Gina

This would seem to be what I want for the ESP32 and BME280 :- ESP32 MQTT – Publish and Subscribe with Arduino IDE

So far so good but I shall only feel I have it working when I have a separate client SBC talking to a client on the RPi or better still on something else.  I have another BME280 which I can put on some stripboard with one of the ESP32s and program to read the indoor temperature, humidity and atmospheric pressure and send it to the broker.  Then I can subscribe to new topics and send data.  That way I can try out the MQTT system without venturing out to the obsy in a deluge and also leave the sensors working for real use.

I've GOT IT!! 😀

Each command has to be on a separate SSH connection to the broker.  The first Terminal is just sitting there waiting for messages from clients.  When another terminal is opened and SSH'd to the broker subscribing to "test" and sending the message "Hello", then "Hello" appears in the first Terminal.

pi@MQTTBrokerGina:~ $ mosquitto_sub -h localhost -t “test”

“Hello”

The MQTT system is working albeit with broker and clients on the same machine (RPi).  😀

Tried rebooting - not solved it though.

pi@MQTTBrokerGina:~ $ sudo reboot
Connection to mqttbrokergina closed by remote host.
Connection to mqttbrokergina closed.
gina@Mint-Desktop ~ $ ssh pi@MQTTBrokerGina
pi@mqttbrokergina's password: 
Linux MQTTBrokerGina 5.4.51+ #1333 Mon Aug 10 16:38:02 BST 2020 armv6l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Fri Aug 14 17:45:07 2020 from 192.168.1.79
pi@MQTTBrokerGina:~ $ mosquitto_sub -h localhost -t “test”

And there it sits doing nothing!  Evidently I'm not understanding this.  Can someone please tell me what I'm doing wrong?

OK...  Running this sequence :-

Quote

1.     Starting with a fresh installation of Raspbian Buster Lite (burned here with Balena Etcher), enter sudo apt update then sudo apt upgrade in the command line to make sure you’ve got the latest and greatest running on your system.

2.     Add the open source MQTT broker Mosquitto, along with Mosquitto client software on the Pi with sudo apt-get install mosquitto mosquitto-clients.

3.     The new host address will be the IP address of the Pi, which is available by typing ifconfig. Installation will start the broker and allow it to start on boot. The mosquitto-clients portion of the install allows you to run a client on the machine as well as a broker.

4.     In the Pi terminal, subscribe to the test topic with the command mosquitto_sub -h localhost -t “test”. This sends a subscription message to the MQTT broker running on the same system and lets it listen to any messages sent to this topic.

Sections 1. to 3. completed.  In section 3. ifconfig confirms the IP address as correct.  In section 4. I copied the command into the Terminal but nothing happened.  Does the RPi need rebooting or am I completely misunderstanding this?

Next job is :-  Setup MQTT Server on Raspberry Pi Zero

This installs both the Mosquitto broker and clients so the RPi can be used as both broker and a client.  I may use it for either the indoors sensors or the mechanical weather wall display with several dials and gauges.  Thinking of the latter as the RPi has lots of GPIO pins.

That completes setting up the Pi Zero W for headless SSH access over WiFi.

Now running the usual :-

sudo apt-get update -y
sudo apt-get upgrade -y

That was it - I'm in 😀

gina@Mint-Desktop ~ $ ssh pi@MQTTBrokerGina
The authenticity of host 'mqttbrokergina (192.168.1.250)' can't be established.
ECDSA key fingerprint is SHA256:eH9cpckOI0MiUwVEkp18LQ17PoYs0DoJtoLHcePf5yg.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'mqttbrokergina' (ECDSA) to the list of known hosts.
pi@mqttbrokergina's password: 
Linux MQTTBrokerGina 4.19.118+ #1311 Mon Apr 27 14:16:15 BST 2020 armv6l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Fri Aug 14 16:38:52 2020 from 192.168.1.79
pi@MQTTBrokerGina:~ $ 

Looks like another restart!!  Maybe it doesn't like that host name.  Checking Network Clients on router...

Aha - no underlines.

Not surprisingly, I think I've done something wrong in changing host name and password.  I decided on a host name of MQTT_Broker_Gina though this system seems to ignore case unlike most Linux systems.

gina@Mint-Desktop ~ $ ssh pi@raspberrypi
The authenticity of host 'raspberrypi (192.168.1.250)' can't be established.
ECDSA key fingerprint is SHA256:eH9cpckOI0MiUwVEkp18LQ17PoYs0DoJtoLHcePf5yg.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'raspberrypi' (ECDSA) to the list of known hosts.
pi@raspberrypi's password: 
Linux raspberrypi 4.19.118+ #1311 Mon Apr 27 14:16:15 BST 2020 armv6l

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.

SSH is enabled and the default password for the 'pi' user has not been changed.
This is a security risk - please login as the 'pi' user and type 'passwd' to set a new password.

pi@raspberrypi:~ $ sudo raspi-config
New password: 
Retype new password: 
passwd: password updated successfully

Welcome to fdisk (util-linux 2.33.1).
Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.


Command (m for help): Disk /dev/mmcblk0: 14.9 GiB, 15931539456 bytes, 31116288 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x55d719e5

Device         Boot  Start      End  Sectors  Size Id Type
/dev/mmcblk0p1        8192   532479   524288  256M  c W95 FAT32 (LBA)
/dev/mmcblk0p2      532480 31116287 30583808 14.6G 83 Linux

Command (m for help): Partition number (1,2, default 2): 
Partition 2 has been deleted.

