231,464 total views, 535 views today

HOYO 的 2020 回顧

Posted on 2020-12-26 by hoyo

公司

富邦銀行的 BEMS 案子褲子都脫了，什麼都沒看到。還好都不會浪費以後還用的到…
使用 ESP8266 進行一些 RS485 Modbus 的通訊測試，在一些特定應用場合異常好用
接手一個外包廠商花了一年半進度還做不到 50% 的需量網頁版系統，自己從頭到尾花了 3 個月就上線使用
因為富邦銀行案子需求開始使用 NanoPi 開發通訊硬體，增加了 Python 以及 Linux 的熟練度
年底的時候因為「班班有冷氣」政策，所有冷氣、電錶相關廠商雞飛狗跳，我們也不例外
開始嘗試使用 MQTT 這個大家都已經用爛的通訊方式，並且花了 3 天將公司提的需量 APP做了一個產品

—

個人

過年的時候終於嘗試了瓦斯爐韓式烤肉，好吃又好玩
暑假的時候一家人去了日月潭、九族文化村，台灣 369 遊樂園終於湊齊了
又是公司出差才第一次去宜蘭，實在是又窮又宅，主要是窮，有錢就到處玩樂了
因為國慶煙火在台南，而且在安平，終於第一次看了台灣的國慶煙火
因為又窮又宅，所以嘗試了使用壓克力顏料進行創作，好玩是好玩就是收捨麻煩
受到神奇 YouTube 演算法，被安麗了一堆健身影片之後開始進行 168 斷食，以及在家做簡單的鍛鍊，

—

2020 代表字

健康、健身、我們下次健

—

263 total views, 8 views today

ESP8266 – RS485 Modbus 通訊

Posted on 2020-12-21 by hoyo

—

MAX485

【MSP430開發日誌】UART延伸應用RS485(MAX485模組) – 前言與準備

最後的腳位對應為

RO => RXD = D5

DI => TXD = D6

TR = D2

—

SoftwareSerial

因為使用了 UART 轉 RS485 小板，因此只要設定好鮑率、傳送的資料及計算 CRC 即可

ESP8266 Two Serial Ports With SoftwareSerial Library

#include <SoftwareSerial.h>

SoftwareSerial mySerial(14, 12); // RX, TX

#define DE 4 // D6使能發送器，高電平有效

void setup()

{

pinMode(not_RE, OUTPUT);

pinMode(DE, OUTPUT);

digitalWrite(not_RE, HIGH); // disable receiver

digitalWrite(DE, HIGH); // enable transmitter

Serial.begin(57600);

mySerial.begin(9600);

}

void loop()

{

Serial.println("aaa");

mySerial.println("aaa");

delay(100);

}

—

CRC

Arduino and RS485 communication

uint16_t CalcCRC(byte * data, uint8_t datlen) {

uint16_t CRC = 0xFFFF; // Init CRC

uint8_t xor_flag;

for (uint8_t n = 0; n < datlen; n++) {

CRC = CRC ^ data[n];

for (uint8_t i = 0; i < 8; i++) {

if (CRC & 0x0001) {

xor_flag = 1;

}

else {

xor_flag = 0;

}

CRC = CRC >> 1;

if (xor_flag) {

CRC = CRC ^ 0xA001;

}

return CRC;

}

void SendCmd( byte * data, uint8_t datlen) { // this is just a test routine to send results Serial Monitor.

uint16_t CRC = CalcCRC(data, datlen);

for (uint8_t i = 0; i < datlen; i++) { // set TX mode, use the correct Serial (softSerial?)

Serial.print(data[i], HEX);

Serial.print(' ');

}

Serial.print(lowByte(CRC), HEX); // This does not match the Example. It could be an error in the manual.

Serial.print(' '); // If the device does not respond, reverse the order byte order the CRC

Serial.println(highByte(CRC), HEX); // is sent. Send highbyte then lowByte.

