ESP Web Tools WiFI Scan fails when there is an emoji in an SSID

[CDFER]

A user has reported that the WiFi Scan functionality cannot properely render SSIDs that have emoji (Chracters that are >1Byte)

Correct SSID should be: "Buzzybee 🐝 - IoT 🌏"

I had a look into it. Weirdly enough, I think the bug is in the high-level TypeScript web interface rather than the low-level C++ firmware I wrote. I use an open-source tool called ESP Web Tools, which seems to assume that each byte received over serial is a character (emoji tend to be around 4 bytes).

WiFi-Improv Library seems to not be the issue

The WiFi-Improv Library seems to be handling it all correctly here is what I get back over USB Serial:

SSID: 😎

49 4D 50 52 4F 56 01 04 0F 04 0D 04 F0 9F 98 8E 03 2D 33 38 03 59 45 53 4A

Break down:

• 49 4D 50 52 4F 56 = "IMPROV" header
• 01 = IMPROV_SERIAL_VERSION
• 04 = TYPE_RPC_RESPONSE
• 0F = response size (15 bytes)
• 04 = command
• 0D = total data length (13 bytes)
• 04 = SSID length (4 bytes)
• F0 9F 98 8E = 😎 emoji in UTF-8 (4 bytes)
• 03 = WiFi RSSI length (3 bytes)
• 2D 33 38 = "-38"
• 03 = YES length (3 bytes)
• 59 45 53 = "YES"
• 4A = checksum