Advanced Meshtastic - LoRa Configuration

4 місяці тому

Welcome to part three in the Advanced Meshtastic Series where we continue going over the Radio Configuration settings and take a deep dive into LoRa and the Chirp Spread Spectrum it uses that allows for long distance communications at low power.
More info on Meshtastic can be found at
meshtastic.org/
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КОМЕНТАРІ: 77

@nomercyriding 4 дні тому

It always just blows my mind that this level of presentation and knowledge is available to all for free. Thank you for taking the time to make these videos.

@The_Comms_Channel 4 дні тому

Sure thing! I hope the videos have been helpful!

@Liberty4Ever 2 місяці тому

This was a great explanation! I loved the use of SDR to demonstrate the various parameters. I'm impressed that the Meshtastic app allows this much control over the configuration. Among other things, this provides a bit more privacy when configured to a nonstandard configuration. Even though encryption protects the contents of the message, sometimes I may not want people realizing that I'm communicating even if they don't know what I'm saying. 902 to 928 MHz are available for ISM in the US.

@The_Comms_Channel 2 місяці тому

Thanks! It was a fun video to make and cool to see on the SDRs waterfall!

@rEdf196 2 місяці тому

I've had an interest in Meshtastic for over a month. after watching many videos on it. I did build a tiny 915 MHz ground plane antenna connected to my RTL SDR monitoring the frequencies between 902 to 928 MHz and found many, mostly 200 KHz wide blips in varying signal strengths which look and sound like those speeded up chirps on your video, a good sign there is local Mesh action in my area.

@Meshtastic 4 місяці тому

Great explanation of LoRA parameters! ♥

@The_Comms_Channel 4 місяці тому

Thank you!!

@1718bb 11 днів тому

You are very good at explaining things. Thank you.

@The_Comms_Channel 11 днів тому

Glad it was helpful!

@the_mad_swimbaiter455 4 місяці тому

Got my t echo in route. Thanks for this series!

@The_Comms_Channel 4 місяці тому

Nice! Sure thing! I'm glad you're enjoying the series.

@catalinalb1722 4 місяці тому

T Echo & T beam supreme are on the way from China. I built two yagi antennas and did not manage to have a connection btw Antibes and Nice over the sea. I currently have old version of tbeam 0.7....

@Gremlin87 3 місяці тому

Thank you for putting all this information together for us!

@The_Comms_Channel 3 місяці тому

Sure thing! Glad you're finding the videos helpful!

@suzyamerica4679 3 місяці тому

Thank you for posting all this. Received some Heltec v3's the other day and have been trying to interact with the local net. Feared it was bad settings somehow.

@S2Underground 4 місяці тому

Good stuff! 👍

@The_Comms_Channel 4 місяці тому

Appreciate it! Watching your video now. Great info!

@innercityprepper 4 місяці тому

Man you are just killing it! Thank you!

@wpherigo1 4 місяці тому

Well done. Very useful.

@mikeperry2561 2 місяці тому

Wow, an amazing amount of info and explanation.

@The_Comms_Channel 2 місяці тому

Thank you! I'm glad you found the video informative!

@cowboy898 4 місяці тому

Excellent job.

@The_Comms_Channel 4 місяці тому

Thanks!

@tonyweavers4292 2 місяці тому

Great explanation, many thanks.

@The_Comms_Channel 2 місяці тому

Glad it was helpful!

@MyTube4Utoo 2 місяці тому

Thank you!

@Disastercommunications 4 місяці тому

Great job. Will link this video.

@DeputatKaktus 4 місяці тому

Thank you very much indeed for this series. It helped me getting started. I have a few more boards en route. One headless router and / or repeater will be placed at the local makerspace shortly. Maybe I can get few more started in other places. Thanks again! 😊

@The_Comms_Channel 4 місяці тому

Sure thing! I'm glad you're finding the series helpful! That'll be a nice setup 😃

@FlinFarmer 4 місяці тому

Awsome. keep them coming. This is the info I need.

@The_Comms_Channel 4 місяці тому

Appreciate it! Will do!