}

以 {0x01, 0x03, 0x00, 0x00, 0x00, 0x02} 為例，算出來應該是 0xC4, 0x0B 才對

—

硬體接線

正面

背面

—

程式範例

#include <SoftwareSerial.h>

SoftwareSerial rs485;

#define DE 4

byte s[] = {0x60, 0x03, 0x00, 0x00, 0x00, 0x10};

byte r[sizeof(s) + 2];

uint16_t CalcCRC(byte * data, uint8_t datlen) {

uint16_t CRC = 0xFFFF; // Init CRC

uint8_t xor_flag;

for (uint8_t n = 0; n < datlen; n++) {

CRC = CRC ^ data[n];

for (uint8_t i = 0; i < 8; i++) {

if (CRC & 0x0001) {

xor_flag = 1;

}

else {

xor_flag = 0;

}

CRC = CRC >> 1;

if (xor_flag) {

CRC = CRC ^ 0xA001;

}

return CRC;

}

void printHex(uint8_t num) {

char hexCar[2];

sprintf(hexCar, "%02X", num);

Serial.print(hexCar);

}

void setup()

{

pinMode(DE, OUTPUT);

Serial.begin(9600);

rs485.begin(2400, SWSERIAL_8N1, 14, 12);

for ( int i = 0; i < sizeof(s); i++ ) {

r[i] = s[i];

}

void loop()

{

digitalWrite(DE, HIGH);

uint16_t CRC = CalcCRC(s, 6);

r[6] = lowByte(CRC);

r[7] = highByte(CRC);

rs485.write(r, sizeof(r));

digitalWrite(DE, LOW);

delay(300);

for ( int i = 0; i < sizeof(r); i++ ) {

printHex(r[i]);

}

Serial.println();

if (rs485.available() > 0)

{

while (rs485.available() > 0)

{

Serial.print(rs485.read());

Serial.print(',');

yield();

}

Serial.println();

}

delay(1000);

}

運行結果

—

注意事項

如果選擇的 GPIO 會影響燒錄，那重新開機也會影響程式運作，必須先斷開開機完成才會運作，所以還是需要另外選不會影響的腳位。

—

101 total views, 3 views today

PHP – MQTT

Posted on 2020-12-21 by hoyo

—

參考資源

phpMQTT

除了上述資源外，一開始其實使用的是 client 這個，不過軟體太肥，使用麻煩效能也差，才又找了 phpMQTT 使用

—

範例程式

主要是在網頁上執行 publish() 發送，因此只需要可連線，可發送即可

<?php

require('../3rdParty/phpMQTT.php');

$server = 'mq.tongxinmao.com'; // change if necessary

$port = 18830; // change if necessary

$username = ''; // set your username

$password = ''; // set your password

$client_id = 'phpMQTT-publisher'; // make sure this is unique for connecting to sever - you could use uniqid()

$mqtt = new \phpMQTT($server, $port, $client_id);

if ($mqtt->connect(true, NULL)) {

$mqtt->publish('esp8266/test', '{"LED":"'. $_GET['led'] .'"}', 0, false);

$mqtt->close();

} else {

echo "Time out!\n";

}

—

59 total views, 1 views today

ESP8266 – AP Mode 網頁伺服器

Posted on 2020-12-21 by hoyo

—

WebServer

Connection ESP8266 to ESP8266 Client Server can’t Connect, Help me?

使用 ESP8266WebServer.h 而不是自己寫

#include <ESP8266WiFi.h>

#include <WiFiClient.h>

#include <ESP8266WebServer.h>

IPAddress ip(192,168,1,81); // choose IP address

IPAddress subnet(255,255,255,0);

ESP8266WebServer server(80);

void handleRoot() {

String page = "<!DOCTYPE html>\n";

page += "<html>\n<body>\n<h1>Some heading</h1><br>Generated by ESP8266\n</body>\n</html>";

server.send(200, "text/html", page);

}

// what to do when accessed through http://ip_address/something_undefined

void handleNotFound(){

String message = "File not found\n\n";

message += "URI: ";

message += server.uri();

message += "\nMethod: ";

message += (server.method() == HTTP_GET)?"GET":"POST";

message += "\nArguments: ";

message += server.args();

message += "\n";

for (uint8_t i=0; i<server.args(); i++){

message += " " + server.argName(i) + ": " + server.arg(i) + "\n";

