loop.pl

   1 #!/usr/bin/perl
   2 use strict;
   3
   4 use v5.10.1;
   5
   6 use Mojolicious::Lite;
   7 use Serial;
   8 use Mojo::IOLoop;
   9 use Mojo::IOLoop::Stream;
  10 use Mojo::Transaction::WebSocket;
  11 #use Mojo::JSON  qw(decode_json encode_json);
  12 use JSON;
  13 use Debug;
  14 use SMGLog;
  15 use Math::Round qw(nearest);
  16 use File::Copy;
  17 use Data::Random qw(rand_chars);
  18 use IO::File;
  19
  20 use constant pi => 3.14159265358979;
  21
  22 my $devname = "/dev/davis";
  23 my $datafn = ".loop_data";
  24 my $dataf;
  25
  26 my $poll_interval = 2.5;
  27 my $rain_mult = 0.2;                            # 0.1 or 0.2 mm or 0.01 inches
  28 my $tid;
  29 my $rid;
  30 our $did;
  31 my $nlcount;
  32 my $state = "ready";
  33 my $buf;
  34 my $dbg;
  35 my $ser;                                                        # the serial port Mojo::IOLoop::Stream
  36 my $last_min_h;
  37 my $last_hour_h;
  38
  39 our $json = JSON->new->canonical(1);
  40 our $WS = {};                                   # websocket connections
  41
  42 our $ld = {};
  43 our @last10minsr = ();
  44 our @last5daysh = ();
  45
  46 our $loop_count;                                # how many LOOPs we have done, used as start indicator
  47
  48 our     @crc_table = (
  49                                   0x0, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
  50                                   0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
  51                                   0x1231, 0x210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
  52                                   0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
  53                                   0x2462, 0x3443, 0x420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
  54                                   0xa56a, 0xb54b, 0x8528, 0x9509, 0xe5ee, 0xf5cf, 0xc5ac, 0xd58d,
  55                                   0x3653, 0x2672, 0x1611, 0x630, 0x76d7, 0x66f6, 0x5695, 0x46b4,
  56                                   0xb75b, 0xa77a, 0x9719, 0x8738, 0xf7df, 0xe7fe, 0xd79d, 0xc7bc,
  57                                   0x48c4, 0x58e5, 0x6886, 0x78a7, 0x840, 0x1861, 0x2802, 0x3823,
  58                                   0xc9cc, 0xd9ed, 0xe98e, 0xf9af, 0x8948, 0x9969, 0xa90a, 0xb92b,
  59                                   0x5af5, 0x4ad4, 0x7ab7, 0x6a96, 0x1a71, 0xa50, 0x3a33, 0x2a12,
  60                                   0xdbfd, 0xcbdc, 0xfbbf, 0xeb9e, 0x9b79, 0x8b58, 0xbb3b, 0xab1a,
  61                                   0x6ca6, 0x7c87, 0x4ce4, 0x5cc5, 0x2c22, 0x3c03, 0xc60, 0x1c41,
  62                                   0xedae, 0xfd8f, 0xcdec, 0xddcd, 0xad2a, 0xbd0b, 0x8d68, 0x9d49,
  63                                   0x7e97, 0x6eb6, 0x5ed5, 0x4ef4, 0x3e13, 0x2e32, 0x1e51, 0xe70,
  64                                   0xff9f, 0xefbe, 0xdfdd, 0xcffc, 0xbf1b, 0xaf3a, 0x9f59, 0x8f78,
  65                                   0x9188, 0x81a9, 0xb1ca, 0xa1eb, 0xd10c, 0xc12d, 0xf14e, 0xe16f,
  66                                   0x1080, 0xa1, 0x30c2, 0x20e3, 0x5004, 0x4025, 0x7046, 0x6067,
  67                                   0x83b9, 0x9398, 0xa3fb, 0xb3da, 0xc33d, 0xd31c, 0xe37f, 0xf35e,
  68                                   0x2b1, 0x1290, 0x22f3, 0x32d2, 0x4235, 0x5214, 0x6277, 0x7256,
  69                                   0xb5ea, 0xa5cb, 0x95a8, 0x8589, 0xf56e, 0xe54f, 0xd52c, 0xc50d,
  70                                   0x34e2, 0x24c3, 0x14a0, 0x481, 0x7466, 0x6447, 0x5424, 0x4405,
  71                                   0xa7db, 0xb7fa, 0x8799, 0x97b8, 0xe75f, 0xf77e, 0xc71d, 0xd73c,
