![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/ESP32-Send-Messages-to-WhatsApp-Remotely-LILYGO-T-SIM7000G.jpg?resize=1200%2C675&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nCompatibility<\/strong><\/p>\n\n\n\n This board supports 2G, LTE CAT-M1, and NB-IoT protocols. You can go to the following links to check if any of these protocols are supported in your country:<\/p>\n\n\n\n Check network protocols supported in your country;<\/a><\/p>\n\n\n\n Check NB-IoT providers in your country.<\/a><\/p>\n<\/div>\n\n\n\n Here’s a high-level overview of how the project works:<\/p>\n\n\n The LILYGO T-SIM7000G is an ESP32 development board with a SIM7000G chip. This adds GPS, GPRS, LTE CAT-M1, and NB-IoT protocols to your board. This means that with this board you can send SMS, get location and time using GPS<\/a>, and connect it to the internet using a SIM card data plan. You can find more information by reading our in-depth guide<\/a>.<\/p>\n\n\n Where to buy the LILYGO T-SIM7000G ESP32?<\/strong><\/p>\n\n\n\n You can use the preceding links or go directly to MakerAdvisor.com\/tools<\/a> to find all the parts for your projects at the best price!<\/p> Compatibility<\/strong><\/p>\n\n\n\n This board supports 2G, LTE CAT-M1, and NB-IoT protocols. You can go to the following links to check if any of these protocols are supported in your country:<\/p>\n\n\n\n Check network protocols supported in your country;<\/a><\/p>\n\n\n\n Check NB-IoT providers in your country.<\/a><\/p>\n<\/div>\n\n\n\n Before proceeding, you need to follow the next two steps:<\/p>\n\n\n\n 1. Insert a nano SIM card into your board;<\/p>\n\n\n 2. Connect the Full Band LTE antenna to the correct antenna port as illustrated in the following image:<\/p>\n\n\n To connect your SIM card to the internet, you need to have your phone plan provider’s APN details<\/strong>. You need the domain name, username, and password.<\/p>\n\n\n\n In my case, I\u2019m using Vodafone Portugal. If you search for “GPRS APN settings” followed by your phone plan provider name, (in my case: \u201cGPRS APN Vodafone Portugal<\/strong>\u201d), you can usually find in a forum or their website all the information that you need.<\/p>\n\n\n\n It might be a bit tricky to find the details if you don\u2019t use a well-known provider. So, you might need to contact them directly.<\/p>\n\n\n\n \u201cWhatsApp Messenger, or simply WhatsApp, is an internationally available American freeware, cross-platform centralized instant messaging and voice-over-IP service owned by Meta Platforms.\u201d It allows you to send messages using your phone\u2019s internet connection, so you can avoid SMS fees.<\/p>\n\n\n\n WhatsApp is free and is available for Android and iOS. Install WhatsApp on your smartphone if you don\u2019t have it already.<\/p>\n\n\n\n To send messages to your WhatsApp account with the ESP32, we\u2019ll use a free API service called CallMeBot service. You can learn more about CallMeBot at the following link:<\/p>\n\n\n\n Basically, it works as a gateway that allows you to send a message to yourself. This can be useful to send alert messages from the ESP32.<\/p>\n\n\n\n All the information about how to send messages using the API, can be found here<\/a>.<\/p>\n\n\n\n Before starting to use the API, you need to get the CallmeBot WhatsApp API key. Follow the next instructions.<\/p>\n\n\n\n Note:<\/strong> if you don’t receive the API key in 2 minutes, please try again after 24hs or double-check the CallMeBot phone number here<\/a>. The WhatsApp message from the bot will contain the API key needed to send messages using the API<\/p>\n\n\n\n To send a message using the CallMeBot API you need to make a request to the following URL (but using your information):<\/p>\n\n\n\n You can learn more by reading the official documentation<\/a>.