Hallo Leute,
meine Agenda:
Ich hab ein esp8266 der von dem sds011 FeinstaubSensor Daten bekommt. Der esp8266 soll die Daten an einem Raspberry Pi Router verschicken, der wiederum diese Daten an einem anderen Raspberry Pi, welcher als Webserver eingerichtet wird, senden.
Also quasi:
SDS011+ESP8266 ->Daten-> Raspirouter->Daten->RaspiWebserver
Ich habe im Internet recherchiert und nichts konnte mein Verständnis helfen.
Welche Möglichkeiten gibt es?
Habt ihr da paar Denkanstöße?
vielen Dank!!
du könntest mit dem ESP8266 mittels HTTP Client an den RaspiWebserver senden.
IDE Beispiel ESP8266HTTPClient / PostHTTPClient.ino
am RaspiWebserver z.B. mittels PHP übernehmen
Hier habe ich mal ein paar Denkanstöße in 4 Teilen gegeben:
[url]https://werner.rothschopf.net/202009_iot_webserver_intro.htm[/url]
Hier ist ein Demo-code der einern String per UDP sendet.
Auf dem Raspi läuft dann das Python-Script das am Ende in Blockkommentarklammern steht
// I wrote some basic documentation at the end of the file
#include <ESP8266WiFi.h>
#include <WiFiUdp.h>
#include <PString.h>
#include <time.h> // time() ctime()
char *ssid = "FRITZ!Box 7490";
char *password = "";
IPAddress remoteIP (192, 168, 178, 160); // receiver-IP
unsigned int remotePort = 4210; // receiver port to listen on must match the portnumber the receiver is listening to
WiFiUDP Udp;
const char* ntpServer = "fritz.box";
const long gmtOffset_sec = 0;
const int daylightOffset_sec = 7200;
#include <time.h> // time() ctime()
time_t now; // this is the epoch
tm myTimeInfo; // the structure tm holds time information in a more convient way
boolean TimePeriodIsOver (unsigned long &expireTime, unsigned long TimePeriod) {
unsigned long currentMillis = millis();
if ( currentMillis - expireTime >= TimePeriod )
{
expireTime = currentMillis; // set new expireTime
return true; // more time than TimePeriod) has elapsed since last time if-condition was true
}
else return false; // not expired
}
const byte OnBoard_LED = 2;
int BlinkTime = 500;
void BlinkHeartBeatLED(int IO_Pin, int BlinkPeriod) {
static unsigned long MyBlinkTimer;
pinMode(IO_Pin, OUTPUT);
if ( TimePeriodIsOver(MyBlinkTimer, BlinkPeriod) ) {
digitalWrite(IO_Pin, !digitalRead(IO_Pin) );
}
}
unsigned long TestTimer;
unsigned long UDP_SendTimer;
int myCounter = 0;
int HeaderNr = 0;
#define MaxMsgLength 1024
char UDP_Msg_AoC[MaxMsgLength + 1]; // always remember one extra-char for terminating zero
PString UDP_Msg_PS(UDP_Msg_AoC, sizeof(UDP_Msg_AoC));
uint8_t UDP_Msg_uint8_Buffer[MaxMsgLength + 1]; // for some strange reasons on ESP32 the udp.write-function needs an uint8_t-array
#define MaxHeaderLength 64
char Header_AoC[MaxHeaderLength + 1]; // always remember one extra-char for terminating zero
PString Header_PS(Header_AoC, sizeof(Header_AoC));
#define MaxTimeStampLength 32
char TimeStamp_AoC[MaxTimeStampLength + 1]; // always remember one extra-char for terminating zero
PString TimeStamp_PS(TimeStamp_AoC, sizeof(TimeStamp_AoC));
char HeaderDelimiter = '$'; // must match the delimiter defined in the python-code
void PrintFileNameDateTime()
{
Serial.print("Code running comes from file ");
Serial.println(__FILE__);
Serial.print(" compiled ");
Serial.print(__DATE__);
Serial.println(__TIME__);
}
void showTime() {
time(&now); // read the current time
localtime_r(&now, &myTimeInfo); // update the structure tm with the current time
Serial.print("year:");
Serial.print(myTimeInfo.tm_year + 1900); // years since 1900
Serial.print("\tmonth:");
Serial.print(myTimeInfo.tm_mon + 1); // January = 0 (!)