  72                                   0x26d3, 0x36f2, 0x691, 0x16b0, 0x6657, 0x7676, 0x4615, 0x5634,
  73                                   0xd94c, 0xc96d, 0xf90e, 0xe92f, 0x99c8, 0x89e9, 0xb98a, 0xa9ab,
  74                                   0x5844, 0x4865, 0x7806, 0x6827, 0x18c0, 0x8e1, 0x3882, 0x28a3,
  75                                   0xcb7d, 0xdb5c, 0xeb3f, 0xfb1e, 0x8bf9, 0x9bd8, 0xabbb, 0xbb9a,
  76                                   0x4a75, 0x5a54, 0x6a37, 0x7a16, 0xaf1, 0x1ad0, 0x2ab3, 0x3a92,
  77                                   0xfd2e, 0xed0f, 0xdd6c, 0xcd4d, 0xbdaa, 0xad8b, 0x9de8, 0x8dc9,
  78                                   0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0xcc1,
  79                                   0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
  80                                   0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0xed1, 0x1ef0
  81                                  );
  82
  83 our %bar_trend;
  84
  85 $bar_trend{-60} = "Falling Rapidly";
  86 $bar_trend{196} = "Falling Rapidly";
  87 $bar_trend{-20} = "Falling Slowly";
  88 $bar_trend{236} = "Falling Slowly";
  89 $bar_trend{0} = "Steady";
  90 $bar_trend{20} = "Rising Slowly";
  91 $bar_trend{60} = "Rising Rapidly";
  92
  93 our $ending = 0;
  94
  95 $SIG{TERM} = $SIG{INT} = sub {++$ending; Mojo::IOLoop->stop;};
  96 $SIG{HUP} = 'IGNORE';
  97
  98
  99 # WebSocket weather service
 100 websocket '/weather' => sub {
 101   my $c = shift;
 102   my $msg = shift;
 103   my $tx = $c->tx;
 104
 105   # Opened
 106   app->log->debug('WebSocket opened.');
 107   dbg 'WebSocket opened' if isdbg 'chan';
 108   $WS->{$tx} = $tx;
 109
 110   # send historical data
 111   $c->send($ld->{lasthour_h}) if exists $ld->{lasthour_h};
 112   $c->send($ld->{lastmin_h}) if exists $ld->{lastmin_h};
 113
 114   # send the 5 days worth of data to the graph
 115   say "last10min = " . scalar @last10minsr . " last5day = " . scalar  @last5daysh;
 116   $c->send($_) for @last10minsr;
 117   $c->send($_) for @last5daysh;
 118
 119   # disable timeout
 120   $c->inactivity_timeout(3615);
 121
 122   # Incoming message
 123   $c->on(
 124                  message => sub {
 125                          my ($c, $msg) = @_;
 126                          dbg "websocket: text $msg" if isdbg 'chan';
 127                  },
 128                  json => sub {
 129                          my ($c, $msg) = @_;
 130                          dbg "websocket: json $msg" if isdbg 'chan';
 131                  }
 132   );
 133
 134   # Closed
 135   $c->on(finish => sub {
 136     my ($c, $code, $reason) = @_;
 137     app->log->debug("WebSocket closed with status $code.");
 138         dbg "websocket closed with status $code" if isdbg 'chan';
 139         delete $WS->{$tx};
 140   });
 141 };
 142
 143 get '/' => {template => 'index'};
 144
 145
 146 dbginit();
 147 if (@ARGV) {
 148         dbgadd(@ARGV);
 149 }
 150 dbgadd('chan');
 151
 152 dbg '***';
 153 dbg "*** starting $0";
 154 dbg '***';
 155
 156 read_ld();
 157
 158 my $tnow = time;
 159 my $dayno = int ($tnow/86400);
 160 @last5daysh = grab_history(SMGLog->new("day"), "h", $tnow-(86400*5), $_) for ($dayno-4, $dayno-3, $dayno-2, $dayno-1, $dayno);
 161 @last10minsr = map {my ($t, $js) = split(/\s/, $_, 2); $js} grab_history(SMGLog->new("debug"), "r", $tnow-(60*3), $dayno);
 162
 163 our $dlog = SMGLog->new("day");
 164 dbg "before next tick";
 165 Mojo::IOLoop->next_tick(sub { loop() });
 166 dbg "before app start";
 167 app->start;
 168 dbg "after app start";
 169
 170 write_ld();
 171 $dataf->close if $dataf;
 172 undef $dataf;
 173
 174
 175 # move all the files along one
