5. To make Mosquitto auto start when the Raspberry Pi boots, you need to run the following command (this means that the Mosquitto broker will automatically start when the Raspberry Pi starts): ``` pi@raspberry:~ $ sudo systemctl enable mosquitto.service ``` 6. Now, test the installation by running the following command: ``` pi@raspberry:~ $ mosquitto -v ``` 7. Check if the Mosquitto server is operating with the command below. You can also stop and start the server with commands. `Status` ``` pi@raspberry:~ $service mosquitto status ``` `Stop` ``` pi@raspberry:~ $service mosquitto stop ``` `Start` ``` pi@raspberry:~ $service mosquitto start ``` If you check the status as below, the server will operate normally. ![Mosquitto status](https://hackster.imgix.net/uploads/attachments/1394783/image_Y1xB18iwQ6.png?auto=compress%2Cformat&w=740&h=555&fit=max) Mosquitto status > **Connect W5100S-Pico-EVB** ![W5100S-PIco-EVB](https://hackster.imgix.net/uploads/attachments/1394731/image_dS3TqxOjsr.png?auto=compress%2Cformat&w=740&h=555&fit=max) W5100S-PIco-EVB *Connect Raspberry Pi Pico to desktop or laptop using 5 pin micro USB cable.* > **Development environment configuration** ![Micropython Thonny IDE](https://hackster.imgix.net/uploads/attachments/1394784/image_T8qmrGvq5B.png?auto=compress%2Cformat&w=740&h=555&fit=max) Micropython Thonny IDE Install?`Thonny IDE`?on Raspberry Pi Pico by referring to the link?[above.??](http://above.xn--sp8h/) 1. The drive will be called?**RPI-RP2**?on all RP2040 boards. Download the?**UF2**(firmware.uf2) file from the link below and put the file in Pico. **File link - ** ![](https://hackster.imgix.net/uploads/attachments/1394785/image_3dx1U323sy.png?auto=compress%2Cformat&w=740&h=555&fit=max) 2. You can also access the firmware installation menu if you click on?**MicroPython (Raspberry Pi Pico)**?in the status bar and choose ‘Configure interpreter …’. ![](https://hackster.imgix.net/uploads/attachments/1394789/image_KwJ5NzFq6K.png?auto=compress%2Cformat&w=740&h=555&fit=max) 3. Look at the Shell panel at the bottom of the Thonny editor. You should see something like this: ![](https://hackster.imgix.net/uploads/attachments/1394790/image_eDQIR0G76k.png?auto=compress%2Cformat&w=740&h=555&fit=max) ### Importing MQTT library > First, import the library of the function you want to use from the library to your PC. To uploading a file to using?**Thonny IDE**, follow these next steps. **[Micropython Ethernet Libraries](https://github.com/Wiznet/RP2040-HAT-MicroPython/tree/main/libraries)** - Create a new file, Save it in your computer with the exact name that you want, for example “**(your library name).py**” - Go to?**Open > This computer** ![](https://hackster.imgix.net/uploads/attachments/1394796/image_DvwlwX5u3w.png?auto=compress%2Cformat&w=740&h=555&fit=max) The file should be saved on RPi Pico with the name?**“(your library name).py”** - Go to?**File > Save as > Raspberry Pi Pico** ![](https://hackster.imgix.net/uploads/attachments/1394797/image_EZYhjZoNiV.png?auto=compress%2Cformat&w=740&h=555&fit=max) ### Publish > **#### MQTT Pico (1) #####**?- publish 1. Setup SPI interface and Initialize ethernet configuration. ``` spi=SPI(0,2_000_000, mosi=Pin(19),miso=Pin(16),sck=Pin(18)) nic = network.WIZNET5K(spi,Pin(17),Pin(20)) #spi,cs,reset pin nic.ifconfig(('192.168.1.20','255.255.255.0','192.168.1.1','8.8.8.8')) while not nic.isconnected(): time.sleep(1) print(nic.regs()) ``` 2.In the MQTT configuration, the broker IP address is the IP of your Raspberry Pi server. ``` #mqtt config mqtt_server = '192.168.1.7' client_id = 'wiz1' topic_pub = b'hello' topic_msg = b'Hello Pico' last_message = 0 message_interval = 5 counter = 0 #MQTT connect def mqtt_connect(): client = MQTTClient(client_id, mqtt_server, keepalive=60) client.connect() print('Connected to %s MQTT Broker'%(mqtt_server)) return client #reconnect & reset def reconnect(): print('Failed to connected to MQTT Broker. Reconnecting...') time.sleep(5) machine.reset() ``` 3. going to use MQTT Publish. ``` #MQTT Publish def main(): w5x00_init() try: client = mqtt_connect() except OSError as e: reconnect() while True: client.publish(topic_pub, topic_msg) time.sleep(3) client.disconnect() ``` **Sending a "Hello WIZnet" message to the mosquitto server with the topic "Hello".** ![MQTT Publish](https://hackster.imgix.net/uploads/attachments/1394826/image_G5xV7TdIY9.png?auto=compress%2Cformat&w=740&h=555&fit=max) MQTT Publish ### Subscribe > **#### MQTT Pico (2) #####**?- subscribe 1. Setup SPI interface and Initialize ethernet configuration. ``` spi=SPI(0,2_000_000, mosi=Pin(19),miso=Pin(16),sck=Pin(18)) nic = network.WIZNET5K(spi,Pin(17),Pin(20)) #spi,cs,reset pin nic.ifconfig(('192.168.1.20','255.255.255.0','192.168.1.1','8.8.8.8')) while not nic.isconnected(): time.sleep(1) print(nic.regs()) ``` 2. In the MQTT configuration, the broker IP address is the IP of your Raspberry Pi server. ``` #mqtt config mqtt_server = '192.168.1.7' client_id = "wiz" topic_sub = b'hello' last_message = 0 message_interval = 5 counter = 0 def sub_cb(topic, msg): print((topic.decode('utf-8'), msg.decode('utf-8'))) #MQTT connect def mqtt_connect(): client = MQTTClient(client_id, mqtt_server, keepalive=60) client.set_callback(sub_cb) client.connect() print('Connected to %s MQTT Broker'%(mqtt_server)) return client #reconnect & reset def reconnect(): print('Failed to connected to Broker. Reconnecting...') time.sleep(5) machine.reset() ``` 3. going to use MQTT Subscribe. ``` #subscribe def main(): w5x00_init() try: client = mqtt_connect() except OSError as e: reconnect() while True: client.subscribe(topic_sub) time.sleep(1) client.disconnect() ``` **If you subscribe to "Hello" topic, you can get a message from Publisher.** ![MQTT Subscribe](https://hackster.imgix.net/uploads/attachments/1394830/image_LgBlejLr0y.png?auto=compress%2Cformat&w=740&h=555&fit=max) MQTT Subscribe --- Source: https://maker.wiznet.io/louis_m/projects/W5100SEVBPico-Micropython-MQTT/