Blynk not connecting?

[PeteKnight]

Have you rebooted your router?

@ayhamo

then i updated my blynk library to 1.1.0,

Have you tried downgrading to 1.0.1 to eliminate that as a potential issue?

@ayhamo

Using aurdino Serial coomuncation with nodemcu esp8266

That sounds like a very unsatisfactory hardware arrangement. What is the Arduino doing that couldn’t be done by the NodeMCU?

Your problem is that your NodeMCU’s hardware serial port is being used for communication with the Arduino, and that is preventing you from using it for debugging the connection issue with the Blynk server. If you could see the Blynk debug messages they would almost certainly give you a clue about where the issue lies.

I’d do everything I could to eliminate the Arduino from the equation, and if that really isn’t possible then I’d connect the Arduino to a SoftwareSerial port on the NodeMCU, or create a SoftwareSerial port for debugging and use an FTDI adapter.

@ayhamo

notifications did not arrive ( for some reason reached the limit without sending any? )

The message you received was almost certainly that you’d reached your EVENT limit, not NOTIFICATION limit.
This will be because you haven’t set-up the notification correctly, and because you don’t have any way to prevent multiple events from being triggered for the same alarm situation. This would normally be done us8ng a flag variable.

Once you get connected again you should read this…

Events, Notifications and the use of "Flag" variables

Update 19th May 2022 - you’ll see references to a limit of one event per minute in this tutorial. It appears that this limit has now been removed. I’ve not yet tested this myself, and when I do I’ll update the tutorial to reflect my findings. I’m seeing quite a few posts from people who are finding it difficult to get notifications working in Blynk IoT, and who don’t understand how to use “flag” variables to limit the number of notifications that are sent for any given alert situation. I thoug…

Pete.