 176 cycle_loop_data_files();
 177
 178 dbg '***';
 179 dbg "*** ending $0";
 180 dbg '***';
 181
 182 exit 0;
 183
 184 ##################################################################################
 185
 186 sub loop
 187 {
 188         dbg "last_min: " . scalar gmtime($ld->{last_min});
 189         dbg "last_hour: " . scalar gmtime($ld->{last_hour});
 190
 191         $did = Mojo::IOLoop->recurring(1 => sub {$dlog->flushall});
 192
 193         do_reopen($devname);
 194 }
 195
 196
 197
 198 sub on_read
 199 {
 200         my ($ser, $d) = @_;
 201         $buf .= $d;
 202         $d =~ s/([\%\x00-\x1f\x7f-\xff])/sprintf("%%%02X", ord($1))/eg;
 203         dbg "read added '$d' buf lth=" . length $buf if isdbg 'raw';
 204         if ($state eq 'waitnl' && $buf =~ /[\cJ\cM]+/) {
 205                 dbg "Got \\n" if isdbg 'state';
 206                 Mojo::IOLoop->remove($tid) if $tid;
 207                 undef $tid;
 208                 undef $buf;
 209                 $nlcount = 0;
 210                 $ser->write("LPS 1 1\n");
 211                 chgstate("waitloop");
 212         } elsif ($state eq "waitloop") {
 213                 if ($buf =~ /\x06/) {
 214                         dbg "Got ACK 0x06" if isdbg 'state';
 215                         chgstate('waitlooprec');
 216                         undef $buf;
 217                 }
 218         } elsif ($state eq 'waitlooprec') {
 219                 if (length $buf >= 99) {
 220                         dbg "got loop record" if isdbg 'chan';
 221                         chgstate('');
 222                         process($buf);
 223                         undef $buf;
 224                 }
 225         }
 226 }
 227
 228 sub start_loop
 229 {
 230         $nlcount = 1;
 231         dbg "start_loop writing $nlcount \\n" if isdbg 'state';
 232         $ser->write("\n");
 233         Mojo::IOLoop->remove($tid) if $tid;
 234         undef $tid;
 235         $tid = Mojo::IOLoop->recurring(0.6 => sub {
 236                                                                            if (++$nlcount > 10) {
 237                                                                                    dbg "\\n count > 10, closing connection" if isdbg 'chan';
 238                                                                                    do_reopen($devname);
 239                                                                                    return;
 240                                                                            }
 241                                                                            dbg "writing $nlcount \\n" if isdbg 'state';
 242                                                                            $ser->write("\n");
 243                                                                    });
 244         chgstate("waitnl");
 245 }
 246
 247 sub chgstate
 248 {
 249         dbg "state '$state' -> '$_[0]'" if isdbg 'state';
 250         $state = $_[0];
 251 }
 252
 253 sub do_reopen
 254 {
 255         my $name = shift;
 256         dbg "do reopen on '$name' ending $ending";
 257         unless ($ending) {
 258                 $ser = do_open($name);
 259                 start_loop();
 260                 chgstate('');
 261                 $nlcount = 0;
 262                 Mojo::IOLoop->start unless Mojo::IOLoop->is_running;
 263         }
 264 }
 265
 266 sub do_open
 267 {
 268         my $name = shift;
 269
 270         $ser->close if $ser;
 271         undef $ser;
 272
 273         my $ob = Serial->new($name, 19200) || die "$name $!\n";
 274         dbg "streaming $name fileno(" . fileno($ob) . ")" if isdbg 'chan';