}

server.send(404, "text/plain", message);

}

void setup(void){

Serial.begin(74880); // so you can see debug messages automatically sent by ESP8266

WiFi.mode(WIFI_AP);

WiFi.softAPConfig(ip, ip, subnet); // declared as: bool softAPConfig (IPAddress local_ip, IPAddress gateway, IPAddress subnet)

WiFi.softAP("SOME_NAME", "password", 7); // network name, network password, wifi channel

IPAddress myIP = WiFi.softAPIP();

Serial.println();

Serial.print("AP IP address: ");

Serial.println(myIP);

server.on("/", handleRoot); // what to do when accessed through browser using http://IP_address

// what to do when accessed through http://ip_address/test

server.on("/test", [](){

server.send(200, "text/plain", "This is another page");

});

server.on("/sa/1", [](){

// ... <-- put here the code for NeoPixel = on

server.send(200, "text/html", "NeoPixel is now on");

});

server.on("/sa/0", [](){

// ... <-- put here the code for NeoPixel = off

server.send(200, "text/html", "NeoPixel is now off");

});

server.onNotFound(handleNotFound);

server.begin();

Serial.println("HTTP server started...");

}

void loop(void){

server.handleClient();

}

—

URL 的 $_GET()

ESP8266 Webserver: Getting query parameters

一般來說使用 handleSpecificArg() 是比較常用的

void handleGenericArgs() {

String message = "";

message += server.arg(0) + "\n";

String rs_message = getValue(message, ',');

message += rs_message;

server.send(200, "text / plain", message); //Response to the HTTP request

}

void handleSpecificArg() {

String message = "";

if (server.arg("Temperature") == "") { //Parameter not found

message = "Temperature Argument not found";

} else { //Parameter found

message = "Temperature Argument = ";

message += server.arg("Temperature"); //Gets the value of the query parameter

}

server.send(200, "text / plain", message); //Returns the HTTP response

}

server.on("/rs", handleGenericArgs);

—

應用

有了 WiFi AP 也有了取得網址變數的方法，接下來就可以設計應用場景網址的變數使用。例如 http://192.168.2.1/url?led=on&light=1 ，可以表示開啟 led 以及亮 1 秒

—

64 total views, 2 views today

MQTT – 4. MQTT Broker

Posted on 2020-11-23 by hoyo

—

MQTT broker

Broker 幾乎都是 Erlang 的天下

後續考量 MySQL 身份認證、SSL、平台支援、ACL 訂閱限制，最後選擇 EMQ X

—

EMQ X

不得不說，大陸的軟體就是好用，設想的較為周全，文件也齊全，平台支援性也完整

CentOS 7

# wget https://www.emqx.io/downloads/broker/v4.2.3/emqx-centos7-4.2.3-x86_64.rpm

# rpm -ivh emqx-centos7-4.2.3-x86_64.rpm

# emqx start

Ubuntu 20

# wget https://www.emqx.io/cn/downloads/broker/v4.2.2/emqx-ubuntu20.04-4.2.2-x86_64.deb

# dpkg -i emqx-ubuntu20.04-4.2.2-x86_64.deb

# emqx start

—

VerneMQ

CentOS 7

Installing on CentOS and RHEL

下載安裝後不要傻傻的按照官方的說法直接啟動服務，那是不會成功的，還要先設定設定檔才行

-- Unit vernemq.service has begun starting up.

Nov 15 14:39:18 hoyoserver vernemq[3427]: Before you can continue, the product license

Nov 15 14:39:18 hoyoserver vernemq[3427]: must be accepted. The license can be viewed at

Nov 15 14:39:18 hoyoserver vernemq[3427]: https://vernemq.com/end-user-license-agreement

Nov 15 14:39:18 hoyoserver vernemq[3427]: If you do not accept this license you will

Nov 15 14:39:18 hoyoserver vernemq[3427]: not be able to use VerneMQ.

