ESP-1ch-Gateway/src/ESP-sc-gway.ino

// 1-channel LoRa Gateway for ESP8266
// Copyright (c) 2016-2020 Maarten Westenberg
// Author: Maarten Westenberg (mw12554@hotmail.com)
//
// Based on work done by Thomas Telkamp for Raspberry PI 1-ch gateway and many others.
//
// All rights reserved. This program and the accompanying materials
// are made available under the terms of the MIT License
// which accompanies this distribution, and is available at
// https://opensource.org/licenses/mit-license.php
//
// NO WARRANTY OF ANY KIND IS PROVIDED
//
// The protocols and specifications used for this 1ch gateway: 
// 1. LoRA Specification version V1.0 and V1.1 for Gateway-Node communication
//	
// 2. Semtech Basic communication protocol between Lora gateway and server version 3.0.0
//	https://github.com/Lora-net/packet_forwarder/blob/master/PROTOCOL.TXT
//
// Notes: 
// - Once call hostbyname() to get IP for services, after that only use IP
//	 addresses (too many gethost name makes the ESP unstable)
// - Only call yield() in main stream (not for background NTP sync). 
//
// ----------------------------------------------------------------------------------------

#if defined (ARDUINO_ARCH_ESP32) || defined(ESP32)
#	define ESP32_ARCH 1
#	define _PIN_OUT 4										// For ESP32 this pin-out is standard
#elif defined(ARDUINO_ARCH_ESP8266)
	//
#else
#	error "Architecture unknown and not supported"
#endif


// The followion file contains most of the definitions
// used in other files. It should be the first file.
#include "configGway.h"										// contains the configuration data of GWay
#include "configNode.h"										// Contains the personal data of Wifi etc.

#include <Esp.h>											// ESP8266 specific IDE functions
#include <string.h>
#include <stdio.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <cstdlib>
#include <sys/time.h>
#include <cstring>
#include <string>											// C++ specific string functions

#include <SPI.h>											// For the RFM95 bus
#include <TimeLib.h>										// http://playground.arduino.cc/code/time
#include <ArduinoJson.h>
#include <FS.h>												// ESP8266 Specific
#include <WiFiUdp.h>
#include <pins_arduino.h>
#include <gBase64.h>										// https://github.com/adamvr/arduino-base64 (changed the name)

// Local include files
#include "loraModem.h"
#include "loraFiles.h"
#include "oLED.h"

extern "C" {
#	include "lwip/err.h"
#	include "lwip/dns.h"
}

#if (_GATEWAYNODE==1) || (_LOCALSERVER==1)
#	include "AES-128_V10.h"
#endif

// ----------- Specific ESP32 stuff --------------
#if defined(ESP32_ARCH)
#	include <WiFi.h>										// MMM added 20Feb
#	include <ESPmDNS.h>
#	include <SPIFFS.h>

#	if A_SERVER==1
#		include <WebServer.h>								// Standard Webserver for ESP32
#		include <Streaming.h>          						// http://arduiniana.org/libraries/streaming/
		WebServer server(A_SERVERPORT); // MMM added 20Feb
#	endif //A_SERVER

#	if A_OTA==1
//#		include <ESP32httpUpdate.h>							// Not yet available
#		include <ArduinoOTA.h>
#	endif //A_OTA

#	if _WIFIMANAGER==1
#		define ESP_getChipId()   ((uint32_t)ESP.getEfuseMac())
#		include <WiFiManager.h>								// Standard lib for ESP WiFi config through an AP
#	endif //_WIFIMANAGER

// ----------- Specific ESP8266 stuff --------------
#elif defined(ARDUINO_ARCH_ESP8266)
	extern "C" {
#		include "user_interface.h"
#		include "c_types.h"
	}
#	include <ESP8266WiFi.h>									// Which is specific for ESP8266
#	include <ESP8266mDNS.h>

#	if A_SERVER==1
#		include <ESP8266WebServer.h>
#		include <Streaming.h>          						// http://arduiniana.org/libraries/streaming/
		ESP8266WebServer server(A_SERVERPORT);				// Standard IDE lib
#	endif //A_SERVER

