add a chiller_cycle tool

Add a chiller_cycle tool, which is based on the chiller tool. This tool will continuous monitor the status of the chiller (target temp, measured temp, ramp rate) to be parsed in other programs. In addition, this tool can do thermal cycle with the chiller with input of low and high temp, up and down ramp rate, and number of cycles, etc.

This tool will be needed for the chiller control GUI for strips powerboard and module tests.

Example config file to make this tool to work:

{
    "version": "1.0",
    "options" : {
    },
    "devices": [
        {
            "name": "CH1",
            "hw-type": "Chiller",
            "hw-model": "SPSRC211",
            "communication": {
                "protocol" : "TextSerialCom",
                "port" : "/dev/ttyUSB1",
                "baudrate" : "B9600",
                "parityBit":  false,
                "twoStopBits":  false,
                "flowControl":  false,
                "charsize":  "CS8",
                "termination" : "\r"
            }
        }
    ],
    "datasinks": [
        {
            "name": "Console",
            "sinktype": "ConsoleSink"
        },
        {
            "name": "db",
            "sinktype": "InfluxDBSink",
            "host": "128.3.50.38",
            "port": 8086,
            "database": "pbv3",
            "username": "strips_powerboard_rw",
            "password": "your_password_here"
        }
    ],
    "datastreams": [
        {
            "name": "Climate",
            "sinks": [
                "Console",
                "db"
            ]
        }
    ],
    "streamChannels": [
        {
            "name": "Climate",
            "DB_MeasurementName": "rack0_crate1_env",
            "DB_ChannelName": "ChillerTemp"
        }
    ]
}

And to run the tool, one can do something like this:

../build/bin/chiller_cycle -e chiller_config.json -n CH1 -s Climate meas-temp

src/libChiller/SPSRC211.cpp

@@ -11,8 +11,10 @@ REGISTER_CHILLER(SPSRC211)
 SPSRC211::SPSRC211(const std::string& name) : IChiller(name, {"SPSRC211"}) {}
 
 void SPSRC211::init() {
+    logger(logINFO) << "Initialize chiller ... ";
     command("POLL");       // verify establishment of communication
     command("DEGREES=0");  // set temperature unit to be Celsius
+    command("CLRALARM");  // clear alarm
 
     int faultcode = getFaultStatus();
     if (faultcode != 0) {
@@ -59,13 +61,14 @@ std::string SPSRC211::command(const std::string& cmd) {
 float SPSRC211::parseString(const std::string& output) {
     // example output: F044=+0021.78!
     // need to return +21.78
-    if (output.length() != 14 || output[4] != '=' || output[13] != '!') {
+    size_t idx_equal = output.find("=");
+    if (idx_equal == std::string::npos) {
         logger(logERROR) << __PRETTY_FUNCTION__
                          << " -> Received an invalid output from chiller: "
                          << output;
         throw std::runtime_error("Received an invalid output from chiller");
     }
-    return std::stof(output.substr(5, 8));
+    return std::stof(output.substr(idx_equal+1, 8));
 }
 
 void SPSRC211::turnOn() {
@@ -82,6 +85,8 @@ void SPSRC211::turnOff() {
     command("STOP");
     logger(logDEBUG) << "Chiller has been turned "
                      << (getStatus() ? "ON" : "OFF");
+    logger(logWARNING)
+        << "For safety reasons, please wait 1 min before turning back ON";
 }
 
 void SPSRC211::setRampRate(float RR) {