Nov 15 14:39:18 hoyoserver vernemq[3427]: Accepting the product license will modify the

Nov 15 14:39:18 hoyoserver vernemq[3427]: VerneMQ config file

Nov 15 14:39:18 hoyoserver vernemq[3427]: /etc/vernemq/vernemq.conf

Nov 15 14:39:18 hoyoserver systemd[1]: vernemq.service: control process exited, code=exited status=2

Nov 15 14:39:18 hoyoserver vernemq[3427]: setting the "accept_eula" config to "yes".

Nov 15 14:39:18 hoyoserver vernemq[3427]: Product license not accepted. Stopping.

Nov 15 14:39:18 hoyoserver systemd[1]: Failed to start VerneMQ Server.

1	# vi /etc/vernemq/vernemq.conf

1 2	accept_eula = yes listener.tcp.default = 0.0.0.0:1883

Ubuntu 20 – Docker

使用 dpkg 安裝 deb ，出現 libss 版本不符錯誤，目前找不到解決方法，改採 Docker 方式使用

1	# docker run -p 1883:1883 -p 8888:8888 -e "DOCKER_VERNEMQ_ACCEPT_EULA=yes" -e "DOCKER_VERNEMQ_ALLOW_ANONYMOUS=on" --name vernemq1 -d vernemq/vernemq

使用 netstat 查詢轉址無法判斷，直接測試使用即可

開機啟動

1	# docker update --restart=always <CONTAINER ID>

Dockerfile

Dockerfile

FROM debian:stretch-slim

RUN apt-get update && \

apt-get -y install bash procps openssl iproute2 curl jq libsnappy-dev net-tools && \

rm -rf /var/lib/apt/lists/* && \

addgroup --gid 10000 vernemq && \

adduser --uid 10000 --system --ingroup vernemq --home /vernemq --disabled-password vernemq

WORKDIR /vernemq

# Defaults

ENV DOCKER_VERNEMQ_KUBERNETES_LABEL_SELECTOR="app=vernemq" \

DOCKER_VERNEMQ_LOG__CONSOLE=console \

PATH="/vernemq/bin:$PATH" \

VERNEMQ_VERSION="1.11.0"

COPY --chown=10000:10000 bin/vernemq.sh /usr/sbin/start_vernemq

COPY --chown=10000:10000 files/vm.args /vernemq/etc/vm.args

ADD https://github.com/vernemq/vernemq/releases/download/$VERNEMQ_VERSION/vernemq-$VERNEMQ_VERSION.stretch.tar.gz /tmp

RUN tar -xzvf /tmp/vernemq-$VERNEMQ_VERSION.stretch.tar.gz && \

rm /tmp/vernemq-$VERNEMQ_VERSION.stretch.tar.gz && \

chown -R 10000:10000 /vernemq && \

ln -s /vernemq/etc /etc/vernemq && \

ln -s /vernemq/data /var/lib/vernemq && \

ln -s /vernemq/log /var/log/vernemq

# Ports

# 1883 MQTT

# 8883 MQTT/SSL

# 8080 MQTT WebSockets

# 44053 VerneMQ Message Distribution

# 4369 EPMD - Erlang Port Mapper Daemon

# 8888 Prometheus Metrics

# 9100 9101 9102 9103 9104 9105 9106 9107 9108 9109 Specific Distributed Erlang Port Range

EXPOSE 1883 8883 8080 44053 4369 8888 \

9100 9101 9102 9103 9104 9105 9106 9107 9108 9109

VOLUME ["/vernemq/log", "/vernemq/data", "/vernemq/etc"]

HEALTHCHECK CMD vernemq ping | grep -q pong

USER vernemq

CMD ["start_vernemq"]

啟動自動執行 /usr/sbin/start_vernemq

start_vernemq

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#!/usr/bin/env bash

NET_INTERFACE=$(route | grep '^default' | grep -o '[^ ]*$')

NET_INTERFACE=${DOCKER_NET_INTERFACE:-${NET_INTERFACE}}

IP_ADDRESS=$(ip -4 addr show ${NET_INTERFACE} | grep -oE '[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}' | sed -e "s/^[[:space:]]*//" | head -n 1)

