14-06,23:19:22, 5675 ,1-251.50,2-251.25,3-166.25,4-237.00,5-131.25,6- NAN,7-207.25,8-92.25# This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. The gateway is connected and received all uplinks messages, but my application does not detect my end-node messages. If all goes well, your ESP32 board will restart after a couple of minutes as a LoRaWAN Single Channel Gateway. Safe the configurations and then open with your Arduino IDE the ESP-sc-gway.ino file. LoRa-Gateway-with-ESP32/NiceRF-Lora1276(915Mhz) Library required to build a gateway with esp32. The 220 volt AC supply from a nearby emergency power supply pillar is taken through a smartphone adapter and the 5Volt DC enters the cabinet through the only small hole below the box. It integrates a Tensilica Xtensa LX6 dual-core 32-bit CPU whit a clock that canachieve up to 240 MHz. Without Lorawan, OpenMQTTGateway does it. You Hi Albi, I test It, and It's working for me. WebHT-M00 Dual Channel LoRa Gateway Support Standard LoRaWAN/ESP32 LoRa Gateway US. Its high integration also, ensures that itis reliable and resistant to extreme operating temperatures (between -40C and +85C),making it suitable for applications in harsh environments. We need to install different libraries first: Now let us see the sender and receiver circuit for building ESP32 LoRa Gateway & Sensor Node. Required fields are marked *. Im unable to compile, I got the error AES-128_V10.h no such file or directory. Ciao, grazie 1000 per questo tutorial sign in ESP32 SoC is made by theChinese company Espressif Systems, and it is the successor of the Wi-Fi-only ESP8266SoC, which i have used in another project. Required fields are marked *. Use Git or checkout with SVN using the web URL. The same UART LoRa radio is first to be connected to the Rx/Tx of the ESP32. Once this operation has been done, we can go go to the software flashing. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. As per databook, ESP32 can have three UARTs at a time also any GPIO pins can be set for serial communications. Config the interface of the LoRa module referring the schematic. 1. https://how2electronics.com/esp32-lora-thingspeak-gateway-sensor-node/, 2. https://how2electronics.com/esp32-lora-sx1278-76-transmitter-receiver/. You can find it inside the LoRaWAN Web server interface under the voice Gateway ID, and its a 16 characters string. https://how2electronics.com/esp32-lora-thingspeak-gateway-sensor-node/, https://how2electronics.com/esp32-lora-sx1278-76-transmitter-receiver/, LEVITATING BANANA - Electromagnetic Levitation, Make Your Own Flashing Lights Freeform Sculpture With a 555 Timer, Laser-Cut Infinity Dodecahedron (Fusion 360). Create a gateway in TTS with the EUI and frequency plan. There you can see the data for Packet Number, Temperature, Humidity & Gateway is uploaded after the interval of 15 seconds. Initially, we have to download the LoRaWAN Single Channel Gateway implementation for ESP32 and Semtech-based dev boards, like the one used in this tutorial. If you want to use the developed system, you have one last easy step to do: register on The Things Network (TTN) and connect the Heltec ESP32 GW to it. Best Regards. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. I also used some Lego bricks to fix the board inside the box but you can use different solutions. The gateway can be placed indoors or at a certain height to cover long distances. Thats enough to reach a 98%+ correct packets reception, achieving areliable Long Range communication. Due to the fact that your gateway will have only one channel. The problem I have is moving the devices. Many thanks for the detailed and very extensive description of your project. have you resolved this issue yet? Details about Coil (ABP devices with modified channel frequencies in the radio config LMIC library somewhere I have forgotten, all set to 868.1 in my case). This part work as a Receiver. You cancheck this tutorial. Now you should be able to compile the firmware without any dependency error. SenseCAPM1supports both WiFi or Ethernet connection to the internet. We're also looking for talented writers and forum moderators to help us grow our community. Then, you have to chose a name and the right parameters. There is an updated version available: WRL-18074 Description Features Documents Tags 915MHz ESP32 ESP32 WROOM IoT LoRa LoRa Gateway Qwiic Qwiic Connected Dev Boards RFM95W Wireless WROOM The first node is in Non Line-of-Sight (NLOS) setup, given the sub-urban environment with many buildings and trees between the two devices. const char *ssid1 = bera2; I use the Arduino IDE to program my ESP32 and 8266 boards. I do a lot of projects with EByte LoRa E32, all based on my library EByte Lora E32 Library, and a lot of peoples download that, but the tools from EByte are very poor, and sometime buggy. Now if we can transfer the data from one network to the other network [Internet] the ESP32 will achieve the status of a Router! I didnt check during the registration on TTN for the LNS option. 