import rrdtool
import serial
def rrd_create(tstamp, addr, **kwargs):
  # ... prep to create new .rrd file
  rrdtool.create(r.dbname, *args)

def rrd_update(tstamp, addr, **kwargs):
  # ... prep to update .rrd file with new data
  rrdtool.update(r.dbname, arg)

sport = serial.Serial(SPORT, BAUD)
sport.open()
  while 1:
    try:
      x = sport.readline().strip()
      y = eval("dict(%s)" % x)  # well, it's a demo!
      y["tstamp"] = int(time.time())
      if not SENSORS.has_key(y["addr"]):
        rrd_create(**y)
      rrd_update(**y)
    except:
      print "ERROR:", sys.exc_info()

python sensorlogger.py -p /dev/ttyUSB0 -D
python sensorserver.py -v
python tableserver.py -v

  #include <stdlib.h>
  #include "board.h"
  #include "radio.h"

  volatile app_evnt_t app_evnt;

  int main(void) {
      app_init();
      while (1) {
          app_task();
          do_sleep();
      }
  }

  static void app_init(void) {
      sensor_init();
      timer_init();
      radio_init(NULL, 0);
      app_event = APP_IDLE;
  }

  static void app_task(void) {
      if (app_event == APP_MEASURE) {
          run_measurement();
          radio_set_state(STATE_TXAUTO);
          radio_send_frame(sizeof(TxFrame), (uint8_t *) &TxFrame, 0);
          app_event = APP_IDLE;
      }
  }

  /* radio IRQ callback - startet timer nach senden des Rahmens */
  void usr_radio_tx_done(radio_tx_done_t status) {
      timer_start(tmr_transmit, T_TX_PERIOD, 0);
  }

  /* timer callback */
  time_t tmr_transmit(timer_arg_t t) {
      app_event = APP_MEASURE;
      return 0;
  }

import SimpleHTTPServer
import SocketServer

GLOBDSLIST=[
 [ "vmcu", "Supply", "V"],
 [ "sht_t", "Temperature", "C" ],
 [ "sht_rh", "Humidity", "%" ],
]
# ...
def build_sensor_html_table():
  global RRDFILES
  x = glob.glob("%s/sensor_*.rrd" % WORKDIR)
  for fname in x:
    rdlast=rrdtool.last(fname)
    if time.time() - rdlast > 15:
      # ...
    else:
      rinfo = rrdtool.info(fname)
      for dsi in GLOBDSLIST:
        ik="ds[%s].last_ds" % (ds[0])
        if rinfo.has_key(ik):
          ret += "<td>%.3f</td>" % ( float(rinfo[ik]) )

# Http Server Class
class CustomHandler(SimpleHTTPServer.SimpleHTTPRequestHandler):
  def do_GET(self):
    self.send_response(200)
    self.send_header('Content-type','text/html')
    self.end_headers()
    txt = build_sensor_html_table()
    self.wfile.write(header() + txt + footer())

if __name__ == "__main__":
  httpd = SocketServer.ThreadingTCPServer(('', PORT),CustomHandler)
  httpd.serve_forever()