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annotate server/ts.py @ 27:dbbd503119ba

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Add some web server handling
author Matt Johnston <matt@ucc.asn.au>
date Tue, 12 Jun 2012 00:09:09 +0800
parents d3e5934fe55c
children e3e0ed7758f9
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #!/usr/bin/env python2.7
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2
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3 BTADDR = "00:12:03:27:70:88"
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4 SLEEP_TIME = 180
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5 # time that the bluetooth takes to get going?
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6 EXTRA_WAKEUP = 0
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7
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8 FETCH_TRIES = 3
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9
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10 # avoid turning off the bluetooth etc.
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11 TESTING = True
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12
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13 import sys
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14 # for wrt
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15 sys.path.append('/root/python')
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16 import httplib
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17 import time
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18 import traceback
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19
26
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20 from utils import monotonic_time, retry, readline, crc16
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22 lightblue = None
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23 try:
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24 import lightblue
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25 except ImportError:
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26 import bluetooth
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27
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28 def get_socket(addr):
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29 if lightblue:
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30 s = lightblue.socket()
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31 s.connect((addr, 1))
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32 s.settimeout(3)
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33 else:
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34 s = bluetooth.BluetoothSocket( bluetooth.RFCOMM )
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35 s.connect((addr, 1))
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36
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37 s.setblocking(False)
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38
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39 return s
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40
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41
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42 @retry()
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43 def fetch(sock):
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44 print "fetch"
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45 sock.send("fetch\n")
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46
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47 crc = 0
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48
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49 lines = []
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50 l = readline(sock)
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51 if l != 'START\n':
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52 print>>sys.stderr, "Bad expected START line '%s'\n" % l.rstrip('\n')
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53 return None
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54 crc = crc16(l, crc)
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55 lines.append(l)
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56
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57 while True:
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58 l = readline(sock)
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59
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60 crc = crc16(l, crc)
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61
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62 if l == 'END\n':
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63 break
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64
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65 lines.append(l.rstrip('\n'))
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67 print lines
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68
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69 l = readline(sock)
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70 recv_crc = None
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71 try:
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72 k, v = l.rstrip('\n').split('=')
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73 print k,v
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74 if k == 'CRC':
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75 recv_crc = int(v)
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76 if recv_crc < 0 or recv_crc > 0xffff:
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77 recv_crc = None
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78 except ValueError:
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79 pass
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80
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81 if recv_crc is None:
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82 print>>sys.stderr, "Bad expected CRC line '%s'\n" % l.rstrip('\n')
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83 return None
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84
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85 if recv_crc != crc:
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86 print>>sys.stderr, "Bad CRC: calculated 0x%x vs received 0x%x\n" % (crc, recv_crc)
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87 return None
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88
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89 return lines
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90
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91 @retry()
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92 def turn_off(sock):
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93 if TESTING:
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94 return None
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95 sock.send("btoff\n");
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96 # read newline
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97 l = readline(sock)
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98 if not l:
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99 print>>sys.stderr, "Bad response to btoff\n"
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100 return None
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101
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102 off, next_wake = l.rstrip().split(':')
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103 if off != 'Off':
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104 print>>sys.stderr, "Bad response to btoff '%s'\n" % l
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105
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106 return int(next_wake)
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107
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108 def do_comms(sock):
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109 print "do_comms"
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110 d = None
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111 # serial could be unreliable, try a few times
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112 for i in range(FETCH_TRIES):
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113 d = fetch(sock)
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114 if d:
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115 break
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116 time.sleep(1)
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117 if not d:
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118 return
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119
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120 res = send_results(d)
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121 if not res:
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122 return
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123
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124 clear_meas(sock)
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125
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126 next_wake = turn_off(sock)
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127 sock.close()
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128 return next_wake
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129
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130 testcount = 0
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131
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132 def sleep_for(secs):
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133 until = monotonic_time() + secs
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134 while True:
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135 length = until - monotonic_time()
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136 if length <= 0:
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137 return
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138 time.sleep(length)
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139
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140 def main():
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141
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142 while True:
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143 sock = None
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144 try:
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145 sock = get_socket(BTADDR)
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146 except Exception, e:
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147 print>>sys.stderr, "Error connecting:"
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148 traceback.print_exc(file=sys.stderr)
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149 sleep_time = SLEEP_TIME
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150 if sock:
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151 next_wake = None
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152 try:
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153 next_wake = do_comms(sock)
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154 except Exception, e:
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155 print>>sys.stderr, "Error in do_comms:"
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156 traceback.print_exc(file=sys.stderr)
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157 if next_wake:
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158 sleep_time = min(next_wake+EXTRA_WAKEUP, sleep_time)
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159
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160 if TESTING:
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161 print "Sleeping for %d" % sleep_time
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162 sleep_for(sleep_time)
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163
885532437100 A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents: 21
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164 if __name__ == '__main__':
885532437100 A bit of work on the server python
Matt Johnston <matt@ucc.asn.au>
parents: 21
diff changeset
165 main()