@danielturecek 4 місяці тому

Great informations. Thank you very much...

@The_Comms_Channel 4 місяці тому

Sure thing! I'm glad you found it useful!

@jac_mac 13 днів тому

Great Video and explanation. Could you please make a video showing just how you were able to make the bandwidth changes on the fly? Looks like you're using an arduino program to make the changes but how is it connected to the radio. Would be interested into seeing how you actually set that up. Thanks in advance,

@andrewborntrager7909 2 місяці тому

Nerd stuff at it's finest! Thank you for the great video.

@The_Comms_Channel 2 місяці тому

Sure thing!! Glad you enjoyed it!

@RoguePlank 4 місяці тому

Excellent vid

@The_Comms_Channel 4 місяці тому

Thank you!

@Sumguysazz 4 місяці тому

Nice!

@crackerwood661 4 місяці тому

Thanks!

@The_Comms_Channel 4 місяці тому

Thank you so much for the support!

@TonyLing 3 місяці тому

Thanks

@The_Comms_Channel 3 місяці тому

Sure thing!

@baileymartin4355 4 місяці тому

I love your videos. They are super helpful! Will you be doing any videos dedicated to MQTT and setting up internet tunnels?

@The_Comms_Channel 3 місяці тому

Yep, there will be content on MQTT!

@jankapon9995 4 місяці тому

Thanks for this video, it's great! In my T-Deck I used the default LONG_FAST channel and the transmission bandwidth received by my RTL-SDR is 256 kHz. Based on your video I started to wonder if it should not be by default lower for the long range communication?

@The_Comms_Channel 4 місяці тому

Sure thing! The developers made Long-Fast the default since it's a good balance of distance and speed. The slower settings really do get congested after the number of nodes grow

@rrochsr 4 місяці тому

thanks for good info at the right level. thought about doing a section on antennas and placement?

@The_Comms_Channel 4 місяці тому

Sure thing! I do have a video on antennas. I'll link it here. ukposts.info/have/v-deo/fmaoaIerkHtnrWw.html

@The_Comms_Channel 4 місяці тому

Sure thing! I do have a video on antennas. I'll link it here. ukposts.info/have/v-deo/fmaoaIerkHtnrWw.html

@fernandob7475 4 місяці тому

Thanks for the video, much better than reading! I would love to learn more about your SDR setup to capture those signals and demonstrate it. Did you use a filter?

@The_Comms_Channel 4 місяці тому

Sure thing! Nothing special on the SDR side. The key is changing the LoRa transmitter settings, especially bandwidth.

@bobyrd74 3 місяці тому

I assume the SX126X RX boosted gain option is also valid for selection on/off when using the newer SX127X?

@StevensonGphotos 4 місяці тому

Thanks for the series! I'm curious, with regard to the hop setting and the default of 3. if a packet or message passes through a node set up as router, does the count get reset? The maximum of 7 hops seems kind of limiting for a network that could theoretically cover a pretty big area.

@The_Comms_Channel 4 місяці тому

Sure thing! Devices setup as router/repeater don't reset the hop count. High hop counts really make too much network congestion.

@XRinger 4 місяці тому

I'm a Ham interested in LoRa coms. Thinking about getting three radios, 2 in our cars and one connected to a high gain vertical antenna on my ham tower. This should give us good coverage in the local area. But, my Smart home equipment is from YoLink using LoRa. I fear the 915 MHz environment here is going to be too polluted. Every YoLink device has a radio running. Will a com receiver be De-sensed by my YoLink system?

@The_Comms_Channel 4 місяці тому

It should be fine. I have a number of devices on 915MHz like my weather station, soil sensors, ect. No issues so far.

@BracaPhoto 3 місяці тому

Once setup - does the receiver accept only one type of transmission (long-fast) Or will it listen for all transmission types ?

@The_Comms_Channel 3 місяці тому

Settings need to match with the transmitter.

@magnitudematrix2653 3 місяці тому

You could experiment with laser comms.

@kevinroberts781 2 місяці тому

Is that hop limit explained correctly? I thought that hop limit refered to how many times a node retransmitted the same data. If the mesh only allows a msg to travel through 3 nodes/3 hops it won't make it very far?