Serial.print("\tday:");
Serial.print(myTimeInfo.tm_mday); // day of month
Serial.print("\thour:");
Serial.print(myTimeInfo.tm_hour); // hours since midnight 0-23
Serial.print("\tmin:");
Serial.print(myTimeInfo.tm_min); // minutes after the hour 0-59
Serial.print("\tsec:");
Serial.print(myTimeInfo.tm_sec); // seconds after the minute 0-61*
Serial.print("\twday");
Serial.print(myTimeInfo.tm_wday); // days since Sunday 0-6
if (myTimeInfo.tm_isdst == 1) // Daylight Saving Time flag
Serial.print("\tDST");
else
Serial.print("\tstandard");
Serial.println();
}
// my personal naming-convention parameter of functions start with prefix "p_"
void StoreTimeStampStr(char* p_PointerToTarget, tm p_myTimeInfo) {
char l_TimeStamp_AoC[MaxTimeStampLength + 1]; // always remember one extra-char for terminating zero
PString l_TimeStamp_PS(l_TimeStamp_AoC, sizeof(l_TimeStamp_AoC));
time(&now); // read the current time
localtime_r(&now, &myTimeInfo);
l_TimeStamp_PS = p_myTimeInfo.tm_year + 1900;
l_TimeStamp_PS += ".";
l_TimeStamp_PS += p_myTimeInfo.tm_mon + 1;
l_TimeStamp_PS += ".";
l_TimeStamp_PS += p_myTimeInfo.tm_mday;
l_TimeStamp_PS += ", ";
l_TimeStamp_PS += p_myTimeInfo.tm_hour;
l_TimeStamp_PS += ":";
l_TimeStamp_PS += p_myTimeInfo.tm_min;
l_TimeStamp_PS += ":";
l_TimeStamp_PS += p_myTimeInfo.tm_sec;
l_TimeStamp_PS += ",";
strlcpy(p_PointerToTarget, l_TimeStamp_AoC,l_TimeStamp_PS.length() + 1);
}
void connectToWifi() {
Serial.print("Connecting to ");
Serial.println(ssid);
WiFi.persistent(false);
WiFi.mode(WIFI_STA);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
BlinkHeartBeatLED(OnBoard_LED, 333);
delay(332);
Serial.print(".");
}
Serial.print("\n connected.");
Serial.println(WiFi.localIP() );
}
void synchroniseWith_NTP_Time() {
Serial.print("configTime uses ntpServer ");
Serial.println(ntpServer);
configTime(gmtOffset_sec, daylightOffset_sec, ntpServer);
Serial.print("synchronising time");
while (myTimeInfo.tm_year + 1900 < 2000 ) {
time(&now); // read the current time
localtime_r(&now, &myTimeInfo);
BlinkHeartBeatLED(OnBoard_LED, 100);
delay(100);
Serial.print(".");
}
Serial.print("\n time synchronsized \n");
showTime();
}
void setup() {
Serial.begin(115200);
Serial.println("\n Setup-Start \n");
PrintFileNameDateTime();
connectToWifi();
synchroniseWith_NTP_Time();
Header_PS = "myDemoHeader";
}
void PrintMsg() {
Serial.print("UDP_Msg_PS #");
Serial.print(UDP_Msg_PS);
Serial.println("#");
}
void loop() {
BlinkHeartBeatLED(OnBoard_LED, BlinkTime);
if (TimePeriodIsOver(UDP_SendTimer, 2000) ) {
Serial.print("Send Message to #");
Serial.print(remoteIP);
Serial.print(":");
Serial.println(remotePort);
UDP_Msg_PS = Header_PS;
UDP_Msg_PS += HeaderDelimiter;
UDP_Msg_PS += "myUserData, ";
StoreTimeStampStr(TimeStamp_AoC,myTimeInfo);
UDP_Msg_PS += TimeStamp_PS;
UDP_Msg_PS += myCounter++;
Serial.print("Send UDP_Msg #");
Serial.print(UDP_Msg_PS);
Serial.println("#");
memcpy(UDP_Msg_uint8_Buffer,UDP_Msg_PS,UDP_Msg_PS.length()); // for some strange reason the ESP32 UDP-function write needs an uint8_t-array
Udp.beginPacket(remoteIP, remotePort);
Udp.write(UDP_Msg_uint8_Buffer, UDP_Msg_PS.length() );
Udp.endPacket();
}
}
/*
This is a democode that demonstrates how to send TCP/UDP-messages with a timestamp
The time is synchronized using a NTP-server. Most local routers like Fritz!Box can be used as the NTP-timer-server
The message has a userdefinable header which could be used for identifying the sender on the recieverside
There is a user-definable Header-delimiter that can be used to identify which characters of the
UDP-message belong to the header and which to the userdata
The code makes use of the PString-library. PStrings don't cause memory-problems like datatype "Strings"
and are easier to use than arrays of char. Example adding an integer to a PString-variable is as easy as
MyPString = myInteger;
The userdata has commas between each data so you can import the textfile
into table-calculation-software or databases as CSV-file comma separated values
the code has some additional useful functions as there are
- PrintFileNameDateTime() printing the path and filename of sourcecode file this program was generated with
- boolean TimePeriodIsOver a non-blocking timing-function based on millis which is suitable for
timed execution in a regular manner (repeat every n milliseconds)
- BlinkHeartBeatLED() blinks the onboard-LED of ESP32 nodeMCU-boards. Gives visual feedback if the code is running
The lines of code are grouped by functionality into several functions
The functions name says what the function does
I use this code for easy datalogging on a computer with a python-code that acts as the UDP-listener for
incoming messages. Inside your ESP32-code you have to adjust the IP-adress to the receiver
and the portnumber must be the same on sender (ESP32) and receiver-side
In the python-code The header is used to create a file with the header as filename and extension ".txt" or if file
is already existant to append the actual received UDP-message at the end of the file.
here is the python-code that does this. I tested it with python 3.9.2 for windows
#Start of python-code
# very simple and short upd-receiver based on python-code I found here
# https://www.studytonight.com/network-programming-in-python/working-with-udp-sockets#
import socket
sock = socket.socket(socket.AF_INET,socket.SOCK_DGRAM) # For UDP
udp_host = socket.gethostname() # Host IP
udp_port = 4210 # specified port to connect
sock.bind((udp_host,udp_port))
print ("Waiting for client...")
HeaderDelimitChar = "$"
while True:
data,addr = sock.recvfrom(1024) #receive data from client
print("data #",data,"#")
Msg = data.decode('utf-8')
print ("Received Message: #",Msg,"# from",addr)
EndOfHeader = Msg.find(HeaderDelimitChar)
HeaderBytes = Msg[0:EndOfHeader]
FileName = HeaderBytes + ".txt"
print("Filename #",FileName,"#")
myFile = open(FileName, "a+")
EndOfStr = data.find(0)
MsgToWrite = Msg[EndOfHeader + 1 :1024] + '\r'
myFile.write(MsgToWrite);
myFile.close()
print ("Data #",MsgToWrite,"#")
#End of python-code
For learning more about python just google with keyword "python" "your keyword of interest"
*/vgs
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