Command (m for help): Partition type
   p   primary (1 primary, 0 extended, 3 free)
   e   extended (container for logical partitions)
Select (default p): Partition number (2-4, default 2): First sector (2048-31116287, default 2048): Last sector, +/-sectors or +/-size{K,M,G,T,P} (532480-31116287, default 31116287): 
Created a new partition 2 of type 'Linux' and of size 14.6 GiB.
Partition #2 contains a ext4 signature.

Command (m for help): 
Disk /dev/mmcblk0: 14.9 GiB, 15931539456 bytes, 31116288 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x55d719e5

Device         Boot  Start      End  Sectors  Size Id Type
/dev/mmcblk0p1        8192   532479   524288  256M  c W95 FAT32 (LBA)
/dev/mmcblk0p2      532480 31116287 30583808 14.6G 83 Linux

Command (m for help): The partition table has been altered.
Syncing disks.

Connection to raspberrypi closed by remote host.
Connection to raspberrypi closed.
gina@Mint-Desktop ~ $ ssh pi@raspberrypi
ssh: Could not resolve hostname raspberrypi: Name or service not known
gina@Mint-Desktop ~ $ ssh pi@MQTT_Broker_Gina
ssh: Could not resolve hostname mqtt_broker_gina: Name or service not known
gina@Mint-Desktop ~ $ 

OK.  SSH into RPi Zero and change of host name and password done plus file system expanded.  Now to try SSH with new host name and PW.

I certainly could though what I have in mind is a bit different.  I want temperature, humidity, wind speed, wind direction, rainfall, rain status, cloud status, etc. in addition to pressure and its trends.  Trouble is lack of free wall space.  The space above the fireplace has a giant clock with 3ft dial and many of my watercolour paintings plus router and WiFi AP.  East wall also has paintings and my moon dial clock plus a large bookshelf and air-con unit.  And a window, vintage barometer etc.

I think it's back to square one!  Or almost.  I have the OS in my downloads and the supplicant data in the editor.  Seems I won't need keyboard or monitor connected to the RPi Zero.

Got as far as password again.

gina@Mint-Desktop ~ $ ssh 192.168.1.250
The authenticity of host '192.168.1.250 (192.168.1.250)' can't be established.
ECDSA key fingerprint is SHA256:lEMA9QPPY5y8I57L7qlLbXpK95DZXF8hlbdZJJPvtd0.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added '192.168.1.250' (ECDSA) to the list of known hosts.
gina@192.168.1.250's password: 
Permission denied, please try again.
gina@192.168.1.250's password: 
Permission denied, please try again.
gina@192.168.1.250's password: 

Where is the user password stored?  Can I change it by editing a file?  Or do I have to start again and use the default PW "raspberry".  Neither that or the one I set up now work.

Put empty file SSH into boot directory and made wpa_supplicant.conf file with the info in it.

gina@Mint-Desktop / $ cd media
gina@Mint-Desktop /media $ ls
gina
gina@Mint-Desktop /media $ cd gina
gina@Mint-Desktop /media/gina $ ls
3630-3533  512-NTFS-1  512-NTFS-2  6363-3732  boot  rootfs  ssdata2
gina@Mint-Desktop /media/gina $ cd boot
gina@Mint-Desktop /media/gina/boot $ ls
bcm2708-rpi-b.dtb         COPYING.linux  LICENCE.broadcom
bcm2708-rpi-b-plus.dtb    fixup4cd.dat   overlays
bcm2708-rpi-cm.dtb        fixup4.dat     ssh
bcm2708-rpi-zero.dtb      fixup4db.dat   start4cd.elf
bcm2708-rpi-zero-w.dtb    fixup4x.dat    start4db.elf
bcm2709-rpi-2-b.dtb       fixup_cd.dat   start4.elf
bcm2710-rpi-2-b.dtb       fixup.dat      start4x.elf
bcm2710-rpi-3-b.dtb       fixup_db.dat   start_cd.elf
bcm2710-rpi-3-b-plus.dtb  fixup_x.dat    start_db.elf
bcm2710-rpi-cm3.dtb       issue.txt      start.elf
bcm2711-rpi-4-b.dtb       kernel7.img    start_x.elf
bootcode.bin              kernel7l.img   wpa_supplicant.conf
cmdline.txt               kernel8.img
config.txt                kernel.img
gina@Mint-Desktop /media/gina/boot $ 

Now to see if it works.  ie. if I can SSH into the RPi Zero.

Have microSD card in card reader and there's no SSH file and no wpa_supplicant.conf and yet I had SSH working over WiFi on the RPi 3B+.  Guess the problem I had deleted these.

I'll check the data on the card. 

I thought of a wired connection but when I came to plug the Ethernet cable into the RPi - lo and behold - no Ethernet port, so it has to be WiFi.

👍

The RPi Zero has arrived.  Not sure I can use it yet though as I'm waiting for delivery of a mini HDMI cable.  Depends if it will work with the microSD card I produced for the RPi 3B+  Have to say, I'm impressed with The Pi Hut - with RM 24 delivery.

It's always the fiddly little bits that take the time!!

So the drizzle we have here doesn't extend as far east as you then Dave!

Glad to have a more optimistic opinion!  😁

As per the topic title, I would welcome opinions on the best rain sensor/detector, please.  I'm gradually getting nearer to getting my ROR automation ready.

Guess I'll just have to keep my fingers crossed then.  Might be a good idea to have the rain sensor on the same unit as the roof controller (as in the current design which doesn't use MQTT).  No particular reason to have it connected to a different one anyway.