IP_ADDRESS=${DOCKER_IP_ADDRESS:-${IP_ADDRESS}}

# Ensure the Erlang node name is set correctly

if env | grep "DOCKER_VERNEMQ_NODENAME" -q; then

sed -i.bak -r "s/-name VerneMQ@.+/-name VerneMQ@${DOCKER_VERNEMQ_NODENAME}/" /vernemq/etc/vm.args

else

if [ -n "$DOCKER_VERNEMQ_SWARM" ]; then

NODENAME=$(hostname -i)

sed -i.bak -r "s/VerneMQ@.+/VerneMQ@${NODENAME}/" /etc/vernemq/vm.args

else

sed -i.bak -r "s/-name VerneMQ@.+/-name VerneMQ@${IP_ADDRESS}/" /vernemq/etc/vm.args

if env | grep "DOCKER_VERNEMQ_DISCOVERY_NODE" -q; then

discovery_node=$DOCKER_VERNEMQ_DISCOVERY_NODE

if [ -n "$DOCKER_VERNEMQ_SWARM" ]; then

tmp=''

while [[ -z "$tmp" ]]; do

tmp=$(getent hosts tasks.$discovery_node | awk '{print $1}' | head -n 1)

sleep 1

done

discovery_node=$tmp

if [ -n "$DOCKER_VERNEMQ_COMPOSE" ]; then

tmp=''

while [[ -z "$tmp" ]]; do

tmp=$(getent hosts $discovery_node | awk '{print $1}' | head -n 1)

sleep 1

done

discovery_node=$tmp

sed -i.bak -r "/-eval.+/d" /vernemq/etc/vm.args

echo "-eval \"vmq_server_cmd:node_join('VerneMQ@$discovery_node')\"" >> /vernemq/etc/vm.args

# If you encounter "SSL certification error (subject name does not match the host name)", you may try to set DOCKER_VERNEMQ_KUBERNETES_INSECURE to "1".

insecure=""

if env | grep "DOCKER_VERNEMQ_KUBERNETES_INSECURE" -q; then

insecure="--insecure"

if env | grep "DOCKER_VERNEMQ_DISCOVERY_KUBERNETES" -q; then

DOCKER_VERNEMQ_KUBERNETES_CLUSTER_NAME=${DOCKER_VERNEMQ_KUBERNETES_CLUSTER_NAME:-cluster.local}

# Let's get the namespace if it isn't set

DOCKER_VERNEMQ_KUBERNETES_NAMESPACE=${DOCKER_VERNEMQ_KUBERNETES_NAMESPACE:-`cat /var/run/secrets/kubernetes.io/serviceaccount/namespace`}

# Let's set our nodename correctly

VERNEMQ_KUBERNETES_SUBDOMAIN=${DOCKER_VERNEMQ_KUBERNETES_SUBDOMAIN:-$(curl -X GET $insecure --cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt https://kubernetes.default.svc.$DOCKER_VERNEMQ_KUBERNETES_CLUSTER_NAME/api/v1/namespaces/$DOCKER_VERNEMQ_KUBERNETES_NAMESPACE/pods?labelSelector=$DOCKER_VERNEMQ_KUBERNETES_LABEL_SELECTOR -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" | jq '.items[0].spec.subdomain' | sed 's/"//g' | tr '\n' '\0')}

if [ $VERNEMQ_KUBERNETES_SUBDOMAIN == "null" ]; then

VERNEMQ_KUBERNETES_HOSTNAME=${MY_POD_NAME}.${DOCKER_VERNEMQ_KUBERNETES_NAMESPACE}.svc.${DOCKER_VERNEMQ_KUBERNETES_CLUSTER_NAME}

else

VERNEMQ_KUBERNETES_HOSTNAME=${MY_POD_NAME}.${VERNEMQ_KUBERNETES_SUBDOMAIN}.${DOCKER_VERNEMQ_KUBERNETES_NAMESPACE}.svc.${DOCKER_VERNEMQ_KUBERNETES_CLUSTER_NAME}

sed -i.bak -r "s/VerneMQ@.+/VerneMQ@${VERNEMQ_KUBERNETES_HOSTNAME}/" /vernemq/etc/vm.args