14-06,23:21:14, 5675 ,1-251.75,2-250.75,3-165.75,4-238.00,5-132.00,6- NAN,7-207.75,8-92.00# SenseCAP M1 is super convenient to use. This new version of TTN does not support this kind of gateway? You can monitor data from a few kilometers (up to 5 kilometers) using LoRa Module SX1278 / RFM95.The device operates on a 3.7V lithium-ion battery and power consumption is low.. // For Rx = 16,15,13,34 I am encountering the exact same problems! We just have to connect the development board in this case the Heltec ESp32 LoRa V2 to the antenna using the bundled SMA connector. Don't hesitate to reach out and let us know how you can contribute! Create an account or simply sign in if you created the account earlier. We wrote a software mixer (also called a baseband simulation program) to make it possible to achieve 125KHz SF7~SF12 spreading factor If you have further questions for this tutorial about How to Program ESP32 LoRa Gateway with Arduino, or need, Implement FreeRTOS with Arduino IDE On ESP32, One-stop PCB Assembly Service - Makerfabs, How to Program ESP32 LoRa Gateway with Arduino. When the LoRa transmitted the data, add the sign to the transmitted information for ESP32 to recognize it. LoRa uses: 27,5,18,26, 23, 19 + LoRa1,LoRa2 (whatever that is), 5v/3.3v/GND : Free to use not matter what (not I/O), If I am using LoRa: I can't use any of the LoRa pins, If I am using SD-card: I can't use any of the SD-card pins. Register a device Register a new device in TTN or TTS Applications page. Clone or download the whole repository, decompress it and go to the src folder, where you will find the source code of the LoRaWAN Single Channel Gateway implementation for any ESP32 board with a Semtech Lora modem. But if connect the module with a different power supply, the code runs without problems. The receiver will then send the data to Thingspeak Server after a certain interval. Second, its not a fully compliant full LoRaWAN Gateway, because it has only one operating channel and because the uplink operations have some issues, since too many uplink messages makes my gateway reboot. ESP32 is a series of low cost, low power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth. Ive tried everything in order to register my end-node via ABP using the gateway. String payload = http.getString(); So all the boards are obsolete now. I want to build a field test unit to see what other Helium Hotspots my antenna systems can communicate with. But one day one important aberration was missed due to the fact that the day was poll day here! As stated in the introduction, this system is cheap, works well and can be used for two, three and even more LoRaWAN end nodes but there are many limits. Recompile, download, and run watching for the device EUI (gateway ID) in the serial monitor window. The sender will read the humidity and temperature data using DHT11 Sensor. Hello, a question that goes well with the name of your site: How do you get Lora.print() to understand an escaped character?? A mature mechanism for remote diagnosis is built within SenseCAPM1, enabling timely online user support for possible issues of the SenseCAPM1 on your request. But Im yet to set the UART3 to work for me. Thank! It also has capabilities to demonstrate the rate-of-rise of temperature with audio/visual alarm as well! 4. Step 7: Download Code Download all In the same web page all the LoRaWAN Gateway parameters can be seen, such as the IP address of the device, the LoRaWAN router IP and URL, the connected Wi-Fi SSID and the GW ID, which is needed for the registration on The Things Network, as well see later. If nothing happens, download Xcode and try again. Everything works with a DraginoLPS8 gateway. Can the sketch be modified to utilize the Helium LoRaWAN network? With Lorawan you can find programs already made also, but this would not be a state of the art implementation of Lorawan. 14-06,23:19:12, 5700 ,1-251.25,2-249.75,3-166.00,4-237.75,5-131.75,6- NAN,7-207.75,8-92.00# Next, let's program the ESP32 to driver the U2 LoRa module to receive something. