ESP32 loses blynk.cloud connection when phone wifi hotspot router switches from home wifi connection to mobile data

[PeteKnight]

My money is still on the mobile ISP blocking the Blynk protocol…

Vodacom South Africa 3G data connection, is blocking/dropping Blynk-cloud

Vodacom South Africa 3G data connection, is blocking Blynk-cloud (PSH flagged) TCP/IP login binary-payload packets when my NodeMCU attempts to connect via WIFI tethered smartphone. I have no Idea why they would block/drop these, all other types of data such as HTTP, MQTT seems to pass through without issue. After extensive testing and searching around, I tested using a SIM card from a IOT sim card provider based in Germany which issues global data-roaming sim card for M2M/IOT applications. I …

Pete.