#	if A_OTA==1
#		include <ESP8266httpUpdate.h>
#		include <ArduinoOTA.h>
#	endif //A_OTA

#	if _WIFIMANAGER==1						
#		include <WiFiManager.h>								// Library for ESP WiFi config through an AP
#		define ESP_getChipId()   (ESP.getChipId())
#	endif //_WIFIMANAGER

#else
#	error "Architecture not supported"

#endif //ESP_ARCH

#include <DNSServer.h>										// Local DNSserver


// ----------- Declaration of variables --------------

uint8_t debug=1;											// Debug level! 0 is no msgs, 1 normal, 2 extensive
uint8_t pdebug= P_MAIN | P_GUI;								// Initially only MAIN and GUI

#if _GATEWAYNODE==1
#	if _GPS==1
#		include <TinyGPS++.h>
		TinyGPSPlus gps;
		HardwareSerial sGps(1);
#	endif //_GPS
#endif //_GATEWAYNODE

using namespace std;
byte 		currentMode = 0x81;
bool		sx1272 = true;									// Actually we use sx1276/RFM95
uint8_t		MAC_array[6];

// ----------------------------------------------------------------------------
//
// Configure these values only if necessary!
//
// ----------------------------------------------------------------------------

// Set spreading factor (SF7 - SF12)
sf_t sf 			= _SPREADING;
sf_t sfi 			= _SPREADING;							// Initial value of SF

// Set location, description and other configuration parameters
// Defined in ESP-sc_gway.h
//
float lat			= _LAT;									// Configuration specific info...
float lon			= _LON;
int   alt			= _ALT;
char platform[24]	= _PLATFORM; 							// platform definition
char email[40]		= _EMAIL;    							// used for contact email
char description[64]= _DESCRIPTION;							// used for free form description 

// define servers

IPAddress ntpServer;										// IP address of NTP_TIMESERVER
IPAddress ttnServer;										// IP Address of thethingsnetwork server
IPAddress thingServer;										// Only if we use a second (backup) server

WiFiUDP Udp;

time_t startTime = 0;										// The time in seconds since 1970 that the server started. We use this variable since millis() is reset every 50 days...
uint32_t eventTime = 0;										// Timing of _event to change value (or not).
uint32_t sendTime = 0;										// Time that the last message transmitted
uint32_t doneTime = 0;										// Time to expire when CDDONE takes too long
uint32_t statTime = 0;										// last time we sent a stat message to server
uint32_t pullTime = 0;										// last time we sent a pull_data request to server

#define TX_BUFF_SIZE  1024									// Upstream buffer to send to MQTT
#define RX_BUFF_SIZE  1024									// Downstream received from MQTT
#define STATUS_SIZE	  512									// Should(!) be enough based on the static text .. was 1024

#if A_SERVER==1
	uint32_t wwwtime = 0;
#endif
#if NTP_INTR==0
	uint32_t ntptimer = 0;
#endif
#if _GATEWAYNODE==1
	uint16_t frameCount=0;									// We write this to SPIFF file
#endif

// Init the indexes of the data we display on the webpage
// We use this for circular buffers
uint16_t iMoni=0;
uint16_t iSeen=0;
uint16_t iSens=0;

// volatile bool inSPI This initial value of mutex is to be free,
// which means that its value is 1 (!)
// 
int16_t mutexSPI = 1;

// ----------------------------------------------------------------------------
// FORWARD DECLARATIONS
// These forward declarations are done since other .ino fils are linked by the
// compiler/linker AFTER the main ESP-sc-gway.ino file. 
// And espcecially when calling functions with ICACHE_RAM_ATTR the complier 
// does not want this.
// Solution can also be to specify less STRICT compile options in Makefile
// ----------------------------------------------------------------------------

void ICACHE_RAM_ATTR Interrupt_0();
void ICACHE_RAM_ATTR Interrupt_1();

int sendPacket(uint8_t *buf, uint8_t length);							// _txRx.ino forward

void printIP(IPAddress ipa, const char sep, String & response);			// _wwwServer.ino
void setupWWW();														// _wwwServer.ino forward

