sdpscanner: 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 CentOS possible default full paths are:

/usr/bin/sdpscanner - from package: qt5-qtconnectivity
/usr/lib64/qt5/bin/sdpscanner - from package: qt5-qtconnectivity
/usr/lib/qt5/bin/sdpscanner - from package: qt5-qtconnectivity

You may install the required package with command yum install {package}

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