 275
 276         my $ser = Mojo::IOLoop::Stream->new($ob);
 277         $ser->on(error=>sub {dbg "serial $_[1]"; do_reopen($name) unless $ending});
 278         $ser->on(close=>sub {dbg "serial closing"; do_reopen($name) unless $ending});
 279         $ser->on(timeout=>sub {dbg "serial timeout";});
 280         $ser->on(read=>sub {on_read(@_)});
 281         $ser->start;
 282
 283         Mojo::IOLoop->remove($tid) if $tid;
 284         undef $tid;
 285         Mojo::IOLoop->remove($rid) if $rid;
 286         undef $rid;
 287         $rid = Mojo::IOLoop->recurring($poll_interval => sub {
 288                                                                            start_loop() if !$state;
 289                                                                    });
 290         chgstate('');
 291         $nlcount = 0;
 292
 293         return $ser;
 294 }
 295
 296 my @min;
 297 my @hour;
 298
 299 sub process
 300 {
 301         my $blk = shift;
 302         my $loo =  substr $blk,0,3;
 303         unless ( $loo eq 'LOO') {
 304                 dbg "Block invalid loo -> $loo" if isdbg 'chan'; return;
 305         }
 306
 307         my $tmp;
 308         my $temp;
 309         my $rain;
 310         my %h;
 311
 312         my $crc_calc = CRC_CCITT($blk);
 313
 314         if ($crc_calc==0) {
 315
 316                 # Common ones
 317                 $tmp = unpack("s", substr $blk,7,2) / 1000;
 318                 $h{Pressure} = nearest(1, in2mb($tmp));
 319
 320                 $tmp = unpack("s", substr $blk,9,2) / 10;
 321                 $h{Temp_In} = nearest(0.1, f2c($tmp));
 322
 323                 $temp  = nearest(0.1, f2c(unpack("s", substr $blk,12,2) / 10));
 324                 $h{Temp_Out}  = $temp;
 325                 if ($temp > 75 || $temp < -75) {
 326                         dbg "LOOP Temperature out of range ($temp), record ignored";
 327                         return;
 328                 }
 329
 330                 $tmp = unpack("C", substr $blk,14,1);
 331                 $h{Wind} = nearest(0.1, mph2mps($tmp));
 332                 $h{Dir}     = unpack("s", substr $blk,16,2)+0;
 333
 334                 my $wind = {w => $h{Wind}, d => $h{Dir}};
 335                 $wind = 0 if $wind == 255;
 336                 push @{$ld->{wind_min}}, $wind;
 337
 338                 $tmp = int(unpack("C", substr $blk,33,1)+0);
 339                 if ($tmp > 100) {
 340                         dbg "LOOP Outside Humidity out of range ($tmp), record ignored";
 341                         return;
 342                 }
 343                 $h{Humidity_Out} = $tmp;
 344                 $tmp = int(unpack("C", substr $blk,11,1)+0);
 345                 if ($tmp > 100) {
 346                         dbg "LOOP Inside Humidity out of range ($tmp), record ignored";
 347                         return;
 348                 }
 349                 $h{Humidity_In}  = $tmp;
 350
 351
 352                 $tmp = unpack("C", substr $blk,43,1)+0;
 353                 $h{UV} = $tmp unless $tmp >= 255;
 354                 $tmp = unpack("s", substr $blk,44,2)+0; # watt/m**2
 355                 $h{Solar} = $tmp unless $tmp >= 32767;
 356
 357                 #       $h{Rain_Rate}  = nearest(0.1,unpack("s", substr $blk,41,2) * $rain_mult);
 358                 $rain = $h{Rain_Day}   = nearest(0.1, unpack("s", substr $blk,50,2) * $rain_mult);
 359                 my $delta_rain = $h{Rain} = nearest(0.1, ($rain >= $ld->{last_rain} ? $rain - $ld->{last_rain} : $rain)) if $loop_count;
 360                 $ld->{last_rain} = $rain;
 361
 362                 # what sort of packet is it?