void mPrint(String txt);												// _utils.ino
int getNtpTime(time_t *t);												// _utils.ino
int mStat(uint8_t intr, String & response);								// _utils.ini
void SerialStat(uint8_t intr);											// _utils.ino
void printHexDigit(uint8_t digit, String & response);					// _utils.ino
int inDecodes(char * id);												// _utils.ino
static void stringTime(time_t t, String & response);					// _urils.ino

int initMonitor(struct moniLine *monitor);								// _loraFiles.ino
void initConfig(struct espGwayConfig *c);								// _loraFiles.ino
int writeSeen(const char *fn, struct nodeSeen *listSeen);				// _loraFiles.ino
int readGwayCfg(const char *fn, struct espGwayConfig *c);				// _loraFiles.ino

void init_oLED();														// _oLED.ino
void acti_oLED();														// _oLED.ino
void addr_oLED();														// _oLED.ino
void msg_oLED(String mesg);												// _oLED.ino

void setupOta(char *hostname);											// _otaServer.ino

void initLoraModem();													// _loraModem.ino
void rxLoraModem();														// _loraModem.ino
void writeRegister(uint8_t addr, uint8_t value);						// _loraModem.ino
void cadScanner();														// _loraModem.ino
void startReceiver();													// _loraModem.ino

void stateMachine();													// _stateMachine.ino

bool connectUdp();														// _udpSemtech.ino
int readUdp(int packetSize);											// _udpSemtech.ino
int sendUdp(IPAddress server, int port, uint8_t *msg, int length);		// _udpSemtech.ino
void sendstat();														// _udpSemtech.ino
void pullData();														// _udpSemtech.ino

#if _MUTEX==1
	void ICACHE_FLASH_ATTR CreateMutux(int *mutex);
	bool ICACHE_FLASH_ATTR GetMutex(int *mutex);
	void ICACHE_FLASH_ATTR ReleaseMutex(int *mutex);
#endif



// ============================================================================
// MAIN PROGRAM CODE (SETUP AND LOOP)


// ----------------------------------------------------------------------------
// Setup code (one time)
// _state is S_INIT
// ----------------------------------------------------------------------------
void setup() {

	char MAC_char[19];										// XXX Unbelievable
	MAC_char[18] = 0;
	char hostname[12];										// hostname space

#	if _DUSB>=1
		Serial.begin(_BAUDRATE);							// As fast as possible for bus
		delay(500);
		Serial.flush();
#	endif //_DUSB


#	if OLED>=1
		init_oLED();										// When done display "STARTING" on OLED
#	endif //OLED

#	if _GPS==1
		// Pins are defined in LoRaModem.h together with other pins
		sGps.begin(9600, SERIAL_8N1, GPS_TX, GPS_RX);			// PIN 12-TX 15-RX
#	endif //_GPS

	delay(500);

	if (SPIFFS.begin()) {
#		if _MONITOR>=1
		if ((debug>=1) && (pdebug & P_MAIN)) {
			mPrint("SPIFFS begin");
		}
#		endif //_MONITOR
	}
	else {											// SPIFFS not found
		if (pdebug & P_MAIN) {
			mPrint("SPIFFS.begin: not found, formatting");
		}
		msg_oLED("FORMAT");
		SPIFFS.format();
		delay(500);
		initConfig(&gwayConfig);
	}
	
	// If we set SPIFFS_FORMAT in 
#	if _SPIFFS_FORMAT>=1
	msg_oLED("FORMAT");
	SPIFFS.format();										// Normally disabled. Enable only when SPIFFS corrupt
	delay(500);
	initConfig(&gwayConfig);
	if ((debug>=1) && (pdebug & P_MAIN)) {
		mPrint("Format SPIFFS Filesystem Done");
	}
#	endif //_SPIFFS_FORMAT>=1

#	if _MONITOR>=1
		msg_oLED("MONITOR");
		initMonitor(monitor);
		
#		if defined CFG_noassert
			mPrint("No Asserts");
#		else
			mPrint("Do Asserts");
#		endif //CFG_noassert
#	endif //_MONITOR

	delay(500);
	