<\/p>\n\n\n\n The ESP32 communicates with the SIM7000G chip by sending AT commands via serial communication. You don’t need a library, you can simply establish a serial communication with the module and start sending AT commands. <\/p>\n\n\n\n However, it might be more practical to use a library. For example, the TinyGSM<\/a> library knows which commands to send, and how to handle AT responses, and wraps that into the standard Arduino Client interface\u2014that’s the library we’ll use in this tutorial.<\/p>\n\n\n\n Open your Arduino IDE and go to Sketch <\/strong>> Include Library<\/strong> > Manage Libraries<\/strong>. The Library Manager should open. Search for TinyGSM<\/strong>. Select the TinyGSM library by Volodymyr Shymanskyy.<\/p>\n\n\n You also need to install the ArduinoHttpClient <\/strong>library to make HTTPS requests. Search for ArduinoHttpClient<\/strong> and install it.<\/p>\n\n\n Learn more about HTTPS requests with the ESP32: ESP32 HTTPS Requests (Arduino IDE)<\/a><\/p>\n\n\n\n Finally, install the UrlEncode<\/strong> library to encode your messages. Search for UrlEncode <\/strong>and install it.<\/p>\n\n\n The following example code sends a message to your WhatsApp account when the ESP32 first boots. This is a simple example to show you how to send messages. After understanding how it works, the idea is to incorporate it into your projects to send notifications or useful data.<\/p>\n\n\n\n View raw code<\/a><\/p>\n\n\n\n For example, in my case:<\/p>\n\n\n\n Then, open the Serial Monitor at a baud rate of 115200. Press the on-board RST button to restart the board.<\/p>\n\n\n Wait until the board connects to the network (in my case, it may take up to 2 minutes). You should get something similar in your Serial Monitor\u2014see the picture below.<\/p>\n\n\n You can see that it identifies the SIM7000G module and connects to the network successfully.<\/p>\n\n\n\n Finally, it establishes a connection with the CallMeBot API and should return the success response “Text to send: Hello from ESP32! Message queued. You will receive it in a few seconds<\/em>“. If you see something similar in your Arduino IDE Serial Monitor, it means the code is running successfully.<\/p>\n\n\n\n Let’s take a quick look at the parts of the code relevant to this example.<\/p>\n\n\n\n First, you need to define the module you’re using. The library is compatible with many different modules. To use the SIM7000G, include the following line:<\/p>\n\n\n\n Include the TinyGSM<\/span>, ArduinoHttpClient<\/span>, and UrlEncode<\/span> libraries.<\/p>\n\n\n\n Insert the SIM card pin and APN details (in our case, it’s the following APN, user and pass):<\/p>\n\n\n\n Define the server<\/span> (CallMeBot API endpoint) and port<\/span> where you want to make the HTTPS GET request:<\/p>\n\n\n\n Create a TinyGsmClient<\/span> instance:<\/p>\n\n\n\n The following lines set the module baud rate and pinout:<\/p>\n\n\n\n In the setup()<\/span>, you need to include the following instructions to turn on the modem:<\/p>\n\n\n\n Start a serial communication with the modem:<\/p>\n\n\n\n Call the following function to restart the modem:<\/p>\n\n\n\n You can also use the modem.init()<\/span>. The difference between restart()<\/span> and init()<\/span> according to documentation: “restart()<\/span> generally takes longer than init()<\/span> but ensures the module doesn’t have lingering connections”.<\/p>\n\n\n\n You can use the getModemInfo()<\/span> to get information about the modem.<\/p>\n\n\n\n If you’re using the same model, it will print in the Arduino IDE Serial monitor the following information (SIM7000G):<\/p>\n\n\n If your SIM card has a pin, the next command will use the pin and unlock the card:<\/p>\n\n\n\n Next, connect the GPRS using the APN details:<\/p>\n\n\n\n To check if it is connected, you can use the isNetworkConnected()<\/span> method:<\/p>\n\n\n\n You can customize the String message<\/span> with your desired WhatsApp message. We’ll be using the sample text “Hello from ESP32!” and then, we’ll use the urlEncode()<\/span> function to encode it.