 363                 my $sort =  unpack("C", substr $blk,4,1);
 364                 if ($sort) {
 365
 366                         # Newer LOOP2 packet
 367                         $tmp = unpack("C", substr $blk,18,2);
 368                         #               $h{Wind_Avg_10} = nearest(0.1,mph2mps($tmp/10));
 369                         $tmp = unpack("C", substr $blk,20,2);
 370                         #               $h{Wind_Avg_2} = nearest(0.1,mph2mps($tmp/10));
 371                         $tmp = unpack("C", substr $blk,22,2);
 372                         #               $h{Wind_Gust_10} = nearest(0.1,mph2mps($tmp/10));
 373
 374                         #               $h{Dir_Avg_10} = unpack("C", substr $blk,24,2)+0;
 375                         $tmp = unpack("C", substr $blk,30,2);
 376                         $h{Dew_Point} = nearest(0.1, f2c($tmp));
 377
 378                 } else {
 379
 380                         # Older LOOP packet
 381                         $tmp = unpack("C", substr $blk,15,1);
 382                         #               $h{Wind_Avg_10} = nearest(0.1,mph2mps($tmp));
 383                         $h{Dew_Point}  = nearest(0.1, dew_point($h{Temp_Out}, $h{Humidity_Out}));
 384                         $h{Rain_Month}  = nearest(0.1, unpack("s", substr $blk,52,2) * $rain_mult);
 385                         $h{Rain_Year}  = nearest(0.1, unpack("s", substr $blk,54,2) * $rain_mult);
 386                 }
 387
 388                 my $ts = time;
 389                 my $s;
 390                 my $dayno = int($ts/86400);
 391                 if ($dayno > $ld->{last_day}) {
 392                         $ld->{Temp_Out_Max} = $ld->{Temp_Out_Min} = $temp;
 393                         $ld->{Temp_Out_Max_T} = $ld->{Temp_Out_Min_T} = clocktime($ts, 0);
 394                         $ld->{last_day} = $dayno;
 395                         write_ld();
 396                         cycle_loop_data_files();
 397                 }
 398                 if ($temp > $ld->{Temp_Out_Max}) {
 399                         $ld->{Temp_Out_Max} = $temp;
 400                         $ld->{Temp_Out_Max_T} = clocktime($ts, 0);
 401                         write_ld();
 402                 }
 403                 if ($temp < $ld->{Temp_Out_Min}) {
 404                         $ld->{Temp_Out_Min} = $temp;
 405                         $ld->{Temp_Out_Min_T} = clocktime($ts, 0);
 406                         write_ld();
 407                 }
 408
 409                 if ($ts >= $ld->{last_hour} + 1800) {
 410                         $h{Pressure_Trend}    = unpack("C", substr $blk,3,1);
 411                         $h{Pressure_Trend_txt} = $bar_trend{$h{Pressure_Trend}};
 412                         $h{Batt_TX_OK}  = (unpack("C", substr $blk,86,1)+0) ^ 1;
 413                         $h{Batt_Console}  = nearest(0.01, unpack("s", substr $blk,87,2) * 0.005859375);
 414                         $h{Forecast_Icon}  = unpack("C", substr $blk,89,1);
 415                         $h{Forecast_Rule}  = unpack("C", substr $blk,90,1);
 416                         $h{Sunrise}  = sprintf( "%04d", unpack("S", substr $blk,91,2) );
 417                         $h{Sunrise}  =~ s/(\d{2})(\d{2})/$1:$2/;
 418                         $h{Sunset}   = sprintf( "%04d", unpack("S", substr $blk,93,2) );
 419                         $h{Sunset}  =~ s/(\d{2})(\d{2})/$1:$2/;
 420                         $h{Temp_Out_Max} = $ld->{Temp_Out_Max};
 421                         $h{Temp_Out_Min} = $ld->{Temp_Out_Min};
 422                         $h{Temp_Out_Max_T} = $ld->{Temp_Out_Max_T};