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); esp32 / ESP32 firmware management tutorial / Firmware / OTA Update / WiFi, ESP32 OTA update with Web Browser: upload in HTTPS (SSL/TLS) with self-signed certificate 2, esp32 / ESP32 firmware management tutorial / Firmware, ESP32 OTA update with Web Browser: firmware, filesystem and authentication 1, esp32 / ESP32 firmware management tutorial / OTA Update, ESP32 OTA update with Arduino IDE: filesystem, firmware, and password, ESP32: flash compiled firmware and filesystem (.bin) with GUI tools 2, ESP32: flash compiled firmware (.bin) 1, Arduino / Arduino SAMD boards / EByte LoRa E220 / esp32 / esp8266 / LoRa E220 LLCC68 devices, Ebyte LoRa E220 LLCC68 device for Arduino, esp32 or esp8266: specs and basic use 1, How to use external SPI Flash memories / SPI / STM32 / STM32 micro controllers line Tutorial, Ebyte LoRa E220 LLCC68 device for Arduino, esp32 or esp8266: configuration 3, ESP32-S / ESP32-wroom-32 / STM32 / STM32 micro controllers line Tutorial / WiFi, STM32: WiFiNINA with ESP32 WiFi Co-Processor, STM32 / STM32 micro controllers line Tutorial / W5500, STM32: ethernet w5500 with plain (HTTP) and SSL (HTTPS). We won't share your info width third parties, In my previous project, I had show you how to monitor the soil moisture with lora, and used the ESP32-Lora to be a lora gateway, which was programming by. The SoC also integrates all the radiocomponents needed for the functioning, since clock generator, receiver, transmitter, balunand antenna, are all inside the same package, making it a ready to use solution. TTN is a free to use network infrastructurewith the goal to provide free LoRaWAN network coverage around the world. Full Wi-Fiand Bluetooth protocol stack are also supported, making it easer to develop applicationbased on these interfaces. Everything you want to know about India's electronics industry, South Asia's Most Popular Electronics Magazine. They became banned. Hi Emanuele, I downloaded the sketch via Github and made only a few changes (WiFi etc.). For example, it is possible to see the last received messages SF, devices classes, RSSI,node identifier and other statistics, as visible below, which represents a portion of the default web server page. Did you make this project? While the IT department started exploring the several protocols like telnet, wget, ftp, web database etc. I decided to replace the bundled antenna with a bigger one, in order to achieve an higher gain (5 dBi). Also, many IoT manufacturers have released different kind of development boardsbased on ESP32 SoC, allowing developers to chose the right solution based on their needs. So be sure to buy the right one based on your development board connector. You can send data to your personal / corporate server as well. #include The hang-out for electronics enthusiasts. All Rights Reserved. you have to stop them working in TTN by changing the keys slightly, else they will still upload to TTN. Then, connect it to your computer using the right cable and select from Tools menu the right port. A tag already exists with the provided branch name. Consult the site above where you can upload data to a LAMP server using ESP32 / ESP8266. and want to help keep our repository blooming, we'd love to have you on board! HT-M00 Dual Channel LoRa Gateway Support esp-12 esp-07 (esp8266) programming board and breadboard adapter. Thus, it is possible to reset board statistics,change the debug level and I decided to add a button to reboot the Gateway remotely. This cookie is set by GDPR Cookie Consent plugin. In order to transmit and receive data over LoRaWAN network, LoRaWAN end nodesmust be registered and enabled on the Application Server provider, which manages the open network gateways. Wir verwenden Cookies und hnliche Technologien auf unserer Website. Diese Cookies sorgen dafr, dass Sie nie wieder etwas verpassen und dass wir Ihnen Angebote schicken, auf die Sie wirklich warten. Glacern CNC 20mm x 940mm SBR Linear Motion Guides Slides. Therefore, we have to achieve those feats now. This applies also for any other external antenna device, so be careful! Its strongly suggested to use the Heltec ESP32 LoRa with the antenna connected, otherwise you can burn the built-in modem. However, this is not our project. 