@dpcons MQTT sounds intimidating and looks imitimidating when you see all of the options available.
Here's the scenario:
You want to send a message. That's the -m option followed by a space and the message between " "
the location, topic, is a tree, -t option, separated by forward slash / eg. MyRootTopic/MyTopicsSub/MyTopicSubSub
It's as easy as that if your broker, the MQTT service (program) is on the same computer as the sending program. Usually it's not.
Specifiy the location, the host, of the broker with the -h option followed by the host name or IP address
The retain option, -r is important but explaining it is beyone the scope of this message
Receiving, subscribing, to a topic is just the same, but you wouldn't have the -m message
If you subscribe from the command line, the subscribe function waits indefinitely for messages published to the subscribed topic (unless you use the -C option) ^C to terminate the command.
A tamotized device with the MQTT configured will create a number of topics on the broker. Home Assistant will see this automatically, if you have the Tasmota and MQTT Integrations installed.
The MySensors MQTT gateway takes care of MQTT communication for a MySensors device. Again the MySensors and MQTT integrations.
I use both.
-OSD
Over 4 years on, and my node ran continuously sending 4 messages every 5 minutes.
It's 700mAh LiFePo4 battery voltage dropped from initial 3.45V to 3.24V, according to LiFePo4 voltge/SoC tables It's just under 40% left.
700*60% = 420mAh. 100 mAH per year. using library 2.40 and blob message I could cut usage to ~25mAh/year, not bad
@mfalkvidd Yes, I understand that 253 is the software limit. I was wondering about the hardware limit.
For example, my Asus router has a software limit of 253 devices. But when I get 20-25 WiFi devices trying to connect, the network goes haywire. (pun intended ) I am quite convinced that this is a hardware limitation of the router because the router has to carry some information about each connection.
If the gateway is dumb, that is, carries no information about any connection, then it could truly have 253 connections. After a bit of contemplation, I realize that the name, gateway, implies this.
If that is the case, it is good news for the DiY'er in that this very inexpensive and cheap hardware could stand in for a LoRaWAN, again, with a number of compromises.