@The_Comms_Channel 2 місяці тому

The node with the lowest signal (and likely furthest away) will rebroadcast first to ensure that the hops are reaching as far as they can.

@kevinroberts781 2 місяці тому

@@The_Comms_Channel I see I think. So if a node knows for a fact that the msg was received it will continue to transmit it to the next node. On and on and on?

@TjaudioNet 4 місяці тому

How are you getting the node to constantly TX in order to view it on SDR#? I can see the signal when I TX a message, but I can't seem to get it to constantly TX.

@The_Comms_Channel 4 місяці тому

I'm using a very narrow bandwidth (12kHz) in order to see the LoRa signal. I don't believe you can set that in the Meshtastic app, so I'm using some code from RAK Wireless GitHub page and setting the bandwidth there

@TjaudioNet 4 місяці тому

@@The_Comms_Channel oh. That's pretty cool

@jyunte 4 місяці тому

Can you go over adding a private channel, for use on a local mesh? I've gone to the Channel menu (4th icon from left) and clicked on the name Field, I clicked "Add", entered a channel name, then clicked save. I clicked on Send and it presents me with a QR code. When I scan the QR code on another device that's connected to the public MQTT server on channel zero, all traffic to/from the MQTT server ceases. My understanding from the documentation was that traffic on channel zero would always be sent and received and that each node with the same channel 1 (for example) setup could talk to each other. That doesn't happen with me. Once I switch to channel 1, the newly set up private channel, by going to Radio Configuration... Channel... And clicking on the new private channel all traffic ceases. What am I doing wrong? Do you have to "switch" channels to send a message on Channel 0 and switch again to Channel 1 (private channel) if you want to send a private message to a node on Channel 1? How do you start a conversation on the private channel if you've not communicated with that node before?

@Evanito 4 місяці тому

Hey there, you found an issue I also agree is underdocumented. Until it gets fixed, I can give you a few pointers that should get you unstuck. When sending a message (and 1 and 2 count with MQTT as well) ALL of the following need to match on both devices: 1. LoRa modem preset: If you added a private channel, this probably changed! Double check that the "LoRa channel" is set to 20 if you are using the default LongFast. It's fine if it's 0 unless you added a private primary channel, then you need to change it back to 20 to work with the public mesh. 2. Channel PSK: You added a private channel, I'm sure you got the PSK right, just needs to match. 3. Channel Name: This is the kicker, over Radio AND MQTT, the encryption (and MQTT topics) use the name of the channel to know which PSK to use on the receiver. If sender and receiver have the same channel PSK but different names, there won't be a message received. Bonus tip: Direct messages only work if sender and receiver have identical primary channels per above :) I hope the above can be further documented officially (or improved) soon My sources are experimentation, and some chats with the devs

@jyunte 4 місяці тому

[Update:] Maybe this was an MQTT issue, as, after several hours, I started receiving messages without me changing anything! [Was:] Thanks for your help. A more important problem has arisen! I have 3 nodes, one is connected to the public MQTT server, the other two can each talk to each other and i send messages to the MQTT server. All was well until 8 days ago... Then, one message would get sent again, and again, and again, at least once every time I cold booted a node... For more than 8 days! This evening, I reset all nodes to factory settings, deleted the Meshtastic app and cleared it's cache and data prior to reinstalling the app and reconfiguring the nodes. Reconfiguring them is pretty easy... Each of the three nodes sees the traffic coming from the MQTT server, but no messages are being received from the MQTT server. I've quadruple-checked all the settings and don't understand why none of the nodes is receiving messages. When I send messages, they get the checkmark, but no responses come back. Messages sent from the node connected to the MQTT server show an up arrow, not a checkmark. Something is wrong! I'm seeing 28 of 59 nodes connected. So confused! Getting this to work is easy, but when it goes wrong, it's a total pain. The MQTT node has MQTT and proxy to client enabled. The "LongFast" channel has uplink and downlink enabled and is otherwise at its defaults. The channel settings for the other two nodes are at their defaults. Any suggestions?