	// Read the config file for all parameters not set in the setup() or configGway.h file
	// This file should be read just after SPIFFS is initializen and before
	// other configuration parameters are used.
	//
	if (readGwayCfg(CONFIGFILE, &gwayConfig) > 0) {			// read the Gateway Config
#		if _MONITOR>=1
		if (debug>=0) {
			mPrint("readGwayCfg:: return OK");
		}
#		endif
	}
	else {
#		if _MONITOR>=1
		if (debug>=0) {
			mPrint("setup:: readGwayCfg: ERROR readCfgCfg Failed");
		}
#		endif	
	};							

	delay(500);
	yield();

#	if _WIFIMANAGER==1
	msg_oLED("WIFIMGR");
#	if MONITOR>=1
		mPrint("setup:: WiFiManager");
#	endif
	delay(500);
	
	wifiMgr();
#	endif //_WIFIMANAGER

	msg_oLED("WIFI STA");
	WiFi.mode(WIFI_STA);									// WiFi settings for connections
	WiFi.setAutoConnect(true);
	WiFi.macAddress(MAC_array);
    sprintf(MAC_char,"%02x:%02x:%02x:%02x:%02x:%02x",
		MAC_array[0],MAC_array[1],MAC_array[2],MAC_array[3],MAC_array[4],MAC_array[5]);

#	if _MONITOR>=1
		mPrint("MAC: " + String(MAC_char) + ", len=" + String(strlen(MAC_char)) );
#	endif //_MONITOR


	// Setup WiFi UDP connection. Give it some time and retry x times. '0' means try forever
	while (WlanConnect(0) <= 0) {
#		if _MONITOR>=1
		if ((debug>=0) && (pdebug & P_MAIN)) {
			mPrint("setup:: Error Wifi network connect(0)");
		}
#		endif //_MONITOR
		yield();
	}

#	if _MONITOR>=1
	if ((debug>=1) & ( pdebug & P_MAIN )) {
		mPrint("setup:: WlanConnect="+String(WiFi.SSID()) );
	}
#	endif
	
	// After there is a WiFi router connection, we set the hostname with last 3 bytes of MAC address.
#	if defined(ESP32_ARCH)
		// ESP32
		sprintf(hostname, "%s%02x%02x%02x", "esp32-", MAC_array[3], MAC_array[4], MAC_array[5]);
		WiFi.setHostname(hostname);
		MDNS.begin(hostname);
#	else
		//ESP8266
		sprintf(hostname, "%s%02x%02x%02x", "esp8266-", MAC_array[3], MAC_array[4], MAC_array[5]);
		wifi_station_set_hostname(hostname);
#	endif	//ESP32_ARCH

#	if _MONITOR>=1
	if (debug>=0) {
		String response = "Host=";
#		if defined(ESP32_ARCH)
			response += String(WiFi.getHostname());
#		else
			response += String(wifi_station_get_hostname());
#		endif //ESP32_ARCH

		response += " WiFi Connected to " + String(WiFi.SSID());
		response += " on IP=" + String(WiFi.localIP().toString() );
		mPrint(response);
	} 
#	endif //_MONITOR

	delay(500);
	// If we are here we are connected to WLAN
	
#	if defined(_UDPROUTER)
		// So now test the UDP function
		if (!connectUdp()) {
#			if _MONITOR>=1
				mPrint("Error connectUdp");
#			endif //_MONITOR
		}
#	elif defined(_TTNROUTER)
		if (!connectTtn()) {
#			if _MONITOR>=1
				mPrint("Error connectTtn");
#			endif //_MONITOR
		}
#	else
#		if _MONITOR>=1
			mPrint(F("Setup:: ERROR, No UDP or TCP Connection"));
#		endif //_MONITOR	
#	endif //_UDPROUTER

	delay(200);
	
	// Pins are defined and set in loraModem.h
    pinMode(pins.ss, OUTPUT);
	pinMode(pins.rst, OUTPUT);
    pinMode(pins.dio0, INPUT);								// This pin is interrupt
	pinMode(pins.dio1, INPUT);								// This pin is interrupt
	//pinMode(pins.dio2, INPUT);							// XXX future expansion

	// Init the SPI pins
#if defined(ESP32_ARCH)
	SPI.begin(SCK, MISO, MOSI, SS);
#else
	SPI.begin();
#endif //ESP32_ARCH

	delay(500);
	
