I installed a new Indoor Gateway in my house a couple of days ago. The installation went smoothly and TTN says the gateway is connected and receiving and transmitting messages. The documentation says this about the green LED:
GREEN - blinking 1 sec - [GW Mode] WiFi STA not connected
GREEN - blinking 1/4 sec - [GW Mode] WiFi STA connected,establishing connection to LNS, configuring radio
GREEN - solid - [GW Mode] WiFi STA connected, GW connected to LNS, radio listening
Since I installed it, my gateway has been alternating between Green-solid and Green-blinking-1/4-sec. Itâs solid for about 55 seconds and then blinking for 10-20 seconds. The WiFi at the installation location is strong and Iâve also tried two other locations with good WiFi. My Internet connection seems stable.
Is this behavior normal? I wouldnât be too concerned except that I have a device that doesnât seem to be receiving messages. According to TTN it is succesfully activating but the device doesnât seem to think so. I also see pulses on the DI1 pin which the LMIC doc tells me is called RxTimeout and the device is acting as if its activations requests are timing out.
I have the same at the moment, however when its flashing its receiving data. There are some instabillity problems with the server side handling of TTIG according to HTDVisser.
Am curious to know if others are seeing the flashing green LED on their TTIG? Iâve been looking at mine (sitting on my desk next to my monitor) and it seems to be doing this 2 or 3 times a minute now. Iâm still seeing it pass traffic, but itâs difficult to know if there is a problem as I only have one edge device that reports every 15 minutes or so.
I have it too and Iâve tested that, when itâs flashing green, it still is able to receive data from a node.
However Iâm sure TTI is aware of this and we hope for an explanation / solution.
In response to the "flashing green LED " question:
Yes thatâs normal behavior.
If thereâs no traffic on your gateway for about 60s, the WebSocket(WS) connection to the network is dropped intentionally and the gateway will re-connect. During reconnection, the LED will flash green.
The reason for this to not have gateways actively connected to the network and taking up resources when thereâs no traffic (since WS requires a persistent connection).
Wouldnât it make sense to increase the WebSocket(WS) timeout to 5 or 10 minutes or to adjust it dynamically?
I noticed that it takes ~2 seconds when the packet was received by the TTIG till it starts a new WS connection and another second till the connection is established and the packet getâs send. If the packet is received by multiple gateways deduplication doesnât work anymore and the packet shows up as âretryâ in the TTN console. Also in conditions where rx packet frequency is between 1 to 10 minutes it might cause more load in the backend then leaving the session establishedâŚ
TTIG WS established â immediate transmit of the packet to TTN
07:12:43.703939 IP LorixOne.44329 > 52.169.76.203.1700: RADIUS, Access-Request (1), id: 0x83 length: 243
07:12:43.711171 IP IC880a-RPi.41703 > 52.169.76.203.1700: RADIUS, Access-Request (1), id: 0x79 length: 243
07:12:43.734337 IP TTIG.17829 > 52.169.76.203.443: Flags [P.], seq 848:1221, ack 1814, win 5840, length 373#
TTIG WS NOT established â 2 seconds till tcp connect:
07:13:45.816602 IP IC880a-RPi.41703 > 52.169.76.203.1700: RADIUS, Access-Request (1), id: 0x0a length: 243
07:13:45.818058 IP LorixOne.44329 > 52.169.76.203.1700: RADIUS, Access-Request (1), id: 0x18 length: 243
07:13:47.912911 IP TTIG.54858 > 52.169.76.203.443: Flags [S], seq 73142392, win 5840, options [mss 1460], length 0
Also to add, wouldnât the Downlink listen window on the device be missed because of the large time delay between Uplink transmit and when the TTN servers received it? Therefore, unless another active gateway is in the area, youâd never be able to get a Downlink packet to the device.
Have you tried it. I want to purchase it but worry that it might not have that capability of the 10km coverage. It could be a bit relieved if someone did manage to achieve the 10km.
However its an RF device like many others and coverage\range is very dependant on where it is located, for UHF communications in particular range is to a great extent determined by how high you can get the antenna, or in the case of TTIG, how high youi can get the entire device.
You might get more informative answers if you described where you are going to locate it and the surrounding environment. Someone may have used it in similar circumstances.
I thin k it could reach 10km only outdoors. 1st floor could be ok, but if around you you have a lot of buidings, it will not be sufficient.
Mine is just under the roof with a different antenna, and can reach 3km. In one single occasion I received signal from >10km.
Here is an example fo similar set up to what you describe from a pop-up test earlier in the year in Marlow on the River Thames here in UK. There was no point installing a big expensive outdoor system with high gain ant as location/range was likely constrained by the hills/terrain surrounding the river valley. TTIG behaved perfectly placed in a 1st floor window of a âfriendlyâ office block on the north side of the town. We were looking for 1.5-3km range depending on terrain and building clutter and TTIG more than met the needs.
Your mileage may vary depending on building construction, local clutter, whether glazing is âLow-Kâ thermal glass or other architectural glass with any of the various oxide/film layers used for colouring or termal reflectivity etc.
I will be testing at a know site with good elevation and wide field of view LoS for 10-20km range in a few weeks time and will post update here once completed. Note also, several folk seem to have modded units to add external ant which may also improve matters. Have not had time to field test one of my own modded TTIGâs yet due to other projectsâŚ