 423                         $h{Temp_Out_Min_T} = $ld->{Temp_Out_Min_T};
 424
 425
 426                         if ($loop_count) {      # i.e not the first
 427                                 my $a = wind_average(scalar @{$ld->{wind_hour}} ? @{$ld->{wind_hour}} : {w => $h{Wind}, d => $h{Dir}});
 428
 429                                 $h{Wind_1h} = nearest(0.1, $a->{w});
 430                                 $h{Dir_1h} = nearest(0.1, $a->{d});
 431
 432                                 $a = wind_average(@{$ld->{wind_min}});
 433                                 $h{Wind_1m} = nearest(0.1, $a->{w});
 434                                 $h{Dir_1m} = nearest(1, $a->{d});
 435
 436                                 ($h{Rain_1m}, $h{Rain_1h}, $h{Rain_24h}) = calc_rain($rain);
 437                         }
 438                         $ld->{last_rain_min} = $ld->{last_rain_hour} = $rain;
 439
 440                         $last_hour_h = {%h};
 441                         $s = genstr($ts, 'h', \%h);
 442                         $ld->{lasthour_h} = $s;
 443
 444                         $ld->{last_hour} = int($ts/1800)*1800;
 445                         $ld->{last_min} = int($ts/60)*60;
 446                         @{$ld->{wind_hour}} = ();
 447                         @{$ld->{wind_min}} = ();
 448
 449                         if ($s) {
 450                                 output_str($s, 1);
 451                                 push @last5daysh, $s;
 452                                 shift @last5daysh if @last5daysh > 5*24;
 453                         }
 454                         write_ld();
 455
 456                 } elsif ($ts >= $ld->{last_min} + 60) {
 457                         my $a = wind_average(@{$ld->{wind_min}});
 458                         my %save;
 459
 460                         push @{$ld->{wind_hour}}, $a;
 461
 462                         if ($loop_count) {      # i.e not the first
 463                                 my $rm;
 464
 465                                 $h{Wind_1m} = nearest(0.1, $a->{w});
 466                                 $h{Dir_1m} = nearest(1, $a->{d});
 467                                 ($h{Rain_1m}, $h{Rain_1h}, $h{Rain_24h}) = calc_rain($rain);
 468                         }
 469                         $ld->{last_rain_min} = $rain;
 470
 471                         $h{Temp_Out_Max} = $ld->{Temp_Out_Max};
 472                         $h{Temp_Out_Min} = $ld->{Temp_Out_Min};
 473                         $h{Temp_Out_Max_T} = $ld->{Temp_Out_Max_T};
 474                         $h{Temp_Out_Min_T} = $ld->{Temp_Out_Min_T};
 475
 476                         $last_min_h = {%h};
 477                         $s = genstr($ts, 'm', \%h);
 478                         $ld->{lastmin_h} = $s;
 479
 480                         $ld->{last_min} = int($ts/60)*60;
 481                         @{$ld->{wind_min}} = ();
 482
 483                         output_str($s, 1) if $s;
 484                         write_ld();
 485
 486                 } else {
 487                         my $o = gen_hash_diff($ld->{last_h}, \%h);
 488                         if ($o) {
 489                                 $s = genstr($ts, 'r', $o);
 490                                 push @last10minsr, $s;
 491                                 shift @last10minsr if @last10minsr > 240;
 492                         }
 493                         else {
 494                                 dbg "loop rec not changed" if isdbg 'chan';
 495                         }
 496                         output_str($s, 0) if $s;
 497                 }
