Server: Raspberry Pi4 running Blynk Server, Mosquitto MQTT, node-red, node-red-contrib-blynk-ws
Device: nodeMCU programmed with Arduino app using MQTT library.
nodeMCU programmed to send MQTT messages to broker.
node-red with blynk library takes the MQTT messages and sends them to Blynk server
node-red with blynk library takes messages from Blynk Server and sends to nodeMCU via MQTT
iPhone Blynk App successfully receives the data and displays ok - also button works to send message to switch LED on nodeMCU
So all seemed to be working OK – however there is no $home/Blynk/data folder so the Blynk charts in the app do not have any historic data.
(note I had previously successfully installed the Blynk server on another Pi and had it connected “directly” to the nodeMCU using the Blynk C library for the nodeMCU - in that case the Blynk/data folder was created for the project and the charts in the app worked ok)
Any ideas please why there is no $home/Blynk/data folder ??