<\/p>\n\n\n\n Making an HTTPS GET request is easy using the ArduinoHttpClient<\/span> library, you just need to call http.get(url_callmebot)<\/span>.<\/p>\n\n\n\n If the request is successful, it will print the Response status code: 200<\/em> in your Serial Monitor.<\/p>\n\n\n\n The following snippet is for debugging purposes, it prints the response header and content length.<\/p>\n\n\n\n The response body is the actual response from CallMeBot.<\/p>\n\n\n\n The CallMeBot API should reply with the following success response.<\/p>\n\n\n Finally, stop the http connection and disconnect the GPRS modem from the Internet.<\/p>\n\n\n\n That’s it, those are the most relevant code parts of this sketch.<\/p>\n\n\n\n After uploading your code, open the Serial Monitor at a baud rate of 115200 and press the board RST button. It should successfully connect to your network and send the message to WhatsApp.<\/p>\n\n\n Go to your WhatsApp account. After a few seconds, you should receive the ESP32 message.<\/p>\n\n\n In this tutorial, you learned how to use the CallMeBot API with the ESP32 LILYGO T-SIM7000G to send messages to your WhatsApp account. This can be useful to send sensor readings regularly to your account, send a notification when motion is detected, send an alert message when a sensor reading is above or below a certain threshold, and many other applications.<\/p>\n\n\n\n You may also like the following SIM7000G tutorials:<\/p>\n\n\n\n Learn more about the ESP32 with our resources:<\/p>\n\n\n\n Thanks for reading.<\/p>\n","protected":false},"excerpt":{"rendered":" In this project, you’ll learn how to send messages to your WhatsApp account using an ESP32 from anywhere using a SIM card with a data plan. We’ll use the LILYGO … <\/p>\nProject Overview<\/h2>\n\n\n\n
![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/SIM7000G-callmebot-whatsapp-project-overview.png?resize=900%2C888&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n
Introducing the LILYGO T-SIM7000G ESP32<\/h2>\n\n\n\n
![\"LILYGO](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2022\/08\/ESP32-TSIM7000G.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n\n
![](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2017\/10\/header-200.png?w=1200&quality=100&strip=all&ssl=1\")
<\/a><\/p>\n\n\n\nPreparing the LILYGO T-SIM7000G ESP32 Board<\/h3>\n\n\n\n
![\"Nano](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2022\/08\/nano-SIM-card-vodafone.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n![\"SIM](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/SIM7000G-ESP32-SIM-Card-Connected.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Connect](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/SIM7000G-ESP32-Antenna.jpg?resize=750%2C422&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nAPN Details<\/h3>\n\n\n\n
Introducing WhatsApp<\/h2>\n\n\n
![\"WhatsApp](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2022\/09\/Whatsapp-logo.png?resize=200%2C200&quality=100&strip=all&ssl=1\"){kind=logo}
<\/figure><\/div>\n\n\nCallMeBot WhatsApp API<\/h3>\n\n\n\n
\n
Getting the CallMeBot API KEY<\/h3>\n\n\n\n
\n
![\"Get](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2022\/09\/Get-CallMeBot-API-Key.png?resize=350%2C458&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nCallMeBot API<\/h3>\n\n\n\n
https:\/\/api.callmebot.com\/whatsapp.php?phone=[phone_number]<\/strong>&text=[message]<\/strong>&apikey=[your_apikey]<\/strong><\/pre>\n\n\n\n
\n
\n
\n
Libraries<\/h2>\n\n\n\n
Installing the TinyGSM Library<\/h4>\n\n\n\n
![\"Arduino](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Arduino-IDE-2-Install-TinyGSM-Library-using-Libraries-Manager-1.png?resize=278%2C307&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nInstalling the ArduinoHttpClient Library<\/h4>\n\n\n\n
