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wget is missing from some system (like macOS and Windows native), it's better to use curl to simplify build environment. Signed-off-by: Huang Qi <huangqi3@xiaomi.com> |
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System / psmq Publish Subscribe Message Queue
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.