 498                 $ld->{last_h} = \%h;
 499                 ++$loop_count;
 500         } else {
 501                 dbg "CRC check failed for LOOP data!";
 502         }
 503         return;
 504 }
 505
 506 sub genstr
 507 {
 508         my $ts = shift;
 509         my $let = shift;
 510         my $h = shift;
 511
 512         my $j =  $json->encode($h);
 513         my $tm = clocktime($ts, 1);
 514         return qq|{"tm":"$tm","t":$ts,"$let":$j}|;
 515 }
 516
 517 sub clocktime
 518 {
 519         my $ts = shift;
 520         my $secsreq = shift;
 521         my ($sec,$min,$hr) = (gmtime $ts)[0,1,2];
 522         my $s;
 523         if ($secsreq) {
 524                 $s = sprintf "%02d:%02d:%02d", $hr, $min, $sec;
 525         } else {
 526                 $s = sprintf "%02d:%02d", $hr, $min;
 527         }
 528         return $s;
 529 }
 530
 531 sub output_str
 532 {
 533         my $s = shift;
 534         my $logit = shift;
 535
 536         dbg $s;
 537 #       say $s;
 538         $dlog->writenow($s) if $logit;
 539         foreach my $ws (keys $WS) {
 540                 my $tx = $WS->{$ws};
 541                 if ($tx) {
 542                         $tx->send($s);
 543                 } else {
 544                         delete $WS->{$tx};
 545                 }
 546         }
 547 }
 548
 549 sub gen_hash_diff
 550 {
 551         my $last = shift;
 552         my $now = shift;
 553         my %o;
 554         my $count;
 555
 556         while (my ($k, $v) = each %$now) {
 557                 if (!exists $last->{$k} || $last->{$k} ne $now->{$k}) {
 558                         $o{$k} = $v;
 559                         ++$count;
 560                 }
 561         }
 562         return $count ? \%o : undef;
 563 }
 564
 565 sub dew_point
 566 {
 567         my $temp = shift @_;
 568         my $rh   = shift @_;
 569
 570         #  Using the simplified approximation for dew point
 571         #  Accurate to 1 degree C for humidities > 50 %
 572         #  http://en.wikipedia.org/wiki/Dew_point
 573
 574         my $dewpoint = $temp - ((100 - $rh) / 5);
 575
 576         # this is the more complete one (which doesn't work)
 577         #my $a = 6.1121;
 578         #my $b = 18.678;
 579         #my $c = 257.14;
 580         #my $ytrh = log(($rh/100) + ($b * $temp) / ($c + $temp));
 581         #my $dewpoint = ($c * $ytrh) / ($b - $ytrh);
 582
 583         return $dewpoint;
 584 }
 585
 586 sub CRC_CCITT
 587 {
 588     # Expects packed data...
 589     my $data_str = shift @_;
 590
 591         my $crc = 0;
 592         my @lst = split //, $data_str;
 593         foreach my $data (@lst) {
 594                 my $data = unpack("c",$data);
 595
 596                 my $crc_prev = $crc;
 597                 my $index = $crc >> 8 ^ $data;
 598                 my $lhs = $crc_table[$index];
 599                 #print "lhs=$lhs, crc=$crc\n";
 600                 my $rhs = ($crc << 8) & 0xFFFF;
 601                 $crc = $lhs ^ $rhs;
 602
 603
 604         }
 605
 606         return $crc;
 607 }
 608
 609 sub f2c
 610 {
 611         return ($_[0] - 32) * 5/9;
 612 }
 613
 614 sub mph2mps
 615 {
 616         return $_[0] * 0.44704;
 617 }
 618
 619 sub in2mb
 620 {
 621         return $_[0] * 33.8637526;
 622 }
 623
 624 sub wind_average
 625 {
 626         my ($sindir, $cosdir, $wind);
 627         my $count;
 628
 629         foreach my $r (@_) {
 630                 $wind += $r->{w};
 631                 $sindir += sin(d2r($r->{d})) * $r->{w};
 632                 $cosdir += cos(d2r($r->{d})) * $r->{w};