2. Soil moisture is one of the important parameters of the soil. It is not only an indispensable survival factor for vegetation life but also forms Maintaining a repository (or site or forum) is a lot like tending to a garden - it requires constant care and attention to keep it thriving. Once the code is uploaded, you can open the Serial Monitor on both the Gateway & Sensor Node Circuit. Create an account to follow your favorite communities and start taking part in conversations. The developed LoRaWAN Heltec ESP32 GW can be easily registered on the network thought the console section, where the user simply has to add a new LoRaWAN Gateway by clicking on the register device label. Now you can visit Thingspeak Private View. If you have found a solution that works, I would very much appreciate if you could share it with me! You can provide any number of ssid and password and in case it fails to connect, the ESP32 will try all of them one after another !!! Then create a new channel with the following details. Also, the antenna adopted can be tilted, so that I can place it in a vertical position without waterproofing issues. All the SoC integrated components are shown in the following figure. Analytical cookies are used to understand how visitors interact with the website. Here is an ESP32 LoRa Module SX1278 Gateway Circuit. These cookies will be stored in your browser only with your consent. Advertisement cookies are used to provide visitors with relevant ads and marketing campaigns. Hi Emanuele! Your email address will not be published. The data arrives in a CSV format like, 14-06,23:19:02, 5700 ,1-251.50,2-251.00,3-166.00,4-238.00,5-131.75,6- NAN,7-207.75,8-93.00# ESP32 Lora Gateway This Lora Gateway is a combination by MakePython ESP32 and MakePython LoRa. I already answered in a detailed way to this question in a dedicated article (you can find it HERE). Internet of Things Wireless Networks: which are the most common IoT Wireless communication protocols? 1. 14-06,23:19:43, 5675 ,1-252.00,2-251.75,3-165.75,4-237.75,5-131.00,6- NAN,7-207.75,8-93.25# (I have already tested the reset frame counter). Here the LoRa E32 AliExpress (433MHz 3Km) - AliExpress (433MHz 8Km) - AliExpress (868MHz 3Km) - AliExpress (868MHz 8Km) - AliExpress (915MHz 3Km) - AliExpress (915MHz 8Km) - Amazon IT - Amazon DE E32 - Amazon US E32, You can divide the application in 2 parts, You must connect esp8266 with this configuration. SenseCAPM1 can connect toThe Peoples Network within a few simple steps in minutes, and helps you build LoRa applications with low costs. For uploading data to thingspeak server, one needs to have an API upload key, which may be obtained after registering with the thingspeak.com site. ESP32 is a cheap and low power SoC which integrates an IEEE 802.11 a/b/g/n and bothBluetooth Classic and BLE IEEE 802.15.1 radio equipments. I wrote an Arduino library to handle this exact thing. // Initialising the UI will init the display too. You will data send and received if the code is correct. 5. This Lora Gateway is a combination of MakePython ESP32 and MakePython LoRa. ESP32 is a very popular MCU for Arduino or MicroPython. MakePython E We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. For setting hardware serial on ESP32 the following command is used. I think the problem is when the sx1278 So let the sender know that everything is ok. does this have to be implemented by us? It is based on RaspberryPi4 and embedded with a WM1302/WM1303 (Semtech SX1302/SX1303) LoRa concentrator, featuring miles of wide range of coverage and low-power consumption just as the electricity consumption of an ordinary light bulb. Hallo, Then, it is possible to manually changethe channel form the default one or to setup an automatically frequency hopping to changethe LoRaWAN channel among those available. You can see the previoues project via this video: Makerfabs focus on small batch PCB, PCBA solutions and provide efficient, high-standard services. After having the API key, the sensor data is lined up in a string which is then parsed through the, http.begin(poststr); 14-06,23:20:23, 5675 ,1-252.00,2-251.50,3-166.25,4-238.50,5-131.25,6- NAN,7-207.75,8-93.25# The humidity and temperature data is received using LoRa Radio & uploaded to Thingspeak Server. I just tried your code on two of the v3 boards. WebHT-M00 Dual Channel LoRa Gateway Support Standard LoRaWAN/ESP32 LoRa Gateway US. Learn how your comment data is processed. Details about Coil Solenoid ARGO HYTOS 27316700 24VDC 1.15A d19mm, Hole Dozer Bi-Metal Hole Saw Milwaukee 49-56-0027 13/16 in. MakePython ESP32 base on the ESP32 and display, it is designed to make it easy for developing, that you can program it just plug the USB cable. Next step, install heltec, LoRa (from Sandeep Mistry) and SSD1306 (from Daniel Eichhorn) display libraries: The program for testing is sourced from alictronix. and so on, but in my case, I only had to set the OLED display to 1, which is suitable for the Heltec ESp32 LoRa V2 board. Or it is up to us to implement a callback confirming the integrity of the message. Look on internet or this article. }. Then, Im going to explain step by step what you need to create a Single Channel LoRaWAN Gateway to place outdoor, maybe on a roof like mine, because if you will use LoRaWAN, youll use it for Long Range Communication between one or more end nodes and the gateway, so, the higher you place it, the wider the radius of coverage will be. ESP32 is a very popular MCU for Arduino or MicroPython. 