	// We choose the Gateway ID to be the Ethernet Address of our Gateway card
    // display results of getting hardware address
	//
#	if _MONITOR>=1
	if (debug>=0) {
		String response= "Gateway ID: ";
		printHexDigit(MAC_array[0], response);
		printHexDigit(MAC_array[1], response);
		printHexDigit(MAC_array[2], response);
		printHexDigit(0xFF,			response);
		printHexDigit(0xFF,			response);
		printHexDigit(MAC_array[3], response);
		printHexDigit(MAC_array[4], response);
		printHexDigit(MAC_array[5], response);

		response += ", Listening at SF" + String(sf) + " on ";
		response += String((double)freqs[gwayConfig.ch].upFreq/1000000) + " MHz.";
		mPrint(response);
	}
#	endif //_MONITOR

	// ---------- TIME -------------------------------------
	msg_lLED("GET TIME",".");
	ntpServer = resolveHost(NTP_TIMESERVER, 15);
	if (ntpServer.toString() == "0:0:0:0")	{					// MMM Experimental
#		if _MONITOR>=1
			mPrint("setup:: NTP Server not found, found="+ntpServer.toString());
#		endif
		delay(10000);											// Delay 10 seconds
		ntpServer = resolveHost(NTP_TIMESERVER, 10);
	}

	// Set the NTP Time
	// As long as the time has not been set we try to set the time.
#	if NTP_INTR==1
		setupTime();											// Set NTP time host and interval
		
#	else //NTP_INTR
	{
		// If not using the standard libraries, do manual setting
		// of the time. This method works more reliable than the 
		// interrupt driven method.
		String response = ".";
		while (timeStatus() == timeNotSet) {					// time still 1/1/1970 and 0:00 hrs

			time_t newTime;
			if (getNtpTime(&newTime)<=0) {
#				if _MONITOR>=1
				if (debug>=0) {
					mPrint("setup:: ERROR Time not set (yet). Time="+String(newTime) );
				}
#				endif //_MONITOR
				response += ".";
				msg_lLED("GET TIME",response);
				delay(800);
				continue;
			}
			response += ".";
			msg_lLED("GET TIME",response);
			delay(1000);
			setTime(newTime);
		}
		
		// When we are here we succeeded in getting the time
		startTime = now();										// Time in seconds
#		if _MONITOR>=1
		if (debug>=0) {
			String response= "Time set=";
			stringTime(now(),response);
			mPrint(response);
		}
#		endif //_MONITOR

		writeGwayCfg(CONFIGFILE, &gwayConfig );
	}
#	endif //NTP_INTR

	delay(100);


	// ---------- TTN SERVER -------------------------------	
#ifdef _TTNSERVER
	ttnServer = resolveHost(_TTNSERVER, 10);					// Use DNS to get server IP
	if (ttnServer.toString() == "0:0:0:0") {					// Experimental
#		if _MONITOR>=1
		if (debug>=1) {
			mPrint("setup:: TTN Server not found");
		}
#		endif
		delay(10000);											// Delay 10 seconds
		ttnServer = resolveHost(_TTNSERVER, 10);
	}	
	delay(100);
#endif //_TTNSERVER



#ifdef _THINGSERVER
	thingServer = resolveHost(_THINGSERVER, 10);				// Use DNS to get server IP
	delay(100);
#endif //_THINGSERVER

	// The Over the Air updates are supported when we have a WiFi connection.
	// The NTP time setting does not have to be precise for this function to work.
#if A_OTA==1
	setupOta(hostname);										// Uses wwwServer 
#endif //A_OTA

	readSeen(_SEENFILE, listSeen);							// read the seenFile records

#if A_SERVER==1	
	// Setup the webserver
	setupWWW();
#endif //A_SERVER

	delay(100);												// Wait after setup
	
	// Setup and initialise LoRa state machine of _loraModem.ino
	_state = S_INIT;
	initLoraModem();
	
	if (gwayConfig.cad) {
		_state = S_SCAN;
		sf = SF7;
		cadScanner();										// Always start at SF7
	}
	else { 
		_state = S_RX;
		rxLoraModem();
	}
	LoraUp.payLoad[0]= 0;
	LoraUp.payLength = 0;									// Init the length to 0

