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nuttx-apps/system/psmq
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Gregory Nutt 73ab5e2750 Remove some cases in Kconfig files of 'comment' with 'depends on'. That is probably a good practice. I removed these because (1) is not done elsewhere so it is just an inconsistency, and (2) the HTML generation tool at nuttx/tools/kconfig2html.c would need to be extended to parse that case. I don't have time to do that now.
2019-05-19 09:49:50 -06:00
..
.gitignore apps/system/psmq: New package. psmq is publish subscribe message queue. It's a set of programs and libraries to implement publish/subscribe way of inter-process communication on top of POSIX message queue. 2019-02-18 17:47:34 -06:00
Kconfig Remove some cases in Kconfig files of 'comment' with 'depends on'. That is probably a good practice. I removed these because (1) is not done elsewhere so it is just an inconsistency, and (2) the HTML generation tool at nuttx/tools/kconfig2html.c would need to be extended to parse that case. I don't have time to do that now. 2019-05-19 09:49:50 -06:00
Make.defs apps/system/psmq: New package. psmq is publish subscribe message queue. It's a set of programs and libraries to implement publish/subscribe way of inter-process communication on top of POSIX message queue. 2019-02-18 17:47:34 -06:00
Makefile apps/system/psmq: New package. psmq is publish subscribe message queue. It's a set of programs and libraries to implement publish/subscribe way of inter-process communication on top of POSIX message queue. 2019-02-18 17:47:34 -06:00
README.txt apps/system/psmq/README.txt: Add a README.txt file. This is just a copy of the description accompanying that patch that added system/psmq. 2019-02-18 17:51:50 -06:00

README.txt 

README.txt
==========

psmq is publish subscribe message queue. It's a set of programs and libraries
to implement publish/subscribe way of inter process communication on top of
POSIX message queue.

Manuals, source code and more info at:
https://psmq.kurwinet.pl


Little demo using psmqd broker, psmq_pub and psmq_sub:

# start broker and make it log to file
  nsh> psmqd -b/brok -p/sd/psmqd/psmqd.log

# start subscribe thread that will read all messages send on /can/* topic
  nsh> psmq_sub -n/sub -b/brok -t/can/* -o/sd/psmq-sub/can.log
  n/connected to broker /brok
  n/subscribed to /can/*
  n/start receiving data

# publish some messages
  nsh> psmq_pub -b/brok -t/can/engine/rpm -m50
  nsh> psmq_pub -b/brok -t/adc/volt -m30
  nsh> psmq_pub -b/brok -t/can/room/10/temp -m23
  nsh> psmq_pub -b/brok -t/pwm/fan1/speed -m300

# check out subscribe thread logs
  nsh> cat /sd/psmq-sub/can.log
  [1970-01-01 00:00:53] topic: /can/engine/rpm, priority: 0, paylen: 3, payload:
  [1970-01-01 00:00:53] 0x0000  35 30 00                                         50.
  [1970-01-01 00:00:58] topic: /can/room/10/temp, priority: 0, paylen: 3, payload:
  [1970-01-01 00:00:58] 0x0000  32 33 00                                         23.

As you can see /adc/volt and /pwm/fan1/speed haven't been received by subscribe
thread.

Content:

* psmqd - broker, relays messages between clients
* psmq_sub - listens to specified topics, can be used as logger for
  communication (optional)
* psmq_pub - publishes messages directly from shell. Can send binary data, but
  requires pipes, so on nuttx it can only send ASCII.
* libpsmq - library used to communicate with the broker and send/receive
  messages