# Hack into K8S DNS resolution (temporarily)

kube_pod_names=$(curl -X GET $insecure --cacert /var/run/secrets/kubernetes.io/serviceaccount/ca.crt https://kubernetes.default.svc.$DOCKER_VERNEMQ_KUBERNETES_CLUSTER_NAME/api/v1/namespaces/$DOCKER_VERNEMQ_KUBERNETES_NAMESPACE/pods?labelSelector=$DOCKER_VERNEMQ_KUBERNETES_LABEL_SELECTOR -H "Authorization: Bearer $(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" | jq '.items[].spec.hostname' | sed 's/"//g' | tr '\n' ' ')

for kube_pod_name in $kube_pod_names;

if [ $kube_pod_name == "null" ]

then

echo "Kubernetes discovery selected, but no pods found. Maybe we're the first?"

echo "Anyway, we won't attempt to join any cluster."

break

if [ $kube_pod_name != $MY_POD_NAME ]

then

echo "Will join an existing Kubernetes cluster with discovery node at ${kube_pod_name}.${VERNEMQ_KUBERNETES_SUBDOMAIN}.${DOCKER_VERNEMQ_KUBERNETES_NAMESPACE}.svc.${DOCKER_VERNEMQ_KUBERNETES_CLUSTER_NAME}"

echo "-eval \"vmq_server_cmd:node_join('VerneMQ@${kube_pod_name}.${VERNEMQ_KUBERNETES_SUBDOMAIN}.${DOCKER_VERNEMQ_KUBERNETES_NAMESPACE}.svc.${DOCKER_VERNEMQ_KUBERNETES_CLUSTER_NAME}')\"" >> /vernemq/etc/vm.args

break

done

if [ -f /vernemq/etc/vernemq.conf.local ]; then

cp /vernemq/etc/vernemq.conf.local /vernemq/etc/vernemq.conf

sed -i -r "s/###IPADDRESS###/${IP_ADDRESS}/" /vernemq/etc/vernemq.conf

else

sed -i '/########## Start ##########/,/########## End ##########/d' /vernemq/etc/vernemq.conf

echo "########## Start ##########" >> /vernemq/etc/vernemq.conf

env | grep DOCKER_VERNEMQ | grep -v 'DISCOVERY_NODE\|KUBERNETES\|SWARM\|COMPOSE\|DOCKER_VERNEMQ_USER' | cut -c 16- | awk '{match($0,/^[A-Z0-9_]*/)}{print tolower(substr($0,RSTART,RLENGTH)) substr($0,RLENGTH+1)}' | sed 's/__/./g' >> /vernemq/etc/vernemq.conf

users_are_set=$(env | grep DOCKER_VERNEMQ_USER)

if [ ! -z "$users_are_set" ]; then

echo "vmq_passwd.password_file = /vernemq/etc/vmq.passwd" >> /vernemq/etc/vernemq.conf

touch /vernemq/etc/vmq.passwd

for vernemq_user in $(env | grep DOCKER_VERNEMQ_USER); do

username=$(echo $vernemq_user | awk -F '=' '{ print $1 }' | sed 's/DOCKER_VERNEMQ_USER_//g' | tr '[:upper:]' '[:lower:]')

password=$(echo $vernemq_user | awk -F '=' '{ print $2 }')