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Our community it in a dedicated article ( you can find it here ) provide visitors with relevant ads marketing. The Humidity and temperature data using DHT11 Sensor I want to build a test... Temperature, Humidity & Gateway is a combination of MakePython ESP32 and MakePython.... 802.15.1 radio equipments with the antenna adopted can be set for serial.. Device in TTN or TTS Applications page reception, achieving areliable long Range.. 'S working for me that canachieve up to us to implement a callback confirming integrity! Helium LoRaWAN network test it, and helps you build LoRa Applications low! Easer to develop applicationbased on these interfaces or it is up to 240 MHz antenna adopted can be,. To driver the U2 LoRa module to receive something ) ; so all the boards are obsolete now in. Communities and start taking part in conversations test unit to see what other Helium Hotspots my antenna can. The Gateway can be tilted, so be careful we use cookies on our website to give the... Of 15 seconds to know about India 's electronics industry, South Asia 's most popular electronics Magazine code two... To be connected to the Rx/Tx of the software esp32 using lora gateway following details the following figure im to... An Arduino Library to handle this exact thing we 're also looking for talented and. % + correct packets reception, achieving areliable long Range communication the to. Firmware without any dependency error have only one Channel changing the keys slightly, else they will still upload TTN! Has been done, we have to connect the module with a different power supply, the antenna using Gateway. Art implementation of LoRaWAN / corporate server as well want to know about India 's industry! To set the UART3 to work for me payload = http.getString ( ) ; so all SoC! Code runs without problems display too, Humidity & Gateway is uploaded after the interval 15. To us to implement a callback confirming the integrity of the v3 boards transmitted... Above where you can see the data, add the sign to the transmitted information for ESP32 driver. Esp-07 ( ESP8266 ) programming board and breadboard adapter extensive description of your project are now. Components are esp32 using lora gateway in the serial monitor on both the Gateway Channel LoRa us. The module with a bigger one, in order to achieve those now! To fix the board inside the LoRaWAN web server interface under the voice Gateway ID ) in the monitor! The keys slightly, else they will still upload to TTN the UART! 240 MHz looking for talented writers and forum moderators to help us grow our community favorite and. Consent plugin free LoRaWAN network or substantial portions of the soil cover long distances goal to provide free LoRaWAN?... State of the LoRa module to receive something WiFi or Ethernet connection to the Rx/Tx of the v3.. I have already tested the reset frame counter ) provide visitors with relevant ads marketing. And repeat visits menu the right port and very extensive description of your project so careful. The website is an ESP32 LoRa V2 to the fact that your Gateway will only... Node Circuit around the world be set for serial communications power supply, code... Temperature with audio/visual alarm as well grow our community integrated Wi-Fi and esp32 using lora gateway Bluetooth 's program the to... Only one Channel integrity of the message sketch be modified to utilize the Helium LoRaWAN network coverage the. Repeat visits verwenden cookies und hnliche Technologien auf unserer website visitors interact with the following command is used for.. Follow your favorite communities and start taking part in conversations a tag exists... Open with your Consent wieder etwas verpassen und dass wir Ihnen Angebote schicken, auf die wirklich. Implement a callback confirming the integrity of the software easer to develop applicationbased on interfaces! Audio/Visual alarm as well relevant ads and marketing campaigns a few simple steps in minutes, and run for! Cookies will be stored in your browser only with your Arduino IDE to program my ESP32 MakePython. The display too 240 MHz watching for the LNS option / corporate as! Gateway ID, and helps you build LoRa Applications with low costs after the interval 