	// init interrupt handlers, which are shared for GPIO15 / D8, 
	// we switch on HIGH interrupts
	if (pins.dio0 == pins.dio1) {
		attachInterrupt(pins.dio0, Interrupt_0, RISING);	// Share interrupts
	}
	// Or in the traditional Comresult case
	else {
		attachInterrupt(pins.dio0, Interrupt_0, RISING);	// Separate interrupts
		attachInterrupt(pins.dio1, Interrupt_1, RISING);	// Separate interrupts		
	}
	
	writeConfig(CONFIGFILE, &gwayConfig);					// Write config
	writeSeen(_SEENFILE, listSeen);							// Write the last time record  is seen

	// activate OLED display
#	if OLED>=1
		acti_oLED();
		addr_oLED();
#	endif //OLED

	mPrint(" --- Setup() ended, Starting loop() ---");

}//setup



// ----------------------------------------------------------------------------
// LOOP
// This is the main program that is executed time and time again.
// We need to give way to the backend WiFi processing that 
// takes place somewhere in the ESP8266 firmware and therefore
// we include yield() statements at important points.
//
// Note: If we spend too much time in user processing functions
// and the backend system cannot do its housekeeping, the watchdog
// function will be executed which means effectively that the 
// program crashes.
// We use yield() a lot to avoid ANY watch dog activity of the program.
//
// NOTE2: For ESP make sure not to do large array declarations in loop();
// ----------------------------------------------------------------------------
void loop ()
{
	int packetSize;
	uint32_t nowSeconds = now();
	
	// check for event value, which means that an interrupt has arrived.
	// In this case we handle the interrupt ( e.g. message received)
	// in userspace in loop().
	//
	stateMachine();											// do the state machine
	
	// After a quiet period, make sure we reinit the modem and state machine.
	// The interval is in seconds (about 15 seconds) as this re-init
	// is a heavy operation. 
	// So it will kick in if there are not many messages for the gateway.
	// Note: Be careful that it does not happen too often in normal operation.
	//
	if ( ((nowSeconds - statr[0].tmst) > _MSG_INTERVAL ) &&
		(msgTime <= statr[0].tmst) ) 
	{
#		if _MONITOR>=1
		if (( debug>=2 ) && ( pdebug & P_MAIN )) {
			String response="";
			response += "REINIT:: ";
			response += String( _MSG_INTERVAL );
			response += (" ");
			mStat(0, response);
			mPrint(response);
		}
#		endif //_MONITOR

		yield();											// Allow buffer operations to finish

		if ((gwayConfig.cad) || (gwayConfig.hop)) {
			_state = S_SCAN;
			sf = SF7;
			cadScanner();
		}
		else {
			_state = S_RX;
			rxLoraModem();
		}
		writeRegister(REG_IRQ_FLAGS_MASK, (uint8_t) 0x00);
		writeRegister(REG_IRQ_FLAGS, (uint8_t) 0xFF);		// Reset all interrupt flags
		msgTime = nowSeconds;
	}

#if A_SERVER==1
	// Handle the Web server part of this sketch. Mainly used for administration 
	// and monitoring of the node. This function is important so it is called at the
	// start of the loop() function.
	yield();
	server.handleClient();
#endif //A_SERVER

#if A_OTA==1
	// Perform Over the Air (OTA) update if enabled and requested by user.
	// It is important to put this function early in loop() as it is
	// not called frequently but it should always run when called.
	//
	yield();
	ArduinoOTA.handle();
#endif //A_OTA

	// If event is set, we know that we have a (soft) interrupt.
	// After all necessary web/OTA services are scanned, we will
	// reloop here for timing purposes. 
	// Do as less yield() as possible.
	// XXX 180326
	if (_event == 1) {
		return;
	}
	else yield();

	
	// If we are not connected, try to connect.
	// We will not read Udp in this loop cycle then
	if (WlanConnect(1) < 0) {
#		if _MONITOR>=1
		if (( debug >= 0 ) && ( pdebug & P_MAIN )) {
			mPrint("loop:: ERROR reconnect WLAN");
		}
#		endif //_MONITOR
		yield();
		return;												// Exit loop if no WLAN connected
	} //WlanConnect
	