/vernemq/bin/vmq-passwd /vernemq/etc/vmq.passwd $username <<EOF

$password

EOF

done

if [ -z "$DOCKER_VERNEMQ_ERLANG__DISTRIBUTION__PORT_RANGE__MINIMUM" ]; then

echo "erlang.distribution.port_range.minimum = 9100" >> /vernemq/etc/vernemq.conf

if [ -z "$DOCKER_VERNEMQ_ERLANG__DISTRIBUTION__PORT_RANGE__MAXIMUM" ]; then

echo "erlang.distribution.port_range.maximum = 9109" >> /vernemq/etc/vernemq.conf

if [ -z "$DOCKER_VERNEMQ_LISTENER__TCP__DEFAULT" ]; then

echo "listener.tcp.default = ${IP_ADDRESS}:1883" >> /vernemq/etc/vernemq.conf

if [ -z "$DOCKER_VERNEMQ_LISTENER__WS__DEFAULT" ]; then

echo "listener.ws.default = ${IP_ADDRESS}:8080" >> /vernemq/etc/vernemq.conf

if [ -z "$DOCKER_VERNEMQ_LISTENER__VMQ__CLUSTERING" ]; then

echo "listener.vmq.clustering = ${IP_ADDRESS}:44053" >> /vernemq/etc/vernemq.conf

if [ -z "$DOCKER_VERNEMQ_LISTENER__HTTP__METRICS" ]; then

echo "listener.http.metrics = ${IP_ADDRESS}:8888" >> /vernemq/etc/vernemq.conf

echo "########## End ##########" >> /vernemq/etc/vernemq.conf

# Check configuration file

/vernemq/bin/vernemq config generate 2>&1 > /dev/null | tee /tmp/config.out | grep error

if [ $? -ne 1 ]; then

echo "configuration error, exit"

echo "$(cat /tmp/config.out)"

exit $?

pid=0

# SIGUSR1-handler

siguser1_handler() {

echo "stopped"

}

# SIGTERM-handler

sigterm_handler() {

if [ $pid -ne 0 ]; then

# this will stop the VerneMQ process, but first drain the node from all existing client sessions (-k)

if [ -n "$VERNEMQ_KUBERNETES_HOSTNAME" ]; then

terminating_node_name=VerneMQ@$VERNEMQ_KUBERNETES_HOSTNAME

elif [ -n "$DOCKER_VERNEMQ_SWARM" ]; then

terminating_node_name=VerneMQ@$(hostname -i)

else

terminating_node_name=VerneMQ@$IP_ADDRESS

/vernemq/bin/vmq-admin cluster leave node=$terminating_node_name -k > /dev/null

/vernemq/bin/vmq-admin node stop > /dev/null

kill -s TERM ${pid}

exit 0

}

# Setup OS signal handlers

trap 'siguser1_handler' SIGUSR1

trap 'sigterm_handler' SIGTERM

# Start VerneMQ

/vernemq/bin/vernemq console -noshell -noinput $@ &

pid=$!

wait $pid

—

Eclipse Mosquitto

[ Broker ] 在 Ubuntu 安裝 Mosquitto MQTT Broker

Ubuntu 20

1	# apt-get install mosquitto mosquitto-clients

需要重新安裝設定檔可以使用

1	# apt-get -o DPkg::options::=--force-confmiss --reinstall install mosquitto

—

RabbitMQ

MQTT 在 RabbitMQ 只是其中一個 Plugin，不會用

Ubuntu 20

1	# apt-get install erlang-base erlang-asn1 erlang-crypto erlang-eldap erlang-ftp erlang-inets erlang-mnesia erlang-os-mon erlang-parsetools erlang-public-key erlang-runtime-tools erlang-snmp erlang-ssl erlang-syntax-tools erlang-tftp erlang-tools erlang-xmerl

1	# apt-get install rabbitmq-server

1	# rabbitmq-plugins enable rabbitmq_mqtt

—

Mosquitto MySQL plugin 安裝

1	# apt-get install libssl-dev mosquitto-dev libmysqlclient-dev

最後編譯失敗，不會用

—

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PHP 網頁應用 IOT 物聯網自動化

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ESP8266 – RS485 Modbus 通訊

MAX485

SoftwareSerial

CRC

硬體接線

程式範例

注意事項

PHP – MQTT

參考資源

範例程式

ESP8266 – AP Mode 網頁伺服器

WebServer

URL 的 $_GET()

應用

MQTT – 4. MQTT Broker

MQTT broker

EMQ X

VerneMQ

Eclipse Mosquitto

RabbitMQ

Mosquitto MySQL plugin 安裝