140 lines
4.1 KiB
C++
140 lines
4.1 KiB
C++
#include <WiFi.h>
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#include <HTTPClient.h>
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#include "Arduino.h"
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#include "heltec.h"
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#include <ArduinoJson.h>
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#include "hr50_fonts.h"
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#include <EasyButton.h>
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#include "config.h"
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// Pin 0 is the built-in upper button
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#define BUTTON_PIN 0
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EasyButton button(BUTTON_PIN);
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// Contruct API calls
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String api_button_long = api_base_url + "/exec_serial";
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String api_button_short = api_base_url + "/exec_shell";
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String api_status_url = api_base_url + "/get_status";
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int first_row = 0;
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int second_row = 24;
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int third_row = 48;
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int left = 0;
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int right = 128;
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String cmd_status = "";
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// milliseconds of button push until count as a long press
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int duration = 1000;
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// This happens when the button will be pressed long
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void long_button_press() {
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cmd_status = send_http_request(api_button_long);
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}
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// This happens when the button will be pressed short
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void short_button_press() {
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cmd_status = send_http_request(api_button_short);
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}
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// Sends a HTTP request to the server and grabs the response
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String send_http_request(String url) {
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HTTPClient http;
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String response = "";
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http.begin(url.c_str());
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// Send HTTP GET request
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int httpResponseCode = http.GET();
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if (httpResponseCode > 0) {
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response = http.getString();
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}
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else {
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printError("HTTPError: " + (String)httpResponseCode);
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}
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http.end();
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return response;
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}
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// Things that need to be done after booting the device
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void setup() {
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// Initialize Heltec display
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Heltec.begin(true /*DisplayEnable Enable*/, false /*LoRa Disable*/, false /*Serial Enable*/);
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Heltec.display->flipScreenVertically();
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Heltec.display->setFont(DialogInput_plain_16);
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// Log into Wifi and wait a bit
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WiFi.begin(ssid, password);
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delay(4000);
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// Initialize the PRG button
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button.begin();
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// attach action to long button press
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button.onPressedFor(duration, long_button_press);
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// attach action to short button press
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button.onPressed(short_button_press);
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}
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// Print error message on the display
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void printError(String err) {
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Heltec.display->clear();
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Heltec.display->setTextAlignment(TEXT_ALIGN_LEFT);
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Heltec.display->drawString(left, second_row, err );
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Heltec.display->display();
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}
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// Extracts data from the server response, formats it
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// and writes it to the OLED
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void print_status_screen(JsonObject status_json) {
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if ( status_json != NULL ) { // and status_json["PTT"].as<String>() != "ERR") {
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String band = status_json["BND"].as<String>();
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String pep = status_json["PEP"].as<String>();
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String avg = status_json["AVG"].as<String>();
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String swr = status_json["SWR"].as<String>();
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String vlt = status_json["VLT"].as<String>();
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String power = pep + "W/" + avg + "W";
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String ptt = status_json["PTT"].as<String>();
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String temp = status_json["TMP"].as<String>();
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String return_msg = status_json["RET"].as<String>();
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// clear the display
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Heltec.display->clear();
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// print left column
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Heltec.display->setTextAlignment(TEXT_ALIGN_LEFT);
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Heltec.display->drawString(left, first_row, band ); // top row
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Heltec.display->drawString(left, second_row, power ); // mid row
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Heltec.display->drawString(left, third_row, return_msg ); // bottom row
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// print right column
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Heltec.display->setTextAlignment(TEXT_ALIGN_RIGHT);
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Heltec.display->drawString(right, first_row, swr ); // top row
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Heltec.display->drawString(right, second_row, ptt ); // mid row
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Heltec.display->drawString(right, third_row, temp ); // bottom row
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Heltec.display->display();
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}
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}
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void loop() {
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//Check WiFi connection status
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if (WiFi.status() == WL_CONNECTED) {
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// read out button state
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button.read();
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// get status data from server
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String response = send_http_request(api_status_url);
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// The server sends the status data as json string
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// This converts the string to a json object
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StaticJsonDocument<200> doc;
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deserializeJson(doc, response);
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JsonObject obj = doc.as<JsonObject>();
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// print data to OLED screen
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print_status_screen(obj);
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// wait a bit
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delay(500);
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}
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else {
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printError("No WiFi!");
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}
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}
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