 633                 ++$count;
 634         }
 635
 636         my $avhdg = r2d(atan2($sindir, $cosdir));
 637         $avhdg += 360 if $avhdg < 0;
 638         return {w => nearest(0.1,$wind / $count), d => nearest(0.1,$avhdg)};
 639 }
 640
 641 # radians to degrees
 642 sub r2d
 643 {
 644     my $n = shift;
 645     return ($n / pi) * 180;
 646 }
 647
 648 # degrees to radians
 649 sub d2r
 650 {
 651     my $n = shift;
 652     return ($n / 180) * pi;
 653 }
 654
 655 sub calc_rain
 656 {
 657         my $rain = shift;
 658
 659         $ld->{rain24} ||= [];
 660
 661         my $Rain_1h = nearest(0.1, $rain >= $ld->{last_rain_hour} ? $rain - $ld->{last_rain_hour} : $rain); # this is the rate for this hour, so far
 662         my $rm = nearest(0.1, $rain >= $ld->{last_rain_min} ? $rain - $ld->{last_rain_min} : $rain);
 663         my $Rain_1m = nearest(0.1, $rm);
 664         push @{$ld->{rain24}}, $Rain_1m;
 665         $ld->{rain_24} += $rm;
 666         while (@{$ld->{rain24}} > 24*60) {
 667                 $ld->{rain_24} -= shift @{$ld->{rain24}};
 668         }
 669         my $Rain_24h = nearest(0.1, $ld->{rain_24});
 670         return ($Rain_1m, $Rain_1h, $Rain_24h);
 671 }
 672
 673 sub read_ld
 674 {
 675         unless ($dataf) {
 676                 $dataf = IO::File->new("+>> $datafn") or die "cannot open $datafn $!";
 677                 $dataf->autoflush(1);
 678         }
 679
 680         seek $dataf, 0, 0;
 681         my $s = <$dataf>;
 682         chomp $s;
 683         dbg "read loop data: $s" if isdbg 'json';
 684         $ld = $json->decode($s) if length $s;
 685
 686         # sort out rain stats
 687         my $c;
 688         if ($ld->{rain24} && ($c = @{$ld->{rain24}}) < 24*60) {
 689                 my $diff = 24*60 - $c;
 690                 unshift @{$ld->{rain24}}, 0 for 0 .. $diff;
 691         }
 692         my $rain;
 693
 694         if ($ld->{rain24}) {
 695                 $rain += $_ for @{$ld->{rain24}};
 696         }
 697
 698         $ld->{rain_24} = nearest(0.1, $rain);
 699         delete $ld->{hour};
 700         delete $ld->{min};
 701 }
 702
 703 sub write_ld
 704 {
 705         unless ($dataf) {
 706                 $dataf = IO::File->new("+>> $datafn") or die "cannot open $datafn $!";
 707                 $dataf->autoflush(1);
 708         }
 709
 710         seek $dataf, 0, 0;
 711         truncate $dataf, 0;
 712         $ld->{ts} = time;
 713         my $s = $json->encode($ld);
 714         dbg "write loop data: $s" if isdbg 'json';
 715         print $dataf "$s\n";
 716 }
 717
 718 sub cycle_loop_data_files
 719 {
 720         $dataf->close if $dataf;
 721         undef $dataf;
 722
 723         rename "$datafn.oooo", "$datafn.ooooo";
 724         rename "$datafn.ooo", "$datafn.oooo";
 725         rename "$datafn.oo", "$datafn.ooo";
 726         rename "$datafn.o", "$datafn.oo";
 727         copy $datafn, "$datafn.o";
 728 }
 729
 730 sub grab_history
 731 {
 732         my $lg = shift;
 733         my $let = shift;
 734         my $start = shift || time - 86400;
 735         my $dayno = shift;
 736         my @out;
 737
 738         if ($lg->open($dayno, 'r+')) {
 739                 while (my $l = $lg->read) {
 740                         next unless $l =~ /,"$let":/;
 741                         my ($t) = $l =~ /"t":(\d+)/;
 742                         if ($t && $t >= $start) {
 743                                 push @out, $l;
 744                         }
 745                 }
 746                 $lg->close;
 747         }
 748         return @out;
 749 }