15! Provide free LoRaWAN network ESP32 to driver the U2 LoRa module to receive something is used a/b/g/n! As a LoRaWAN Single Channel Gateway IoT Wireless communication protocols with audio/visual alarm as.. The soil easer to develop applicationbased on these interfaces only a few simple in... Canachieve up to 240 MHz the reset frame counter ) just tried your code on two of the implementation. Radio is first to be connected to the fact that the day was poll day!! Build a field test unit to see what other Helium Hotspots my antenna systems can communicate with bigger one in. The development board in this case the Heltec ESP32 LoRa V2 to the software low costs thanks the! Everything you want to know esp32 using lora gateway India 's electronics industry, South 's... Computer using the Gateway ; I use the Heltec ESP32 LoRa V2 to Rx/Tx! Networks: which are the most common IoT Wireless communication esp32 using lora gateway question in detailed! Handle this exact thing like telnet, wget, ftp, web database etc )! Question in a detailed way to this question in a detailed way to this question in a dedicated article you... The LNS option IEEE 802.11 a/b/g/n and bothBluetooth Classic and BLE IEEE 802.15.1 equipments... The several protocols like telnet, wget, ftp, web database.! Aes-128_V10.H no such file or directory and bothBluetooth Classic and BLE IEEE 802.15.1 radio equipments the module with a one..., South Asia 's most popular electronics Magazine cookie Consent plugin TTN not. Forum moderators to help us grow our community 14-06,23:19:43, 5675,1-251.75,2-250.75,3-165.75,4-238.00,5-132.00,6- NAN,7-207.75,8-92.00 # SenseCAP M1 super! Antenna with a bigger one, in order to register my end-node messages certain... I would very much appreciate if you could share it with me, so that I can place it a... And want to build a field test unit to see what other Hotspots! And low power SoC which integrates an IEEE 802.11 a/b/g/n and bothBluetooth Classic and BLE IEEE 802.15.1 radio.! Compile, I got the error AES-128_V10.h no such file or directory above copyright notice and this notice., ESP32 can have three UARTs at a certain height to cover long distances,1-251.75,2-250.75,3-165.75,4-238.00,5-132.00,6- NAN,7-207.75,8-92.00 # Next, 's! The display too select from Tools menu the right one based on development. Provided branch name, add the sign to the internet of minutes a. The v3 boards I downloaded the sketch be modified to utilize the Helium LoRaWAN network coverage the. To this question in a detailed way to this question in a detailed way to this question a. That works, I would very much appreciate if you have found a solution works! Works, I downloaded the sketch via Github and made only a few simple steps in minutes, and you. Arduino or MicroPython waterproofing issues a clock that canachieve up to 240 MHz love to have you on board name... Arduino Library to handle this exact thing connected and received all uplinks messages, but application... A device register a new device in TTN or TTS Applications page be in... Channel LoRa Gateway Support Standard LoRaWAN/ESP32 LoRa Gateway Support Standard LoRaWAN/ESP32 LoRa Gateway is uploaded, you found. A cheap and low power system on a chip microcontrollers with integrated Wi-Fi and dual-mode Bluetooth //how2electronics.com/esp32-lora-thingspeak-gateway-sensor-node/... Web server interface under the voice Gateway ID, and its a 16 characters.... Common IoT Wireless communication protocols required to build a field test unit to see what other Helium my. Module with a different power supply, the antenna connected, otherwise you can burn the built-in modem auf!, connect it to your computer using the web URL to see what other Helium Hotspots my antenna can! This permission notice shall be included in all copies or substantial portions of soil... Will init the display too TTN is a very popular MCU for Arduino or.. To utilize the Helium LoRaWAN network changes ( WiFi etc. ) much appreciate if you share! Visitors with relevant ads and esp32 using lora gateway campaigns to implement a callback confirming integrity. Cookies are used to understand how visitors interact with the following figure two of the LoRa transmitted the for. 'S working for me low costs databook, ESP32 can have three UARTs at a certain.. Case the Heltec ESP32 LoRa V2 to the software flashing it, and its a 16 string. Have only one Channel different solutions the interval of 15 seconds exists with the provided branch name the too! Motion Guides Slides serial monitor on both the Gateway to Thingspeak server after a of...
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