	// So if we are connected 
	// Receive UDP PUSH_ACK messages from server. (*2, par. 3.3)
	// This is important since the TTN broker will return confirmation
	// messages on UDP for every message sent by the gateway. So we have to consume them.
	// As we do not know when the server will respond, we test in every loop.
	//
	else {
		while( (packetSize = Udp.parsePacket()) > 0) {
#			if _MONITOR>=1
			if (debug>=2) {
				mPrint("loop:: readUdp calling");
			}
#			endif //_MONITOR
			// DOWNSTREAM
			// Packet may be PKT_PUSH_ACK (0x01), PKT_PULL_ACK (0x03) or PKT_PULL_RESP (0x04)
			// This command is found in byte 4 (buffer[3])
			if (readUdp(packetSize) < 0) {
#				if _MONITOR>=1
				if ( debug>=0 )
					mPrint("readUdp ERROR,down returning < 0");
#				endif //_MONITOR
				break;
			}
			// Now we know we succesfully received message from host
			// If return value is 0, we received a NTP message,
			// otherwise a UDP message with other TTN content
			else {
				//_event=1;									// Could be done double if more messages received
			}
		}
	}

	yield();												// on 26/12/2017

	// stat PUSH_DATA message (*2, par. 4)
	//	

    if ((nowSeconds - statTime) >= _STAT_INTERVAL) {		// Wake up every xx seconds
        sendstat();											// Show the status message and send to server
#		if _MONITOR>=1
		if (( debug>=2 ) && ( pdebug & P_MAIN )) {
			mPrint("Send Pushdata sendstat");
		}
#		endif //_MONITOR

		// If the gateway behaves like a node, we do from time to time
		// send a node message to the backend server.
		// The Gateway node emessage has nothing to do with the STAT_INTERVAL
		// message but we schedule it in the same frequency.
		//
#		if _GATEWAYNODE==1
		if (gwayConfig.isNode) {
			// Give way to internal some Admin if necessary
			yield();

			// If the 1ch gateway is a sensor itself, send the sensor values
			// could be battery but also other status info or sensor info

			if (sensorPacket() < 0) {
#				if _MONITOR>=1
				if ((debug>=1) || (pdebug & P_MAIN)) {
					mPrint("sensorPacket: Error");
				}
#				endif// _MONITOR
			}
		}
#		endif//_GATEWAYNODE
		statTime = nowSeconds;
    }
	
	yield();

	
	// send PULL_DATA message (*2, par. 4)
	//
	nowSeconds = now();
    if ((nowSeconds - pullTime) >= _PULL_INTERVAL) {		// Wake up every xx seconds
        pullData();											// Send PULL_DATA message to server
		startReceiver();
		pullTime = nowSeconds;
		
#		if _MONITOR>=1
		if (( debug>=2) && ( pdebug & P_MAIN )) {
			mPrint("ESP-sc-gway:: PULL_DATA message sent");
		}
#		endif //_MONITOR
    }

	
	// If we do our own NTP handling (advisable)
	// We do not use the timer interrupt but use the timing
	// of the loop() itself which is better for SPI
#	if NTP_INTR==0
		// Set the time in a manual way. Do not use setSyncProvider
		//  as this function may collide with SPI and other interrupts
		// Note: It can be that we do not receive a time this loop (no worries)
		yield();
		nowSeconds = now();
		if (nowSeconds - ntptimer >= _NTP_INTERVAL) {
			yield();
			time_t newTime;
			if (getNtpTime(&newTime)<=0) {
#				if _MONITOR>=1
				if (debug>=2) {
					mPrint("loop:: WARNING Time not set (yet). Time="+String(newTime) );
				}
#				endif //_MONITOR
			}
			else {
				setTime(newTime);
				if (year(now()) != 1970) {
#					if _MONITOR>=1
					if ((debug>=1) && (pdebug & P_MAIN)) {
						ntptimer = nowSeconds;					// Do not when year(now())=="1970" beacause of "FORMAT"
					}
#					endif
				}
			}
		}
#	endif//NTP_INTR

}//loop