Tests were made between the following units -

andy1 - Channel API
andy2 - Windows Zello 15.15.1
andy3 - Android
andy4 - Channel API

1. Speech

Originator	Platform Origin			Message Type/Destination 		Platform Dest	Result				Note
andy1		Windows/ChanAPI			speech - everyone				Windows			OK
andy1		Windows/ChanAPI			speech - everyone				Android			OK
andy1		Windows/ChanAPI			speech - everyone				Channel API		No data received
												
												
andy1		Windows/ChanAPI			speech - andy2					Windows			OK
andy1		Windows/ChanAPI			speech - andy3					Android			OK
andy1		Windows/ChanAPI			speech - andy4					Channel API		No data received

andy2		Windows/Zello			speech - everyone				Android			OK
andy2		Windows/Zello			speech - everyone				Channel API		No data received

andy3		Android					speech - everyone				Windows			OK
andy3		Android					speech - everyone				Android			OK
andy3		Android					speech - everyone				Channel API		No data received

2. Text

Originator	Platform Origin			Message Type/Destination 		Platform Dest	Result				Note
andy1		Windows/ChanAPI			text - everyone					Windows			OK
andy1		Windows/ChanAPI			text - everyone					Android			No data received
andy1		Windows/ChanAPI			text - everyone					Channel API		No data received

andy1		Windows/ChanAPI			text - andy2					Windows			OK

andy1		Windows/ChanAPI			text - andy3					Android			No data received	success true returned

andy1		Windows/ChanAPI			text - andy4					Channel API		No data received	success true returned

andy2		Windows/Zello			text - everyone					Android			No data received
andy2		Windows/Zello			text - everyone					Channel API		No data received

andy2		Windows/Zello			text - andy1					Channel API		No data received


3. Location

Originator	Platform Origin			Message Type/Destination 		Platform Dest	Result				Note
andy3		Android					location - everyone				Windows			OK
andy3		Android					location - everyone				Channel API		No data received

andy1		Windows/ChanAPI			location - everyone				Windows			OK
andy1		Windows/ChanAPI			location - everyone				Android			OK
andy1		Windows/ChanAPI			location - everyone				Channel API		No data received


Windows and Android have prescence information presentes, Channel API does not, you only get the number of users, not their name as below.

When Channel API logs on texting supported is shown as false - 

Start Element: json
Start Element: command
OnCharacters: "on_channel_status"
End Element: command
Start Element: channel
OnCharacters: "Everyone"
End Element: channel
Start Element: status
OnCharacters: "online"
End Element: status
Start Element: users_online
OnCharacters: 4
End Element: users_online
Start Element: images_supported
OnCharacters: true
End Element: images_supported
Start Element: texting_supported
OnCharacters: false
End Element: texting_supported
Start Element: locations_supported
OnCharacters: true
End Element: locations_supported
End Element: json