![\"Arduino](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Arduino-IDE-2-Install-ArduinoHttpClient-Library-using-Libraries-Manager.png?resize=281%2C288&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nInstalling the UrlEncode Library<\/h4>\n\n\n\n
![\"Arduino](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Arduino-IDE-2-Install-URLEncode-Library-using-Libraries-Manager.png?resize=274%2C291&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nSending Messages using SIM Card to WhatsApp – LILYGO T-SIM7000G ESP32 Code<\/h2>\n\n\n\n
\n
\/*\n Rui Santos & Sara Santos - Random Nerd Tutorials\n Complete project details at https:\/\/RandomNerdTutorials.com\/esp32-send-messages-whatsapp-sim7000g\/\n \n Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.\n The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. Based on the library example: github.com\/vshymanskyy\/TinyGSM\/blob\/master\/examples\/HttpsClient\/HttpsClient.ino\n*\/\n\n\/\/ Select your modem\n#define TINY_GSM_MODEM_SIM7000SSL\n#define TINY_GSM_RX_BUFFER 1024 \/\/ Set RX buffer to 1Kb\n\n\/\/ Set serial for debug console (to the Serial Monitor, default speed 115200)\n#define SerialMon Serial\n#define SerialAT Serial1\n\n#include <TinyGsmClient.h>\n#include <ArduinoHttpClient.h>\n#include <UrlEncode.h>\n\n\/\/ Define the serial console for debug prints, if needed\n#define TINY_GSM_DEBUG SerialMon\n\/\/ #define LOGGING \/\/ <- Logging is for the HTTP library\n\n\/\/ Add a reception delay, if needed.\n\/\/ This may be needed for a fast processor at a slow baud rate.\n\/\/ #define TINY_GSM_YIELD() { delay(2); }\n\n\/\/ set GSM PIN, if any\n#define GSM_PIN ""\n\n\/\/ flag to force SSL client authentication, if needed\n\/\/ #define TINY_GSM_SSL_CLIENT_AUTHENTICATION\n\n\/\/ Set your APN Details \/ GPRS credentials\nconst char apn[] = "";\nconst char gprsUser[] = "";\nconst char gprsPass[] = "";\n\n\/\/ Server details\nconst char server[] = "api.callmebot.com";\nconst int port = 443;\n\n\/\/ The phone number should be in international format (including the + sign)\nString phone_number = "REPLACE_WITH_YOUR_PHONE_NUMBER";\nString api_key = "REPLACE_WITH_YOUR_API_KEY";\n\nTinyGsm modem(SerialAT);\n\nTinyGsmClientSecure client(modem);\nHttpClient http(client, server, port);\n\n\/\/ LilyGO T-SIM7000G Pinout\n#define UART_BAUD 115200\n#define PIN_DTR 25\n#define PIN_TX 27\n#define PIN_RX 26\n#define PWR_PIN 4\n\n#define SD_MISO 2\n#define SD_MOSI 15\n#define SD_SCLK 14\n#define SD_CS 13\n#define LED_PIN 12\n\nvoid modemPowerOn(){\n pinMode(PWR_PIN, OUTPUT);\n digitalWrite(PWR_PIN, LOW);\n delay(1000);\n digitalWrite(PWR_PIN, HIGH);\n}\n\nvoid modemPowerOff(){\n pinMode(PWR_PIN, OUTPUT);\n digitalWrite(PWR_PIN, LOW);\n delay(1500);\n digitalWrite(PWR_PIN, HIGH);\n}\n\nvoid modemRestart(){\n modemPowerOff();\n delay(1000);\n modemPowerOn();\n}\n\nvoid setup() {\n \/\/ Set Serial Monitor baud rate\n SerialMon.begin(115200);\n delay(10);\n\n \/\/ Set LED OFF\n pinMode(LED_PIN, OUTPUT);\n digitalWrite(LED_PIN, HIGH);\n\n modemPowerOn();\n\n SerialMon.println("Wait...");\n\n \/\/ Set GSM module baud rate and Pins\n SerialAT.begin(UART_BAUD, SERIAL_8N1, PIN_RX, PIN_TX);\n delay(6000);\n\n \/\/ Restart takes quite some time\n \/\/ To skip it, call init() instead of restart()\n SerialMon.println("Initializing modem...");\n modem.restart();\n \/\/ modem.init();\n\n String modemInfo = modem.getModemInfo();\n SerialMon.print("Modem Info: ");\n SerialMon.println(modemInfo);\n\n \/\/ Unlock your SIM card with a PIN if needed\n if (GSM_PIN && modem.getSimStatus() != 3) {\n modem.simUnlock(GSM_PIN);\n }\n\n Serial.println("Make sure your LTE antenna has been connected to the SIM interface on the board.");\n delay(10000);\n}\n\nvoid loop() {\n modem.gprsConnect(apn, gprsUser, gprsPass);\n\n SerialMon.print("Waiting for network...");\n if (!modem.waitForNetwork()) {\n SerialMon.println(" fail");\n delay(10000);\n return;\n }\n