wsdump3: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/wsdump3 - from package: python3-websocket

You may install the required package with command apt-get install {package}

Error in other languages:
wsdump3: bevel nie gevind nie
wsdump3: comandă negăsită
wsdump3: comando não encontrado
wsdump3: commande introuvable
wsdump3: command not found
wsdump3: käsku ei ole
wsdump3: không tìm thấy lệnh
wsdump3: komanda nerasta
wsdump3: Kommando nicht gefunden.
wsdump3: kommandot finns inte
wsdump3: komut yok
wsdump3: nie znaleziono polecenia
wsdump3: níor aimsíodh an t-ordú
wsdump3: no se encontró la orden
wsdump3: no s'ha trobat l'ordre
wsdump3: opdracht niet gevonden
wsdump3: parancs nem található
wsdump3: perintah tidak ditemukan
wsdump3: príkaz nenájdený
wsdump3: příkaz nenalezen
wsdump3: команда не найдена
wsdump3: командата не е открита
wsdump3: 命令找不到
wsdump3: コマンドが見つかりません