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Re: $15 serial to wifi module HLK-RM04

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What purpose do you have in mind for the modules?

A couple of points to raise

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Someone swapped out the firmware
[forum.openwrt.org]

Have you read the wiki about how this is done? The flash memory must be removed from the board and updated before re-soldering. Thats a pretty tricky job for most folks.

However that does not mean that the unit is useless. I have ordered a couple of dev boards from aliexpress to play around with this module. I will try and report back when I have had a chance to play. Strikes me that if you need wifi access to your printer there may be easier solutions than this one. All the control software that i have seen looks for a Com port. You would need to find a way to send the serial information via ip address.

The manual talks about the module having a transparent mode. This allows you to send serial data to the uart or rs232 interfaces. I have not yet worked out how that is done from the pc end other than it can use tcp/ip

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