SerialMon.println(" success");\n\n if (modem.isNetworkConnected()) {\n SerialMon.println("Network connected");\n }\n\n String message = "Hello from ESP32!";\n String url_callmebot = "\/whatsapp.php?phone=" + phone_number + "&apikey=" + api_key + "&text=" + urlEncode(message);\n\n SerialMon.print(F("Performing HTTPS GET request... "));\n http.connectionKeepAlive(); \/\/ Currently, this is needed for HTTPS\n\n int err = http.get(url_callmebot);\n if (err != 0) {\n SerialMon.println(F("failed to connect"));\n delay(10000);\n return;\n }\n\n int status = http.responseStatusCode();\n SerialMon.print(F("Response status code: "));\n SerialMon.println(status);\n if (!status) {\n delay(10000);\n return;\n }\n\n SerialMon.println(F("Response Headers:"));\n while (http.headerAvailable()) {\n String headerName = http.readHeaderName();\n String headerValue = http.readHeaderValue();\n SerialMon.println(" " + headerName + " : " + headerValue);\n }\n\n int length = http.contentLength();\n if (length >= 0) {\n SerialMon.print(F("Content length is: "));\n SerialMon.println(length);\n }\n if (http.isResponseChunked()) {\n SerialMon.println(F("The response is chunked"));\n }\n\n String body = http.responseBody();\n SerialMon.println(F("Response:"));\n SerialMon.println(body);\n\n SerialMon.print(F("Body length is: "));\n SerialMon.println(body.length());\n\n \/\/ Shutdown\n http.stop();\n SerialMon.println(F("Server disconnected"));\n\n modem.gprsDisconnect();\n SerialMon.println(F("GPRS disconnected"));\n\n \/\/ Do nothing forevermore\n while (true) {\n delay(1000);\n }\n}\n<\/code><\/pre>\n\t#define GSM_PIN \"\"<\/code><\/pre>\n\n\n\n\/\/ Set your APN Details \/ GPRS credentials\nconst char apn[] = \"\";\nconst char gprsUser[] = \"\";\nconst char gprsPass[] = \"\";<\/code><\/pre>\n\n\n\nconst char apn[] = \"net2.vodafone.pt\";\nconst char gprsUser[] = \"vodafone\";\nconst char gprsPass[] = \"vodafone\";<\/code><\/pre>\n\n\n\nString phone_number = \"REPLACE_WITH_YOUR_PHONE_NUMBER\";\nString api_key = \"REPLACE_WITH_YOUR_API_KEY\";<\/code><\/pre>\n\n\n\n![\"Arduino](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Arduino-IDE-2-Select-ESP32-Dev-Module-Board-and-COM-Port.png?resize=670%2C479&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Arduino](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Arduino-2-Compile-and-Upload-Sketch-button.png?resize=41%2C37&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Arduino](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Arduino-2-Open-Serial-Monitor-Button.png?resize=37%2C32&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\n![\"Demonstration](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Demonstration-Arduino-IDE-2-Serial-Monitor-ESP32-Send-Message-to-WhatsApp-Remotely-LILYGO-T-SIM7000G.png?resize=1074%2C561&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nHow the Code Works<\/h2>\n\n\n\n
SIM Module<\/h3>\n\n\n\n
#define TINY_GSM_MODEM_SIM7000SSL<\/code><\/pre>\n\n\n\nLibraries<\/h3>\n\n\n\n
#include <TinyGsmClient.h>\n#include <ArduinoHttpClient.h>\n#include <UrlEncode.h><\/code><\/pre>\n\n\n\nAPN Details<\/h3>\n\n\n\n
\/\/ set GSM PIN, if any\n#define GSM_PIN \"\"\n\n\/\/ Set your APN Details \/ GPRS credentials\nconst char apn[] = \"net2.vodafone.pt\";\nconst char gprsUser[] = \"vodafone\";\nconst char gprsPass[] = \"vodafone\";<\/code><\/pre>\n\n\n\nServer Domain and Resource<\/h3>\n\n\n\n
\/\/ Server details\nconst char server[] = \"api.callmebot.com\";\nconst int port = 443;<\/code><\/pre>\n\n\n\nInitialize TinyGSMClient<\/h3>\n\n\n\n
TinyGsm modem(SerialAT);\n\nTinyGsmClientSecure client(modem);\n\nHttpClient http(client, server, port);<\/code><\/pre>\n\n\n\nSIM7000G pinout<\/h3>\n\n\n\n
#define UART_BAUD 115200\n#define PIN_DTR 25\n#define PIN_TX 27\n#define PIN_RX 26\n#define PWR_PIN 4\n\n#define SD_MISO 2\n#define SD_MOSI 15\n#define SD_SCLK 14\n#define SD_CS 13\n#define LED_PIN 12<\/code><\/pre>\n\n\n\nPower the modem<\/h3>\n\n\n\n
