tstcpsend: 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/tstcpsend - from package: opencaster

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

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