Yet another library that talks to mooshimeter

Written in C++. Requires Linux. Tested on desktops and Raspberry Pi.

Object instantiation of Mooshimeter class establishes connection with the meter. Constructor has six arguments:

Mooshimeter(const char* hwaddr, uint16_t hin, uint16_t hout,
  std::function<void(const Measurement&)> measurement,
  std::function<void(const Response&)> others,
  bool verbose=false);

hwaddr is an address of the mooshimeter, hin and hout are handles corresponding to input and output streams respectively. Library does not scan for available devices nor read characteristics to discover handles. One can obtain necessary values with hcitool and gatttool commands. Detailed instructions are given in mooshimeter.h file.

measurement is a function that is called every time complete measurement has been read. Function is called from reader thread context. (Library uses three additional threads.)

others is a function that is called for responses that do not belong to measurement data: battery status, logging status etc. Function is called from reader thread context.

Setting verbose to true will print all sent and received packets to output stream.

Mooshimeter class offers two methods.

std::future<std::string> cmd(std::string cmd);

Sends command to the mooshimeter. Returns future object which allows to obtain result. Function is non-blocking and thread safe.

const ConfigTree& get_config_tree();

Returns configuration tree data in read-only mode.

As mentioned above, library is multithreaded. Objects of StdOutExclusiveAccess class are used to avoid data races when printing to output and error streams.

There are three examples included.

• app1

  Configures the mooshimeter (channel 1: voltage 600V, channel 2: current 10A), computes and prints values of arithmetic mean, root square mean, real power for 15 seconds. Load is resistive - a classic 25W bulb. Alternating current had nominal frequence 50 Hz and voltage 230 V.

  % app1
     DATE        TIME             I [A]              U [V]          POWER     V_BAT
                              MEAN      RMS      MEAN      RMS
  2017-04-20 15:30:34.525    -0.001    0.113    -2.139  233.767    26.366       nan
  2017-04-20 15:30:35.068    -0.001    0.113    -2.238  233.685    26.340       nan
  2017-04-20 15:30:35.608    -0.001    0.113    -2.155  234.130    26.393       nan
  2017-04-20 15:30:36.148    -0.001    0.113    -2.152  234.331    26.427       nan
  2017-04-20 15:30:36.688    -0.001    0.113    -2.215  234.051    26.404       nan
  2017-04-20 15:30:37.228    -0.001    0.113    -2.150  234.306    26.440       nan
  2017-04-20 15:30:37.769    -0.001    0.113    -2.132  234.143    26.413       nan
  2017-04-20 15:30:38.311    -0.001    0.113    -2.200  234.062    26.370       nan
  2017-04-20 15:30:38.851    -0.001    0.113    -2.231  234.268    26.404       nan
  2017-04-20 15:30:39.396    -0.001    0.113    -2.136  234.294    26.411       nan
  2017-04-20 15:30:39.937    -0.001    0.113    -2.145  234.061    26.374       nan
  2017-04-20 15:30:40.479    -0.001    0.113    -1.980  234.013    26.399       nan
  2017-04-20 15:30:40.943    -0.001    0.113    -2.052  234.045    26.383     2.996
  2017-04-20 15:30:41.484    -0.001    0.113    -2.115  234.049    26.383     2.996
  2017-04-20 15:30:42.026    -0.001    0.113    -2.312  234.314    26.424     2.996
  2017-04-20 15:30:42.568    -0.001    0.113    -2.118  234.083    26.388     2.996
  2017-04-20 15:30:43.111    -0.001    0.113    -2.133  233.886    26.372     2.996
  2017-04-20 15:30:43.651    -0.001    0.113    -2.200  234.058    26.368     2.996
  2017-04-20 15:30:44.191    -0.001    0.113    -2.174  233.674    26.344     2.996
  2017-04-20 15:30:44.731    -0.001    0.113    -2.158  233.553    26.291     2.996
  2017-04-20 15:30:45.273    -0.001    0.113    -2.234  233.565    26.305     2.996
  2017-04-20 15:30:45.814    -0.001    0.113    -2.152  233.552    26.299     2.996
  2017-04-20 15:30:46.356    -0.001    0.113    -1.916  233.719    26.305     2.996
  %

• app2

  Configures the mooshimeter (channel 1: voltage 600V, channel 2: current 10A), takes a single measurement and creates a plot using gnuplot.

  

• app3

  Updates mooshimeter clock.