Got a project using ESP32 with SIM7600E 4g LTE module, and im trying to get it to send data to firebase realtime database. i can get it to successfully initialise and connect to cellular network. ive tested it sending sms and pining other servers. Whenever I try to post something to the database ,i get something like +HTTP_PEER_CLOSED. i thought this was because firebase was rejecting http requests, so i tried sending it as a HTTPS request, and failed at this too. Honestly been stuck on this for a week and could use some help really badly
#include <Arduino.h>#include <HardwareSerial.h>const long Baudrate = 115200;const char RX_Pin = 16;const char TX_Pin = 17;HardwareSerial sim(1);void command(String command, unsigned long timeout = 1000) { sim.println(command); unsigned long startTime = millis(); while (millis() - startTime < timeout) { if (sim.available()) { String response = sim.readString(); Serial.println(response); break; } }}void SetHTTPS() { command("");}void upload() { command("AT+CSSLCFG=\"sslversion\",0,3"); command("AT+CSSLCFG=\"ignorelocaltime\",0,1"); command("AT+CSSLCFG=\"seclevel\",0,0"); command("AT+HTTPINIT", 5000); command("AT+HTTPPARA=\"URL\",\"https://DB-URL-STUFF.firebasedatabase.app/test.json?auth=AUTH-KEY\""); command("AT+HTTPPARA=\"CONTENT\",\"application/json\""); sim.println("AT+HTTPDATA=35,10000"); delay(3000); if (sim.available()) { String response = sim.readString(); if (response.indexOf("DOWNLOAD") != -1) { Serial.println("Sending JSON..."); sim.println("{\"message\":\"test from SIM7600\"}"); delay(1000); sim.write(26); delay(2000); } } command("AT+HTTPACTION?"); command("AT+HTTPACTION=1", 5000); command("AT+HTTPREAD"); command("AT+HTTPTERM");}void setup() { Serial.begin(115200); sim.begin(Baudrate, SERIAL_8N1, RX_Pin, TX_Pin); command("AT"); // test stuff command("ATI"); // module status stuff command("AT+CSQ"); // signal command("AT+CGDCONT=1,\"IP\",\"everywhere\""); command("AT+CGATT=1"); command("AT+CGACT=1,1"); command("AT+NETOPEN"); delay(100); upload();}void loop() { while (sim.available()) { Serial.write(sim.read()); }}Output
ATOKATIManufacturer: SIMCOM INCORPORATEDModel: SIMCOM_SIM7600E-L1CRevision: SIM7600M11_A_V2.0.1IMEI: 862499070415105+GCAP: +CGSMOKAT+CSQ+CSQ: 15,99OKAT+CGDCONT=1,"IP","everywhere"OKAT+CGATT=1OKAT+CGACT=1,1OKAT+NETOPEN+IP ERROR: Network is already openedERRORAT+CSSLCFG="sslversion",0,3OKAT+CSSLCFG="ignorelocaltime",0,1OKAT+CSSLCFG="seclevel",0,2ERRORAT+HTTPINITOKAT+HTTPPARA="URL","https://DB-URL-STUFF.firebasedatabase.app/test.json?auth=AUTH-KEY"OKAT+HTTPPARA="CONTENT","application/json"OKSending JSON...{"message":"test from SIM7600"}AOKAT+HTTPACTION=1OK+HTTPACTION: 1,400,77AT+HTTPREADERRORAT+HTTPTERMOK