pinMode(PWR_PIN, OUTPUT);\ndigitalWrite(PWR_PIN, HIGH);\ndelay(300);\ndigitalWrite(PWR_PIN, LOW);<\/code><\/pre>\n\n\n\nStart Serial Communication<\/h3>\n\n\n\n
SerialAT.begin(UART_BAUD, SERIAL_8N1, PIN_RX, PIN_TX);<\/code><\/pre>\n\n\n\nRestart and Initialize the Modem<\/h3>\n\n\n\n
SerialMon.println(\"Initializing modem...\");\nmodem.restart();<\/code><\/pre>\n\n\n\nGet Modem Info<\/h3>\n\n\n\n
String modemInfo = modem.getModemInfo();\nSerialMon.print(\"Modem Info: \");\nSerialMon.println(modemInfo);<\/code><\/pre>\n\n\n\n![\"Demonstration](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Demonstration-print-modem-info-ESP32-Make-HTTPS-Requests-SIM-Card-LILYGO-T-SIM7000G.png?resize=215%2C23&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nUnlock and Connect GPRS<\/h3>\n\n\n\n
if (GSM_PIN && modem.getSimStatus() != 3) {\n modem.simUnlock(GSM_PIN);\n}<\/code><\/pre>\n\n\n\nmodem.gprsConnect(apn, gprsUser, gprsPass);\n\nSerialMon.print(\"Waiting for network...\");\nif (!modem.waitForNetwork()) {\n SerialMon.println(\" fail\");\n delay(10000);\n return;\n}\nSerialMon.println(\" success\");<\/code><\/pre>\n\n\n\nif (modem.isNetworkConnected()) {\n SerialMon.println(\"Network connected\");\n}<\/code><\/pre>\n\n\n\nConfigure the WhatsApp Message<\/h3>\n\n\n\n
String message = \"Hello from ESP32!\";\nString url_callmebot = \"\/whatsapp.php?phone=\" + phone_number + \"&apikey=\" + api_key + \"&text=\" + urlEncode(message);<\/code><\/pre>\n\n\n\nPerform the HTTPS GET Request<\/h3>\n\n\n\n
SerialMon.print(F(\"Performing HTTPS GET request... \"));\nhttp.connectionKeepAlive(); \/\/ Currently, this is needed for HTTPS\n\nint err = http.get(url_callmebot);\nif (err != 0) {\n SerialMon.println(F(\"failed to connect\"));\n delay(10000);\n return;\n}<\/code><\/pre>\n\n\n\nint status = http.responseStatusCode();\nSerialMon.print(F(\"Response status code: \"));\nSerialMon.println(status);\nif (!status) {\n delay(10000);\n return;\n}<\/code><\/pre>\n\n\n![\"Demonstration](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Demonstration-Response-code-200-ESP32-Make-HTTPS-Requests-SIM-Card-LILYGO-T-SIM7000G.png?resize=456%2C26&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nSerialMon.println(F(\"Response Headers:\"));\nwhile (http.headerAvailable()) {\n String headerName = http.readHeaderName();\n String headerValue = http.readHeaderValue();\n SerialMon.println(\" \" + headerName + \" : \" + headerValue);\n}\n\nint length = http.contentLength();\nif (length >= 0) {\n SerialMon.print(F(\"Content length is: \"));\n SerialMon.println(length);\n}\nif (http.isResponseChunked()) {\n SerialMon.println(F(\"The response is chunked\"));\n}<\/code><\/pre>\n\n\n![\"Demonstration](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Demonstration-Arduino-IDE-2-Serial-Monitor-HTTPS-Response-Header-Remotely-LILYGO-T-SIM7000G.png?resize=485%2C197&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nString body = http.responseBody();\nSerialMon.println(F(\"Response:\"));\nSerialMon.println(body);\n\nSerialMon.print(F(\"Body length is: \"));\nSerialMon.println(body.length());<\/code><\/pre>\n\n\n\n![\"Arduino](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/Arduino-IDE-2-Serial-Monitor-ESP32-Send-Test-Message-to-WhatsApp-Remotely-LILYGO-T-SIM7000G.png?resize=991%2C54&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nhttp.stop();\nSerialMon.println(F(\"Server disconnected\"));\n\nmodem.gprsDisconnect();\nSerialMon.println(F(\"GPRS disconnected\"));<\/code><\/pre>\n\n\n\nDemonstration<\/h2>\n\n\n\n
<\/figure><\/div>\n\n\n![\"ESP32](\"https:\/\/i0.wp.com\/randomnerdtutorials.com\/wp-content\/uploads\/2024\/02\/ESP32-Send-Test-Message-to-WhatsApp-Remotely-LILYGO-T-SIM7000G.png?resize=750%2C509&quality=100&strip=all&ssl=1\")
<\/figure><\/div>\n\n\nWrapping Up<\/h2>\n\n\n\n
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